Average annual temperature is 25.8 °C
Absolute maximum temperature: 38.0 °C
Absolute minimum temperature: 14.3 °C
Number of sunny days: 165 days
Number of rainy days: 200 days
Look at detailed online map of Birissa
* Weather data for Birissa Guinea is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 34.6 | 36.9 | 38.0 | 37.5 | 34.9 | 33.0 | 31.9 | 32.1 | 31.9 | 32.8 | 34.1 | 34.8 |
| Average daytime temperature (°C) | 32.3 | 35.2 | 36.0 | 35.1 | 32.3 | 29.9 | 29.5 | 29.0 | 29.6 | 30.3 | 32.4 | 32.8 |
| Average temperature (°C) | 24.2 | 27.4 | 28.6 | 28.4 | 26.6 | 25.2 | 24.6 | 24.4 | 24.6 | 25.2 | 26.0 | 24.7 |
| Average night temperature (°C) | 17.2 | 20.3 | 22.2 | 23.1 | 22.9 | 22.1 | 21.6 | 21.5 | 21.4 | 21.6 | 20.6 | 17.3 |
| Absolute minimum temperature (°C) | 15.1 | 17.1 | 18.9 | 22.0 | 21.9 | 21.4 | 20.3 | 20.6 | 20.8 | 20.6 | 16.6 | 14.3 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 |
| Daylight mean duration (h) | 11.6 | 11.8 | 12.1 | 12.4 | 12.6 | 12.7 | 12.7 | 12.5 | 12.2 | 11.9 | 11.7 | 11.5 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 10.1 | 10.0 | 10.1 | 9.9 | 8.4 | 7.7 | 8.5 | 7.6 | 8.7 | 9.2 | 10.3 | 10.3 |
| Precipitation (mm) | 0 | 0 | 11 | 34 | 179 | 184 | 341 | 278 | 331 | 254 | 19 | 0 |
| Sunny days | 29 | 28 | 27 | 23 | 5 | 2 | 0 | 0 | 0 | 2 | 18 | 31 |
| Rainy days | 2 | 0 | 4 | 7 | 26 | 28 | 31 | 31 | 30 | 29 | 12 | 0 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Birissa is at