Porth Trecastell Weather Forecast, Isle of Anglesey LL63 5

Today 16 Dec Wales

A bright and dry start for most, with some patchy cloud lingering at first. A largely settled day, with prolonged sunshine, though the odd light shower is possible in the west. A light breeze, with temperatures near average. Maximum Temperature 9C.

Tonight 16 Dec Wales

Remaining largely settled this evening, with clear skies and light winds allowing pockets of frost and fog to form. Turning milder and increasingly cloudy overnight with winds picking up from the west by dawn. Minimum Temperature 2C.

Wed 17 Dec Wales

A wet and windy day as a band of prolonged rain spreads eastwards, bringing heavy downpours. Coastal gales likely with travel disruption and localised flooding possible. Maximum Temperature 10C.

Thu 18 Dec Wales

Remaining unsettled on Thursday with further heavy and disruptive rain. Friday brings brighter and drier conditions, with occasional showers, before another rain band moves in on Saturday. Often breezy.

Fri 19 Dec Wales

Remaining unsettled on Thursday with further heavy and disruptive rain. Friday brings brighter and drier conditions, with occasional showers, before another rain band moves in on Saturday. Often breezy.

Sat 20 Dec Wales

Remaining unsettled on Thursday with further heavy and disruptive rain. Friday brings brighter and drier conditions, with occasional showers, before another rain band moves in on Saturday. Often breezy.

Sun 21 Dec Wales

Unsettled conditions are likely to continue at first, with low pressure probably centred somewhere to the southwest of the UK, whilst high pressure tries to nose in from the east across northern areas. This means a broadly easterly flow becoming established, whilst periods of rain or showers becoming increasingly confined to southern or southwestern parts. With time, high pressure is signalled to become rather more dominant with more in the way dry, settled weather anticipated. With this, temperatures will probably lower a little compared to recent weeks, closer to or perhaps a little below average for some. Overnight frost and fog or freezing fog could become more widespread, though any particularly cold conditions look unlikely at this stage.

Mon 22 Dec Wales

Unsettled conditions are likely to continue at first, with low pressure probably centred somewhere to the southwest of the UK, whilst high pressure tries to nose in from the east across northern areas. This means a broadly easterly flow becoming established, whilst periods of rain or showers becoming increasingly confined to southern or southwestern parts. With time, high pressure is signalled to become rather more dominant with more in the way dry, settled weather anticipated. With this, temperatures will probably lower a little compared to recent weeks, closer to or perhaps a little below average for some. Overnight frost and fog or freezing fog could become more widespread, though any particularly cold conditions look unlikely at this stage.

Porth Trecastell Weather Forecast

Today 16 Dec Wales

Tonight 16 Dec Wales

Wed 17 Dec Wales

Thu 18 Dec Wales

Fri 19 Dec Wales

Sat 20 Dec Wales

Sun 21 Dec Wales

Mon 22 Dec Wales

Temperature Forecast Met Office

Temperature Real-Time

Dublin Radar

National Satellite

National Synoptic

Porth Trecastell Temperature Statistics

December Temperature

Valley (5km)

Lowest 10 January, 2025

Average 2025

Highest 12 July, 2025

Lowest 21 November, 2025

Average November

Highest 6 November, 2025

Lowest 4 December, 2025

Average December

Highest 9 December, 2025

Climate (2020–Present)

Valley (5km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025