Guernsey Weather & Climate 2026

Csb Warm-Summer Mediterranean

Monthly climate averages for St. Peter Port. Based on 10-year ERA5 reanalysis data.

January February March April May June July August September October November December

Climate Overview

Guernsey experiences average highs of 13°C (55°F) and lows of 12°C (54°F) throughout the year. Rainfall is moderate, averaging about 12 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have stayed broadly stable across the available records.

Drier season: Apr–Sep Wetter season: Jan–Dec

At-a-Glance Climate Summary

Jan 1/10 Feb 1.4/10 Mar 2.4/10 Apr 5/10 May 5.2/10 Jun 7.4/10 Jul 7.5/10 Aug 7.6/10 Sep 6.4/10 Oct 5.6/10 Nov 2.9/10 Dec 1/10

Key figures

Climate Score
4.5/10
Best: June, July, August, September
UV Index
—
Low
Temperature 13°C / 12°C
Feels Like 10°C / 7°C
Rainy Days 12
Rainfall 80 mm
Sunshine 9 h
Humidity 82%
Wind Speed 37 km/h
Dew Point 9°C
Snow Days 1 days
Best Time to Visit
J F M A M J J A S O N D
Recommended
Hottest Month
18°C
August
Avg Low 17°C
Rain 8 days
Coldest Month
8°C
January
Avg High 10°C
Rain 17 days
Driest Month
7 days
July
Avg High 17°C
Avg Low 16°C
Windiest Month
45 km/h
December (Gusts 63)

Worst Time to Visit

Consider avoiding January, February, March, December due to heavy rainfall.

LIVE Current Weather Local Time
LIVE Air Quality
Sun Position
Sunrise 04:03
Daylight 16.3h
Sunset 20:18

Showing the live 14-day forecast for Saint Peter Port, not a single forecast for all of Guernsey.

14-Day Forecast

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City forecasts

14-day forecasts for major cities in Guernsey

Weather changes by city, coast, elevation, and region. Use these live previews for populated places in Guernsey, then open a city page for the full forecast.

Saint Peter Port

Population: 16.5K

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Vale Parish

Population: 9.6K

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Saint Sampson

Population: 9K

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Saint Pierre du Bois Parish

Population: 2K

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Forest Parish

Population: 1.6K

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Sark

Population: 600

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Seasonal Breakdown

Spring
Mar–May
Avg High 11°C
Avg Low 10°C
Rain 10 days/mo
Summer
Jun–Aug
Avg High 17°C
Avg Low 15°C
Rain 8 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 16°C
Avg Low 14°C
Rain 15 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 10°C
Avg Low 8°C
Rain 17 days/mo

Based on historical averages (2016–2025)

Monthly Temperatures

24°C 18°C 12°C 6°C 0°C JanFebMarAprMayJunJulAugSepOctNovDec
High Low Shaded bands show the typical range across the available yearly records.

Monthly Rainfall

0 mm 26 mm 52 mm 78 mm 104 mm 130 mm JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall

Monthly Humidity

0% 25% 50% 75% 100% JanFebMarAprMayJunJulAugSepOctNovDec
Humidity

Monthly Wind Speed

0 20 40 60 80 JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed Gusts

Sunshine

0 3 6 9 12 15 JanFebMarAprMayJunJulAugSepOctNovDec
Sunshine

Monthly Daylight Hours

18h 16h 14h 12h 10h 8h JanFebMarAprMayJunJulAugSepOctNovDec
Daylight 12h reference

Monthly Dew Point & Comfort

28°C 24°C 20°C 16°C 12°C 8°C 4°C 0°C -4°C JanFebMarAprMayJunJulAugSepOctNovDec
Dew Point Dry Comfortable Humid Muggy Oppressive

