St-Athan (Vale of Glamorgan) weather

Headline:

Brightening up as the day progresses.

Today:

A cloudy and damp start, with patchy hill fog and some light rain or drizzle. Clouds slowly lifting and breaking by the afternoon to leave plenty of sunny spells, especially in the east. Rather blustery, but feeling warmer than Monday. Maximum temperature 15 °C.

Tonight:

A dry evening for most, with clear spells. Cloudier skies towards the coasts, with a little drizzle still possible. A few fog patches forming where skies remain clear overnight. Minimum temperature 3 °C.

Wednesday:

After a chilly start, a sunny day is expected for many. Morning cloud towards the coasts should lift and break to allow plenty of sunshine. Feeling warm, with light winds. Maximum temperature 20 °C.

Outlook for Thursday to Saturday:

Another warm and sunny day is expected on Thursday. Friday and Saturday should remain dry with sunny spells, though a little cooler. Chilly nights where skies remain clear. Light winds.

A transition to a more changeable and in places rather unsettled spell of weather looks to take place at the start of this period as Atlantic frontal zones cross the UK. These are likely to be most active in the north and somewhat weaker further south, closer to a ridge of high pressure extending northeast from the subtropical Atlantic. It is possible that we may see a briefly widely colder interlude with northerly winds during the final week of March, which would bring the potential for some snow, especially for northern areas. Widely strong winds could also develop around this time. By the end of March, high pressure may become rather more dominant with plenty of dry weather, but with some overnight fog and frost.

Blocked, or slowly evolving, weather patterns are favoured for late March into early April, with high pressure probably building to the north or northeast of the UK. Whilst confidence is low in how this will influence the weather across the UK, this tends to lead to a more prolonged period of a certain weather type, be it settled or unsettled. In any case, a reduction in Atlantic-dominated weather patterns is likely, although some wet weather remains possible at times, perhaps more especially in the south and east whilst northwestern areas tend to be drier than average. Temperatures will probably be close to average for the period as a whole, but there is an increased chance of some colder conditions developing for a time with a risk of frost.