Guernsey weather live forecast

Today's maximum temperature in Guernsey is expected to be 18°C. Select a day from the live weather forecast for Guernsey (St Peter Port) for more weather parameters.

Thursday
17th Sep
18

15

3

3
Friday
18th Sep
18

15

3

3
Saturday
19th Sep
20

16

5

4
Sunday
20th Sep
19

16

1

4
Monday
21st Sep
20

15

6

4

5-day weather forecast updated at 04:00 on Thursday 17th September 2026 GMT

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Destination

The 5-day weather forecast for Guernsey, represented by St Peter Port, (St Peter Port) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Guernsey weather forecast by day

Below are the detailed weather forecasts for Guernsey for the next 5 days. The forecasts shown are for St Peter Port and may not represent the whole of Guernsey. Browse more destinations in Guernsey to view more weather forecasts.

Guernsey weather for Thursday 17th September 2026

Expect mostly cloudy with light rain in Guernsey with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 63% chance of some rain and a fresh breeze of 31 kph from the west.

18
°C maximum temperature
15
°C minimum temperature
mostly cloudy with light rain
3
hours of sunshine
3
UV index (Moderate)
63
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
31
kph wind from W

Guernsey weather for Friday 18th September 2026

Expect broken clouds in Guernsey with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the west.

18
°C maximum temperature
15
°C minimum temperature
broken clouds
3
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
18
°C wind chill
28
kph wind from W

Guernsey weather for Saturday 19th September 2026

Expect broken clouds in Guernsey with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 27 kph from the south-west.

20
°C maximum temperature
16
°C minimum temperature
broken clouds
5
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
20
°C wind chill
27
kph wind from SW

Guernsey weather for Sunday 20th September 2026

Expect broken clouds in Guernsey with a maximum temperature of 19°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the west.

19
°C maximum temperature
16
°C minimum temperature
broken clouds
1
hour of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
23
kph wind from W

Guernsey weather for Monday 21st September 2026

Expect broken clouds in Guernsey with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north-east.