Guernsey Weather Fox

Seven day Guernsey weather forecast for 29 December 2025

Monday

Weather

Some cloud likely around dawn and possible around dusk. Otherwise super-sunny for daylight hours, with ENE’ly winds increasing from light force 3 to moderate force 4 through the morning, and perhaps tickling fresh force 5 in the afternoon. Max temp 8°C, and feeling most comfortable at the north ends of the west-coast bays, and at the east ends of the south-coast bays. The night time will then be cloudy, with some showers likely by dawn. Minimum temperatures of 4-5°C.

Surf and the Water

Probably (not definitely) some 1-2 foot surf on the west coast. Small but very long period swell, meaning that the lulls will be very long but the sets will have a decent amount of push in them, and probably break much better on the reefs than on the sand. Low water will be at 7am and high water around 1pm (7.4m).

Tuesday

Weather

Cloudy through the vast majority, if not the entirety, of this day. Some of the cloud being thick enough to squeeze out a shower. Few and far between and by no means heavy, so there is a chance that some parishes may stay dry, particularly in the south of the Island. Temperatures will hold steady around 7°C and the winds will be moderate force 4 E’ly (perhaps briefly bresh F5 in the afternoon). It will gradually fall calm overnight though, allowing temperatures to fall to 4 or 5°C, but with consistent cloud cover, there shouldn’t be any risk of ground frost.

Surf and the Water

Once again, probably (but not definitely) some 1-2 foot surf on the west coast. Small but very long period swell, meaning that the lulls will be very long but the sets will have a decent amount of push in them, and probably break much better on the reefs than on the sand. Low water will be at 8:15am and high water around 2:30pm (7.5m).

NY’s Eve and NY’s Day

Weather

A couple of beautifully calm days, although there will be a covering of cloud that, with such light winds, will have no means of clearing away. Both days will have a shower risk. Again, nothing heavy, but the odd shower is likely on the morning of NY’s Eve and the afternoon of NY’s Day. The greatest likelihood of showers, however, will be overnight into Friday, when the might merge into persistent rain for a time.Daytime maxima 7 and 8°C respectively. Nightly minima 3 and 6°C respectively.

Surf and the Water

Cleaner and possibly larger (maybe 2-3 feet) surf on NY’s Eve, but likely no better than 1 foot and rather choppy on NY’s Day. Swimming conditions will be great all around the Island on NY’s Eve but best confined to the east coast NY’s Day. Tides will be low in the mid-mornings and high around dusk (7.8m NY’s Eve and 8.1m NY’s Day).

Friday and The Weekend

Weather

The shower risk of the previous days will gradually fade to nothing on Friday, but the sky will remain mostly cloudy and the wind will be almost non-existent. Saturday then promises some sunshine, as a light to moderate N’ly breeze develops. This will bring cooler air that will be conducive to shower development. By Saturday night, and then through Sunday, these showers will be on the heavy side, and they will most likely fall as hail. The max temps gradually sliding away… 8, 7 and 6°C respectively. Nightly min temps will be in very low single figures, meaning that ground frost will become increasingly likely.

Surf and the Water

The surf will likely be tiny or flat. Swim conditions will be best on the south coast. Tides will be low around lunchtime. High water will be all be in the dark, early morning and early evening.

The next forecast update will most likely be on New Year’s Day…

Previous Weather Fox Forecasts

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