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Porth Tywyn Mawr (Sandy Beach) (Isle of Anglesey) weather

Here are our top tips to keep you, your friends and family safe at the beach with links to Royal National Lifeboat Institution (RNLI) and Met Office advice.



Forecast days

Sunny changing to cloudy in the afternoon.
Beach safety today
Use caution in and out of the sea. Strong winds may blow you off course or affect your balance
  • • paddle boarding/kayaking not recommended at any level
  • • consider your abilities in all other activities, seek expert advice

Tide: Next high tide (4.7m) at

Sunrise iconSunrise:
Sunset iconSunset:
VH UV
L Pollution

    7 day forecast for Porth Tywyn Mawr (Sandy Beach)

    Today (3 July 2025)
    Time
    05:00
    06:00
    07:00
    08:00
    09:00
    10:00
    11:00
    12:00
    13:00
    14:00
    15:00
    16:00
    17:00
    18:00
    19:00
    20:00
    21:00
    22:00
    23:00
    Weather symbols Sunny intervals Sunny day Sunny day Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Cloudy Cloudy Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Partly cloudy night Partly cloudy night
    Chance of precipitation
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    10%
    10%
    20%
    30%
    20%
    10%
    <5%
    10%
    10%
    <5%
    <5%
    Temperature
    12°
    12°
    14°
    15°
    15°
    16°
    16°
    16°
    16°
    17°
    17°
    16°
    16°
    17°
    17°
    16°
    16°
    15°
    15°
    Feels like temperature (°C)
    10°
    11°
    13°
    13°
    14°
    14°
    14°
    14°
    14°
    14°
    14°
    13°
    13°
    14°
    14°
    14°
    14°
    14°
    14°
    Wind direction and speed
    WNW
    8
    WNW
    7
    W
    8
    W
    8
    WSW
    9
    WSW
    10
    SW
    11
    SW
    12
    SW
    14
    SSW
    14
    SSW
    15
    SSW
    15
    SSW
    15
    SW
    14
    SW
    14
    SW
    13
    SW
    11
    SW
    10
    SW
    8
    Wind gust (mph)
    16
    15
    15
    16
    16
    18
    21
    22
    23
    25
    27
    27
    26
    25
    23
    23
    21
    20
    19
    Visibility
    VG
    VG
    VG
    E
    E
    E
    E
    E
    E
    E
    E
    E
    E
    E
    E
    E
    E
    VG
    VG
    Humidity
    82%
    82%
    75%
    70%
    66%
    65%
    64%
    64%
    66%
    66%
    66%
    70%
    75%
    75%
    75%
    76%
    84%
    85%
    86%
    UV 1 1 1 2 3 5 6 7 8 7 6 4 3 2 1 1 1 - -
    Wind direction and speed
    8
    7
    8
    8
    9
    10
    11
    12
    14
    14
    15
    15
    15
    14
    14
    13
    11
    10
    8
    Height of waves offshore (m)
    0.4
    0.3
    0.3
    0.3
    0.3
    0.3
    0.3
    0.3
    0.3
    0.4
    0.4
    0.5
    0.5
    0.5
    0.5
    0.5
    0.4
    0.4
    0.3
    Period of waves offshore (s)
    4
    4
    4
    4
    4
    4
    4
    4
    3
    3
    4
    4
    4
    4
    4
    4
    4
    4
    3
    Direction of waves offshore
    Friday (4 July 2025)
    Time
    00:00
    01:00
    02:00
    03:00
    04:00
    05:00
    06:00
    07:00
    08:00
    09:00
    10:00
    11:00
    12:00
    13:00
    14:00
    15:00
    16:00
    17:00
    18:00
    19:00
    20:00
    21:00
    22:00
    23:00
    Weather symbols Clear night Clear night Clear night Clear night Clear night Sunny day Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Cloudy Cloudy Cloudy Light rain Light rain Light rain Light rain Light rain Light rain Light rain Overcast
    Chance of precipitation
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    10%
    30%
    50%
    60%
    60%
    70%
    70%
    70%
    70%
    50%
    50%
    Temperature (°C)
    15°
    14°
    14°
    14°
    13°
    13°
    14°
    15°
    15°
    16°
    16°
    16°
    17°
    17°
    17°
    16°
    16°
    16°
    16°
    16°
    15°
    15°
    15°
    15°
    Feels like temperature (°C)
    13°
    13°
    13°
    12°
    12°
    12°
    12°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    12°
    12°
    12°
    12°
    12°
    12°
    11°
    11°
    12°
    Wind direction and speed (mph)
    WSW
    8
    WSW
    8
    WSW
    8
    WSW
    8
    SW
    8
    SW
    8
    SW
    9
    SW
    11
    SW
    14
    SW
    15
    SW
    17
    SSW
    18
    SSW
    20
    SSW
    21
    SSW
    22
    SSW
    22
    SSW
    22
    SSW
    22
    SSW
    21
    SSW
    21
    SSW
    22
    SSW
    22
    SSW
    21
    SW
    20
    Wind gust (mph)
    18
    18
    18
    18
    18
    19
    21
    25
    28
    29
    31
    34
    36
    37
    39
    39
    40
    40
    40
    41
    40
    39
    39
    38
    Visibility (description)
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    E
    E
    E
    E
    E
    VG
    VG
    VG
    VG
    VG
    VG
    G
    M
    M
    M
    G
    Humidity
    85%
    84%
    83%
    85%
    86%
    86%
    85%
    78%
    75%
    74%
    72%
    72%
    74%
    74%
    76%
    77%
    80%
    84%
    86%
    88%
    89%
    91%
    91%
    92%
    UV - - - - 1 1 1 1 2 3 5 5 5 6 4 3 2 2 1 1 1 1 - -
    Wind direction and speed (mph)
    8
    8
    8
    8
    8
    8
    9
    11
    14
    15
    17
    18
    20
    21
    22
    22
    22
    22
    21
    21
    22
    22
    21
    20
    Height of waves offshore (m)
    0.3
    0.3
    0.4
    0.4
    0.4
    0.4
    0.4
    0.5
    0.5
    0.6
    0.5
    0.5
    0.5
    0.6
    0.6
    0.7
    0.8
    0.9
    0.9
    0.8
    0.8
    0.8
    0.8
    0.8
    Period of waves offshore (s)
    3
    3
    4
    4
    4
    4
    4
    4
    4
    4
    4
    4
    4
    3
    5
