Average annual temperature is 12.8 °C
Absolute maximum temperature: 33.6 °C
Absolute minimum temperature: -5.7 °C
Number of sunny days: 135 days
Number of rainy days: 230 days
Look at detailed online map of Grignon
* Weather data for Grignon France is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 15.6 | 14.2 | 19.3 | 20.7 | 25.4 | 31.2 | 32.6 | 30.8 | 33.6 | 26.9 | 16.8 | 13.8 |
| Average daytime temperature (°C) | 7.9 | 9.5 | 12.1 | 13.8 | 19.1 | 26.4 | 24.9 | 23.6 | 24.9 | 18.8 | 11.5 | 9.4 |
| Average temperature (°C) | 5.5 | 5.3 | 8.4 | 9.5 | 14.4 | 20.8 | 20.3 | 19.4 | 19.6 | 14.3 | 8.7 | 7.2 |
| Average night temperature (°C) | 2.9 | 1.7 | 4.6 | 5.1 | 9.6 | 14.9 | 15.3 | 15.2 | 14.5 | 10.3 | 6.1 | 5.0 |
| Absolute minimum temperature (°C) | -3.8 | -5.7 | -2.6 | -1.2 | 5.6 | 9.7 | 11.3 | 10.6 | 7.6 | 4.3 | -1.1 | -3.2 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 10.0 | 12.0 | 14.0 | 15.0 | 16.0 | 16.0 | 15.0 | 13.0 | 11.0 | 9.0 | 8.0 |
| Daylight mean duration (h) | 8.8 | 10.2 | 11.9 | 13.7 | 15.3 | 16.1 | 15.7 | 14.3 | 12.6 | 10.8 | 9.2 | 8.3 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 13.0 | 11.0 | 9.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 2.6 | 4.8 | 6.0 | 7.8 | 11.4 | 12.6 | 10.6 | 9.7 | 9.4 | 6.7 | 4.5 | 2.2 |
| Precipitation (mm) | 64 | 11 | 100 | 75 | 66 | 70 | 95 | 117 | 77 | 94 | 110 | 73 |
| Sunny days | 8 | 20 | 6 | 8 | 16 | 18 | 10 | 6 | 18 | 12 | 3 | 10 |
| Rainy days | 23 | 8 | 25 | 22 | 15 | 12 | 21 | 25 | 12 | 19 | 27 | 21 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Grignon during the most sunny months:
Months with the longest average daylight duration in Grignon:
The largest precipitation sum in Grignon is at