Climate Insights for Calais

The climate in Calais is cool. The average annual temperature is 7°C and approximately 1170mm of precipitation falls per year. Calais receives a notable amount of rainfall throughout the year, including during its driest month. Calais is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Luglio, Agosto, Giugno. The coldest months are Febbraio, Gennaio, Dicembre, when temperatures can drop to -10°C. Snowfall occurs from January to December, with around 163cm accumulating over the season.

Calais has a wide annual temperature range, spanning 36°C from the coldest to warmest months. The warmest month is Luglio, when average highs reach 26°C and the mean temperature sits around 20°C. The coldest month is Febbraio, when overnight lows fall to -10°C and the daily average is -6°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Calais is a moderately rainy area, receiving approximately 1170mm of precipitation annually, which averages out to around 97mm per month. The wettest month is December, averaging 125mm of rainfall. January and October also tend to see above-average precipitation. The driest month is May, with just 83mm. That's 42mm less than December, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Snowfall is a regular feature from January to December, with around 163cm accumulating over the season. January typically sees the most snow at around 39cm.

Calais is mildly breezy, with an average annual wind speed of 18km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 20km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 15km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h 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 19km/h in winter, 19km/h in spring, 16km/h in summer, 17km/h in autumn.

It is currently spring in Calais, which began on March 20, 2026. Calais 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 Luglio at around 26°C, while the coldest stretch bottoms out in Febbraio near -10°C. Summer is next, beginning on June 21, 2026 — 92 days from now.

The best time to visit Calais is during Giugno, Luglio, Agosto and Settembre, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 90mm per month. By contrast, Febbraio can be quite cold with temperatures dropping to -10°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Calais 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. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. 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.