Porth y Wylfa Weather Forecast, Isle of Anglesey

Today 17 May Wales

A cloudy and cool start for some but sunnier in western areas. Brightening up in the east of Wales with plenty of strong sunshine across all of Wales by this afternoon. Feeling warm with light winds. Maximum Temperature 21C.

Tonight 17 May Wales

Largely sunny and warm this evening, but quickly cooling down after dark under clear skies. Patchy cloud and mist may develop by the morning. Turning chilly with localised rural frost. Minimum Temperature 3C.

Sun 18 May Wales

Any early mist or patchy cloud soon clearing to leave another sunny day. It will feel warm in the light winds and strong sunshine with high UV levels. Maximum Temperature 22C.

Mon 19 May Wales

Mostly dry early next week but cloudier than of late with a few heavy, perhaps thundery showers possible on Monday and Tuesday. Dry and sunny again on Wednesday, staying warm.

Tue 20 May Wales

Mostly dry early next week but cloudier than of late with a few heavy, perhaps thundery showers possible on Monday and Tuesday. Dry and sunny again on Wednesday, staying warm.

Wed 21 May Wales

Mostly dry early next week but cloudier than of late with a few heavy, perhaps thundery showers possible on Monday and Tuesday. Dry and sunny again on Wednesday, staying warm.

Thu 22 May Wales

A generally dry and fine end to the working week with light winds and warm sunshine continuing across the United Kingdom. A few showers are possible, but the majority of places will be dry. Temperatures during this time are likely to continue to be above normal for the time of year. Into the bank holiday weekend and following week, a change in weather type is expected. More unsettled conditions are likely to develop, with weather systems moving in from the Atlantic. This will bring spells of rain to many areas, perhaps heavy at times, with a risk of strong winds in places. Drier and brighter intervals are likely between systems. Temperatures will probably be near normal or slightly above.

Fri 23 May Wales

A generally dry and fine end to the working week with light winds and warm sunshine continuing across the United Kingdom. A few showers are possible, but the majority of places will be dry. Temperatures during this time are likely to continue to be above normal for the time of year. Into the bank holiday weekend and following week, a change in weather type is expected. More unsettled conditions are likely to develop, with weather systems moving in from the Atlantic. This will bring spells of rain to many areas, perhaps heavy at times, with a risk of strong winds in places. Drier and brighter intervals are likely between systems. Temperatures will probably be near normal or slightly above.

Porth y Wylfa Weather Forecast

Today 17 May Wales

Tonight 17 May Wales

Sun 18 May Wales

Mon 19 May Wales

Tue 20 May Wales

Wed 21 May Wales

Thu 22 May Wales

Fri 23 May Wales

Temperature Forecast Met Office

Temperature Real-Time

Dublin Radar

National Satellite

National Synoptic

Porth y Wylfa Temperature Statistics

May Temperature

Valley (18km)

Lowest 10 January, 2025

Average 2025

Highest 12 May, 2025

Lowest 11 April, 2025

Average April

Highest 30 April, 2025

Lowest 6 May, 2025

Average May

Highest 12 May, 2025

Climate (2020–Present)

Valley (18km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025