Guernsey weather in September 2021

18
18°C max day temperature
6
6 hours of sunshine per day
13
13 days with some rainfall
13
13°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
63
63 mm of monthly rainfall
4
4 (Moderate) UV index
17
17°C sea temperature

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The September weather guide for Guernsey shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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How hot is it in Guernsey in September?

Daytime temperatures usually reach 18°C in St Peter Port, Guernsey in September, falling to 13°C at night.

How sunny is it in Guernsey in September?

There are normally 6 hours of bright sunshine each day in St Peter Port, Guernsey in September - that's 45% of daylight hours.

How warm is the sea around Guernsey in September?

The average sea temperature around St Peter Port, Guernsey in September is 17°C.

Does it rain in Guernsey in September?

There are usually 13 days with some rain in St Peter Port, Guernsey in September and the average monthly rainfall is 63mm.

Metric (°C / mm) | Imperial (°F / inches)

Guernsey sunrise & sunset times for September 2021

Browse the sunrise & sunset times for Guernsey in September 2021. Select a month to view Guernsey sunrise & sunset times for the next twelve months. The Guernsey sunrise & sunset times shown below are for St Peter Port.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec