Guernsey weather

Our guide to the weather in Guernsey during September

17

Average high

4

UV Index

78mm

Monthly rainfall

79%

Humidity

Guernsey is a beautiful Channel Island with plenty of scenic coastal walks, stunning beaches, and a unique culture to explore. September is a great time to visit, with mild temperatures and fewer crowds. We've looked at the most up-to-date weather data for Guernsey, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Guernsey weather in September.

What's the temperature like in Guernsey during September?

The temperature is extremely stable in September with average highs of 17℃ and lows just 2℃ lower at 15℃. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.

Does it rain in Guernsey during September?

On average, there will be 5 rainy days during the month, amounting to 78.2mm in total. That's broadly comparable with the amount of rain we see in England during the summer months, and would be considered dry. There's a small chance that you'll catch a thunderstorm during your trip.

Is it windy in Guernsey during September?

Expect moderate breeze becoming stronger at times during September, with occasional gusts up to 23mph. With moderate air temperatures, any breeze will feel cool.

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Weather in Guernsey

Our month-by-month guide to the weather and climate in Guernsey

9.6

Guernsey weather in

January
9.1

Guernsey weather in

February
9.8

Guernsey weather in

March
10.8

Guernsey weather in

April
12.5

Guernsey weather in

May
14.8

Guernsey weather in

June
16.9

Guernsey weather in

July
17.5

Guernsey weather in

August
17.0

Guernsey weather in

September
15.5

Guernsey weather in

October
13.0

Guernsey weather in

November
11.1

Guernsey weather in

December