Oystermouth Weather Forecast, Swansea SA3 4

Today 17 Dec Wales

A dull and damp day as a band of rain pushes eastwards, bringing widespread and prolonged heavy downpours, accompanied by strong winds and potentially coastal gales. Travel disruption and localised flooding possible. Conditions worst felt in the south and west. Maximum Temperature 10C.

Tonight 17 Dec Wales

It will be a cloudy, wet and windy evening with some heavy bursts of rain at times. Overnight, drier weather will arrive from the west with some clear spells, and the strong wind will ease somewhat. Staying frost-free. Minimum Temperature 7C.

Thu 18 Dec Wales

Thursday will start fine. However, cloud will thicken with very wet and potentially very windy weather developing by lunchtime. Turning more showery and less blustery from the west later. Maximum Temperature 12C.

Fri 19 Dec Wales

Friday will be a brighter, though still breezy day with sunshine and scattered showers. Windier on Saturday, with further rain arriving, then cloudy and damp, though less windy on Sunday.

Sat 20 Dec Wales

Friday will be a brighter, though still breezy day with sunshine and scattered showers. Windier on Saturday, with further rain arriving, then cloudy and damp, though less windy on Sunday.

Sun 21 Dec Wales

Friday will be a brighter, though still breezy day with sunshine and scattered showers. Windier on Saturday, with further rain arriving, then cloudy and damp, though less windy on Sunday.

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 becomes established to the northeast. This means a broadly easterly flow will become increasingly dominant through next week, whilst periods of rain or showers become increasingly confined to southern or southwestern parts. With time, high pressure is signaled to become more dominant with more in the way of dry, settled weather anticipated though there could be some isolated showers to eastern parts, that could perhaps be wintry at times. Temperatures will lower compared to recent weeks, closer to or perhaps a little below average for many. Overnight frost and fog or freezing fog could become more prevalent, though any particularly cold conditions look unlikely at this stage.

Tue 23 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 becomes established to the northeast. This means a broadly easterly flow will become increasingly dominant through next week, whilst periods of rain or showers become increasingly confined to southern or southwestern parts. With time, high pressure is signaled to become more dominant with more in the way of dry, settled weather anticipated though there could be some isolated showers to eastern parts, that could perhaps be wintry at times. Temperatures will lower compared to recent weeks, closer to or perhaps a little below average for many. Overnight frost and fog or freezing fog could become more prevalent, though any particularly cold conditions look unlikely at this stage.

Oystermouth Weather Forecast

Today 17 Dec Wales

Tonight 17 Dec Wales

Thu 18 Dec Wales

Fri 19 Dec Wales

Sat 20 Dec Wales

Sun 21 Dec Wales

Mon 22 Dec Wales

Tue 23 Dec Wales

Temperature Forecast Met Office

Temperature Real-Time

Crug-y-Gorllwyn (Carmarthenshire) Radar

National Satellite

National Synoptic

Oystermouth Temperature Statistics

December Temperature

Pembrey Sands Samos (29km)

Lowest 4 March, 2025

Average 2025

Highest 12 August, 2025

Lowest 21 November, 2025

Average November

Highest 5 November, 2025

Lowest 4 December, 2025

Average December

Highest 9 December, 2025

Climate (2020–Present)

Pembrey Sands Samos (29km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025