    5
    6
    6
    6
    6
    6
    6
    6
    4
    Direction of waves offshore
    Saturday (5 July 2025)
    Time
    00:00
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Overcast Overcast Overcast Overcast Overcast Overcast Sunny intervals Cloudy Overcast
    Chance of precipitation
    40%
    30%
    20%
    20%
    10%
    10%
    10%
    10%
    20%
    Temperature (°C)
    15°
    15°
    15°
    15°
    16°
    18°
    18°
    17°
    16°
    Feels like temperature (°C)
    12°
    12°
    12°
    13°
    14°
    16°
    16°
    15°
    15°
    Wind direction and speed (mph)
    SW
    20
    SW
    19
    SW
    17
    SW
    14
    SW
    13
    SW
    13
    SW
    13
    SW
    12
    W
    11
    Wind gust (mph)
    36
    35
    31
    26
    24
    23
    23
    23
    22
    Visibility (description)
    G
    G
    G
    VG
    VG
    VG
    VG
    VG
    VG
    Humidity
    92%
    93%
    96%
    96%
    91%
    82%
    79%
    83%
    85%
    UV - - 1 1 3 5 4 1 -
    Wind direction and speed (mph)
    20
    19
    17
    14
    13
    13
    13
    12
    11
    Height of waves offshore (m)
    0.8
    0.8
    0.8
    0.7
    0.6
    0.4
    0.7
    0.7
    0.6
    Period of waves offshore (s)
    4
    4
    7
    7
    4
    4
    4
    5
    4
    Direction of waves offshore
    Sunday (6 July 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Overcast Overcast Overcast Cloudy Cloudy Overcast Overcast Cloudy
    Chance of precipitation
    30%
    40%
    30%
    20%
    10%
    20%
    20%
    20%
    Temperature (°C)
    15°
    14°
    14°
    15°
    17°
    17°
    16°
    15°
    Feels like temperature (°C)
    13°
    12°
    12°
    13°
    14°
    15°
    15°
    13°
    Wind direction and speed (mph)
    W
    11
    WNW
    13
    WNW
    13
    WNW
    14
    WNW
    14
    WNW
    11
    WNW
    9
    NW
    8
    Wind gust (mph)
    25
    26
    26
    25
    22
    18
    17
    19
    Visibility (description)
    E
    E
    E
    E
    E
    E
    E
    E
    Humidity
    85%
    86%
    86%
    82%
    73%
    71%
    75%
    83%
    UV - - 1 4 7 4 1 -
    Wind direction and speed (mph)
    11
    13
    13
    14
    14
    11
    9
    8
    Height of waves offshore (m)
    0.6
    0.7
    0.7
    0.8
    1.0
    0.7
    0.5
    0.4
    Period of waves offshore (s)
    4
    5
    6
    5
    5
    5
    4
    4
    Direction of waves offshore
    Monday (7 July 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Cloudy Sunny intervals Sunny intervals Sunny intervals Sunny day Sunny day Sunny day Clear night
    Chance of precipitation
    20%
    30%
    20%
    10%
    10%
    <5%
    <5%
    <5%
    Temperature (°C)
    14°
    13°
    14°
    15°
    17°
    18°
    17°
    14°
    Feels like temperature (°C)
    12°
    11°
    11°
    13°
    14°
    15°
    15°
    13°
    Wind direction and speed (mph)
    NW
    10
    NW
    12
    NW
    13
    NW
    15
    NW
    14
    NW
    12
    NW
    11
    NW
    8
    Wind gust (mph)
    21
    23
    26
    25
    24
    22
    17
    10
    Visibility (description)
    E
    E
    VG
    E
    E
    VG
    VG
    VG
    Humidity
    81%
    84%
    80%
    73%
    65%
    60%
    65%
    83%
    UV - - 1 5 7 5 1 -
    Wind direction and speed (mph)
    10
    12
    13
    15
    14
    12
    11
    8
    Height of waves offshore (m)
    0.4
    0.7
    1.1
    1.2
    1.3
    1.1
    0.9
    0.8
    Period of waves offshore (s)
    5
    5
    5
    5
    6
    6
    6
    6
    Direction of waves offshore
    Tuesday (8 July 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Partly cloudy night Sunny intervals Sunny intervals Sunny intervals Sunny day Sunny day Sunny intervals Partly cloudy night
    Chance of precipitation
    <5%
    10%
    10%
    10%
    <5%
    <5%
    <5%
    10%
    Temperature (°C)
    13°
    12°
    14°
    17°
    18°
    19°
    18°
    15°
    Feels like temperature (°C)
    11°
    11°
    13°
    15°
    16°
    17°
    17°
    14°
    Wind direction and speed (mph)
    NW
    7
    NW
    7
    WNW
    7
    W
    9
    WSW
    10
    SW
    10
    SW
    9
    SSW
    7
    Wind gust (mph)
    8
    11
    15
    20
    21
    19
    15
    12
    Visibility (description)
    G
    G
    VG
    VG
    VG
    VG
    VG
    VG
    Humidity
    90%
    92%
    86%
    71%
    65%
    65%
    68%
    87%
    UV - - 1 4 7 4 1 -
    Wind direction and speed (mph)
    7
    7
    7
    9
    10
    10
    9
    7
    Height of waves offshore (m)
    0.7
    Period of waves offshore (s)
    5
    Direction of waves offshore
    Wednesday (9 July 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Partly cloudy night Overcast Cloudy Sunny intervals Sunny intervals Sunny day Sunny intervals Partly cloudy night
    Chance of precipitation
    10%
    10%
    10%
    10%
    <5%
    <5%
    <5%
    <5%
    Temperature (°C)
    15°
    15°
    15°
    18°
    20°
    20°
    19°
    16°
    Feels like temperature (°C)
    14°
    14°
    15°
    17°
    18°
    18°
    18°
    16°
    Wind direction and speed (mph)
    SW
    6
    SW
    6
    WSW
    6
    WSW
    9
    SW
    11
    SW
    11
    SSW
    10
    SSW
    8
    Wind gust (mph)
    10
    10
    16
    17
    20
    19
    17
    13
    Visibility (description)
    G
    G
    G
    VG
    VG
    VG
    VG
    VG
    Humidity
    93%
    94%
    90%
    81%
    72%
    69%
    75%
    90%
    UV - - 1 4 7 4 1 -
    Wind direction and speed (mph)
    6
    Height of waves offshore (m)
    Period of waves offshore (s)
    Direction of waves offshore

