Climate Insights for Chartres

The climate in Chartres is temperate. The average annual temperature is 12°C and approximately 729mm of precipitation falls per year. May is the wettest month, receiving around 82mm of rainfall. Chartres is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are February, January, December, when temperatures can drop to 2°C. Light snow can occur between January and February.

Temperatures in Chartres vary considerably across the year, with a 24°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 26°C and the mean temperature sits around 21°C. February is the coolest month, with minimum temperatures around 2°C and an average of 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 5°C shift in average temperatures.

Chartres is a relatively dry area, receiving approximately 729mm of precipitation annually, which averages out to around 61mm per month. The wettest month is May, averaging 82mm of rainfall. December and March also tend to see above-average precipitation. The driest month is July, with just 27mm. That's 56mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Light snowfall can occur between January and February, totalling around 12cm annually. February is the snowiest month with approximately 6cm.

Chartres is relatively calm, with an average annual wind speed of 4km/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 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently summer in Chartres, which began on June 21, 2026. Chartres 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 July at around 26°C, while the coldest stretch bottoms out in February near 2°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit Chartres is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 45mm per month. By contrast, February can be quite cold with temperatures dropping to 2°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 Chartres 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.