Climate Insights for Alderney Airport

The climate in Alderney Airport is temperate. The average annual temperature is 12°C and approximately 1014mm of precipitation falls per year. December is the wettest month, receiving around 149mm of rainfall. Alderney 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, March, January, when temperatures can drop to 8°C.

Alderney 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.

Alderney Airport is a moderately rainy area, receiving approximately 1014mm of precipitation annually, which averages out to around 85mm per month. The wettest month is December, averaging 149mm of rainfall. November and October also tend to see above-average precipitation. The driest month is July, with just 29mm. That's 120mm less than December, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Alderney Airport is relatively calm, with an average annual wind speed of 8km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 10km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/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 9km/h in winter, 7km/h in spring, 6km/h in summer, 8km/h in autumn.

It is currently summer in Alderney Airport, which began on June 21, 2026. Alderney 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. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Alderney 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 51mm 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 Alderney 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.