    Tide times

    Thursday 3 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Thursday 3 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Thursday 3 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Thursday 3 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Friday 4 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Friday 4 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Friday 4 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Friday 4 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Saturday 5 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Saturday 5 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Saturday 5 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Saturday 5 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Sunday 6 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Sunday 6 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Sunday 6 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Sunday 6 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Monday 7 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Monday 7 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Monday 7 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Monday 7 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Tuesday 8 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Tuesday 8 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Tuesday 8 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Tuesday 8 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Wednesday 9 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Wednesday 9 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Wednesday 9 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Tide times

    Wednesday 9 July

    Tide times and heights are from Holyhead tidal station which is 2.3 miles away. So times may be different at this beach. What does this mean?

    Contains ADMIRALTY® tidal data: © Crown Copyright and database right.

    Porth Tywyn Mawr (Sandy Beach) weather map

    View the weather with our interactive map

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    Wales weather forecast

    Headline:

    Mainly dry with plenty of sunny spells.

    Today:

    A bright and sunny start with cloud gradually bubbling up through the day. Feeling warm in the sunshine, though the occasional shower is possible through the afternoon, mainly in the north. Winds generally remaining light. Maximum temperature 21 °C.

    Tonight:

    Any showers soon fading away to leave a dry night with widely clear skies. Some mist developing across the mountains under light winds. Feeling fresh. Minimum temperature 8 °C.

    Friday:

    Some early sunshine, before turning increasingly cloudy through the day. Mostly dry, though spells of rain spreading into northern parts later, and becoming breezy here too. Maximum temperature 22 °C.

    Outlook for Saturday to Monday:

    Breezier and cloudier over the weekend, with periods of persistent rain through Saturday and scattered showers likely on Sunday and Monday. Feeling cooler too, especially by Monday.

    Updated:

    UK long range weather forecast

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