Guernsey Weather Fox

Seven day Guernsey weather forecast for 21 November 2025

Saturday

Weather

Rain from very soon after dawn, until roughly 7 or 8pm. Some of it will be heavy, so puddles will be big by the end of the day. Winds will be very strong too, S’ly force 6 by mid-morning, perhaps touching strong force 7 around lunchtime, then veering to a gentler W’ly in the evening, when the rain clears eastwards. Sure this won’t feel very pleasant, but at lest the air will be much milder than it has been all week, with an expected daytime max of 11-12°C, followed by an overnight min of about 8°C.

Surf and the Water

The surf will gradually increase from about 1 foot at dawn to 2-3 feet by dusk. All of it clean, but difficult to manage with the strength of the wind. Good for windsurfing and kitesurfing though. High tide wil be 8.7m at 7:20am. Low tide will be at 1:40pm.

Sunday

Weather

Very windy again, this time the direction will be W’ly… the air feeling just as mild but with some decent shelter on the east coast it should actually feel quite pleasant there when it is dry. The rainfall on Sunday will be more showery than on Saturday, with a few dry interludes in the morning and then mostly dry in the afternoon, when we might even be treated to a little sunshine. Max temp 12°C in most places but possibly 13°C in Town.  

Surf and the Water

The surf will gradually increase from about 3 feet at dawn to about 5 feet by dusk, but it will all be very messy. Good for windsurfing and kitesurfing out west though. And good for swimming sheltered eastern spots like Fermain. High tide wil be 8.6m at 7:50am. Low tide will be at 2:10pm.

Monday and Tuesday

Weather

Strong force 6 NW’ly winds on Monday, gradually relaxing to light force 3 N’ly breezes through Tueday. The airflow will gradually cool through these changes, but the sky will become increasingly sunny, so the general perception will be one of significant improvement. Max temps 11°C and 10°C respectively, but Tuesday probably feeling warmer (especially in the south) due to the lack of windchill.

Surf and the Water

Monday’s surf will be messy throughout, gradually decreasing from about 6 feet at dawn to 4 feet by dusk. Then Tuesday’s surf will reduce from 3 feet to just 1-2 feet, but it will be increasingly clean. Tides will be high around breakfast time (8.3m on Monday and 8m on Tuesday). Low tides will be in the mid-afternoons.

Wednesday to Friday

Despite the improving trend of Tuesday, we will descend back into an unsettled regime through the rest of the week… Wedneday looking like a relatively gentle SSW’ly wind with ever thickening cloud, followed by stronger winds and rain through Wednesday night and then frequent showers on Thursday. Friday then looks likely to be very wet indeed, as a flabby low pressure pressure system sits directly overhead. The details at this end of the forecast are all a bit uncertain and changeable, but I think we can be pretty sure that it’s going to be wet. Daily max temps likely around 13°C

Weather

Surf and the Water

Wind detail is uncertain, but it currently looks as though most of it will be semi-clean with Wedneday and Friday possibly being very clean. Some decent groundswell likely from quite a deep low pressure system in the North Atlantic, but it’s uncertain whether we are talking about something that’s medium-small or medium-large. High tides will be in the mid to late mornings. Low tides will be in the mid to late afternoons.

The next forecast update will be on Sunday or Monday…

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