Climate Insights for Cornillon

The climate in Cornillon is hot. The average annual temperature is 25°C and approximately 658mm of precipitation falls per year. October is the wettest month, receiving around 97mm of rainfall. Cornillon 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 January, February, December, when temperatures can drop to 18°C.

Cornillon sees moderate temperature variation throughout the year, ranging from 18°C to 32°C. The warmest month is July, when average highs reach 32°C and the mean temperature sits around 27°C. January is the coolest month, with minimum temperatures around 18°C and an average of 23°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs.

Cornillon is a relatively dry area, receiving approximately 658mm of precipitation annually, which averages out to around 55mm per month. The wettest month is October, averaging 97mm of rainfall. September and August also tend to see above-average precipitation. The driest month is February, with just 10mm. That's 87mm less than October, 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.

Cornillon 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 March, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 7km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

It is currently spring in Cornillon, which began on March 20, 2026. Cornillon 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 32°C, while the coldest stretch bottoms out in January near 18°C. Summer is next, beginning on June 21, 2026 — 90 days from now.

The best time to visit Cornillon is during January, February, March, April, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 34mm per month. By contrast, July can be uncomfortably hot with temperatures reaching 32°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 Cornillon 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.