Average annual temperature is 26.3 °C
Absolute maximum temperature: 37.9 °C
Absolute minimum temperature: 19.9 °C
Number of sunny days: 38 days
Number of rainy days: 327 days
Look at detailed online map of Grand Siton
* Weather data for Grand Siton French Guiana is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 30.8 | 31.3 | 33.5 | 33.1 | 33.3 | 32.8 | 32.2 | 35.0 | 37.6 | 37.9 | 37.6 | 34.7 |
| Average daytime temperature (°C) | 28.7 | 28.5 | 30.8 | 30.3 | 30.7 | 30.9 | 30.7 | 32.7 | 35.0 | 36.0 | 34.9 | 32.2 |
| Average temperature (°C) | 24.1 | 24.1 | 25.4 | 25.4 | 25.6 | 25.8 | 25.8 | 27.1 | 28.3 | 29.1 | 28.2 | 26.6 |
| Average night temperature (°C) | 21.6 | 22.2 | 22.2 | 22.6 | 22.9 | 22.9 | 22.8 | 23.3 | 23.8 | 24.4 | 24.1 | 23.5 |
| Absolute minimum temperature (°C) | 19.9 | 21.3 | 21.0 | 21.1 | 22.4 | 22.1 | 21.2 | 22.1 | 21.9 | 23.5 | 22.7 | 22.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 |
| Daylight mean duration (h) | 11.9 | 12.0 | 12.1 | 12.2 | 12.3 | 12.4 | 12.3 | 12.3 | 12.1 | 12.0 | 11.9 | 11.9 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 7.3 | 5.9 | 9.9 | 7.5 | 7.6 | 8.8 | 9.9 | 10.8 | 10.6 | 10.5 | 10.3 | 9.3 |
| Precipitation (mm) | 425 | 499 | 246 | 454 | 432 | 270 | 287 | 124 | 28 | 63 | 80 | 146 |
| Sunny days | 1 | 0 | 0 | 2 | 0 | 0 | 0 | 8 | 9 | 14 | 3 | 1 |
| Rainy days | 30 | 28 | 31 | 28 | 31 | 30 | 31 | 23 | 21 | 17 | 27 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Grand Siton is at