Climate Insights for Guernsey Airport

The climate in Guernsey Airport is temperate. The average annual temperature is 13°C and approximately 932mm of precipitation falls per year. Guernsey Airport receives a notable amount of rainfall throughout the year, including during its driest month. Guernsey Airport is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, September, July. The coldest months are February, January, March, when temperatures can drop to 8°C.

Guernsey Airport has relatively stable temperatures year-round, staying within a 10°C range. August is the warmest month, though highs remain moderate at 18°C with a mean of 17°C. February is the coolest month, with minimum temperatures around 8°C and an average of 9°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows. The sharpest temperature change occurs between October and November, with a 3°C shift in average temperatures.

Guernsey Airport is a moderately rainy area, receiving approximately 932mm of precipitation annually, which averages out to around 78mm per month. The wettest month is November, averaging 134mm of rainfall. December and January also tend to see above-average precipitation. The driest month is July, with just 36mm. That's 98mm less than November, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Guernsey Airport is very windy, with an average annual wind speed of 36km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 44km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in June, with average winds dropping to 29km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 15km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 43km/h in winter, 34km/h in spring, 29km/h in summer, 38km/h in autumn.

It is currently spring in Guernsey Airport, which began on March 20, 2026. Guernsey Airport is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 18°C, while the coldest stretch bottoms out in February near 8°C. Summer is next, beginning on June 21, 2026 — 90 days from now.

The best time to visit Guernsey Airport is during July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 54mm per month. By contrast, February can be quite cold with temperatures dropping to 8°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Guernsey Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.