Snow Days

0 1 2 3 4 JanFebMarAprMayJunJulAugSepOctNovDec
Snow Days Snowfall

Month-by-Month Weather Table

January
Poor
Temp
10°C / 8°C
Feels Like
5°C / 1°C
Rain
17days (120 mm) Wet
Sun
4.6h Fair
Humidity
78% Humid
View Details
February
Poor
Temp
10°C / 8°C
Feels Like
5°C / 1°C
Rain
14days (75 mm) Wet
Sun
5.9h Fair
Humidity
80% Humid
Snow Days
1days
View Details
March
Poor
Temp
10°C / 8°C
Feels Like
6°C / 2°C
Rain
13days (61 mm) Wet
Sun
8.5h Good
Humidity
80% Humid
View Details
April
Fair
Temp
11°C / 9°C
Feels Like
7°C / 4°C
Rain
8days (37 mm) Wet
Sun
11.4h Excellent
Humidity
80% Humid
View Details
May
Fair
Temp
13°C / 11°C
Feels Like
10°C / 7°C
Rain
8days (39 mm) Wet
Sun
12.7h Excellent
Humidity
84% Humid
View Details
June best
Good
Temp
15°C / 14°C
Feels Like
14°C / 11°C
Rain
8days (54 mm) Wet
Sun
13.1h Excellent
Humidity
87% Very Muggy
View Details
July best
Excellent
Temp
17°C / 16°C
Feels Like
16°C / 13°C
Rain
7days (36 mm) Good
Sun
12.8h Excellent
Humidity
86% Very Muggy
View Details
August best
Excellent
Temp
18°C / 17°C
Feels Like
17°C / 14°C
Rain
8days (41 mm) Wet
Sun
11.8h Excellent
Humidity
85% Humid
View Details
September best
Fair
Temp
17°C / 16°C
Feels Like
16°C / 13°C
Rain
11days (81 mm) Wet
Sun
10.1h Excellent
Humidity
81% Humid
View Details
October
Fair
Temp
16°C / 14°C
Feels Like
13°C / 9°C
Rain
16days (135 mm) Wet
Sun
7.5h Good
Humidity
80% Humid
View Details
November
Poor
Temp
13°C / 11°C
Feels Like
9°C / 5°C
Rain
17days (130 mm) Wet
Sun
5.6h Fair
Humidity
78% Humid
View Details
December
Wet
Temp
11°C / 9°C
Feels Like
6°C / 3°C
Rain
19days (147 mm) Wet
Sun
4.2h Fair
Humidity
79% Humid
View Details
Month Temp Feels Like Rain Sun Humidity Status
January 10°C / 8°C 5°C / 1°C 17days (120 mm) Wet 4.6h Fair 78% Humid Poor View Details
February 10°C / 8°C 5°C / 1°C 14days (75 mm) Wet 5.9h Fair 80% Humid Poor View Details
March 10°C / 8°C 6°C / 2°C 13days (61 mm) Wet 8.5h Good 80% Humid Poor View Details
April 11°C / 9°C 7°C / 4°C 8days (37 mm) Wet 11.4h Excellent 80% Humid Fair View Details
May 13°C / 11°C 10°C / 7°C 8days (39 mm) Wet 12.7h Excellent 84% Humid Fair View Details
June best 15°C / 14°C 14°C / 11°C 8days (54 mm) Wet 13.1h Excellent 87% Very Muggy Good View Details
July best 17°C / 16°C 16°C / 13°C 7days (36 mm) Good 12.8h Excellent 86% Very Muggy Excellent View Details
August best 18°C / 17°C 17°C / 14°C 8days (41 mm) Wet 11.8h Excellent 85% Humid Excellent View Details
September best 17°C / 16°C 16°C / 13°C 11days (81 mm) Wet 10.1h Excellent 81% Humid Fair View Details
October 16°C / 14°C 13°C / 9°C 16days (135 mm) Wet 7.5h Good 80% Humid Fair View Details
November 13°C / 11°C 9°C / 5°C 17days (130 mm) Wet 5.6h Fair 78% Humid Poor View Details
December 11°C / 9°C 6°C / 3°C 19days (147 mm) Wet 4.2h Fair 79% Humid Wet View Details

Best Time to Visit Guernsey (2026)

Frequently Asked Questions

The best months to visit Guernsey are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for St. Peter Port, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Guernsey is August, with average daytime highs of 18°C (64°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Guernsey is January, with average overnight lows of 8°C (46°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Guernsey is December, averaging 147mm of precipitation across 19 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Guernsey runs through December, January, November, October, with the heaviest rainfall in December. Based on 10-year averages for St. Peter Port.
Guernsey receives approximately 108 sunshine hours per year. The sunniest month is June with around 13 hours. Based on climate data for St. Peter Port.
The least favorable months to visit Guernsey are January, February, March, December, primarily due to heavy rainfall. For the best conditions, consider June, July, August, September instead.
Average humidity in Guernsey is 82%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Yes, Guernsey receives snow. Months with snowfall average 1 snow days and 0 cm (0 in) of accumulation, with about 0 frost days during winter.
Average wind speeds in Guernsey are 37 km/h (23 mph). The windiest month is December with peak winds reaching 45 km/h (28 mph) (gusts up to 63 km/h / 39 mph).
Guernsey averages 2 clear-sky days per month with overall cloud cover around 64%. The clearest skies occur in April.
The annual average dew point in Guernsey is 9°C (48°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Guernsey has a Warm-Summer Mediterranean climate, classified as Csb under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Guernsey ranges from 7°C (45°F) to 10°C (50°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Guernsey. It earns a climate score of 7.4/10 with Good.
For June in Guernsey, pack Layered clothing, Light jacket, Umbrella, Windbreaker, Comfortable walking shoes. With average highs of 15°C (59°F) and 8 rainy days, these essentials will keep you comfortable.

Data Source

Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.

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