Climate Insights for Lannion

The climate in Lannion is temperate. The average annual temperature is 12°C and approximately 981mm of precipitation falls per year. Lannion receives a notable amount of rainfall throughout the year, including during its driest month. Lannion is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, January, March, when temperatures can drop to 6°C.

Lannion sees moderate temperature variation throughout the year, ranging from 6°C to 19°C. August is the warmest month, though highs remain moderate at 19°C with a mean of 17°C. February is the coolest month, with minimum temperatures around 6°C and an average of 8°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between October and November, with a 3°C shift in average temperatures.

Lannion is a moderately rainy area, receiving approximately 981mm of precipitation annually, which averages out to around 82mm per month. The wettest month is December, averaging 128mm of rainfall. October and January also tend to see above-average precipitation. The driest month is July, with just 34mm. That's 94mm less than December, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Lannion is relatively calm, with an average annual wind speed of 5km/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 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/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 7km/h in winter, 5km/h in spring, 4km/h in summer, 6km/h in autumn.

It is currently summer in Lannion, which began on June 21, 2026. Lannion 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 19°C, while the coldest stretch bottoms out in February near 6°C. Autumn is next, beginning on September 23, 2026 — 91 days from now.

The best time to visit Lannion is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 54mm per month. By contrast, February can be quite cold with temperatures dropping to 6°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 Lannion 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.