Caernarfon (Gwynedd) weather

Headline:

Largely cloudy with drizzle in places. Brighter on Monday.

This Evening and Tonight:

Fairly cloudy in many places this evening and overnight with cloud still thick enough for some drizzle over the hills. Clearer spells developing at times overnight allowing for a touch of frost in places. Minimum temperature -1 °C.

Monday:

Monday will probably be a brighter day overall with sunny periods, especially in the west. Fairly light winds but feeling chilly after a cold start. A few showers arriving later. Maximum temperature 7 °C.

Outlook for Tuesday to Thursday:

Remaining generally dry to end 2025 with sunny periods at times. Widespread overnight frosts and patchy freezing fog. Perhaps breezier with scattered showers on New Year's Day. Feeling rather cold.

Cold northerly winds, initially across Scotland are now expected to become dominant across the whole UK in the first week of January. These will bring wintry showers (often of snow) to many coastlines (and areas just inland of these) that are exposed to onshore winds. Subtle day-to-day changes in wind direction from northeast to northwest will change the places most exposed to the showers, but many inland locations across central and southern areas will remain mostly dry but cold. There are likely to be some more coherent bands of rain, sleet and snow working south, and these may bring a risk of more prolonged wintry precipitation affecting some inland areas. Towards the second half of this period, slightly milder conditions will attempt to move in from the west.

Whilst confidence in details is low, by the start of this period the transition back to westerly winds bringing Atlantic weather systems into the UK is expected to be complete, with temperatures most likely recovering to around average. There is perhaps a weak signal for slowly evolving weather patterns to be more favoured than normal, such patterns increase the chances of frost and fog above normal by night.