Average annual temperature is 25.9 °C
Absolute maximum temperature: 37.8 °C
Absolute minimum temperature: 17.8 °C
Number of sunny days: 89 days
Number of rainy days: 276 days
Look at detailed online map of Siena
* Weather data for Siena Sierra Leone is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 36.3 | 37.4 | 37.8 | 36.0 | 34.7 | 33.2 | 33.1 | 32.5 | 32.6 | 31.9 | 32.6 | 34.6 |
| Average daytime temperature (°C) | 34.6 | 35.8 | 34.6 | 33.7 | 32.3 | 29.8 | 29.5 | 28.8 | 29.4 | 29.7 | 30.6 | 32.7 |
| Average temperature (°C) | 26.7 | 28.1 | 27.3 | 27.1 | 26.4 | 25.0 | 24.7 | 24.5 | 24.8 | 25.1 | 25.8 | 26.0 |
| Average night temperature (°C) | 21.1 | 22.8 | 23.0 | 23.5 | 23.5 | 22.7 | 22.4 | 22.5 | 22.6 | 22.8 | 23.1 | 21.4 |
| Absolute minimum temperature (°C) | 17.8 | 21.0 | 21.0 | 22.7 | 22.6 | 21.8 | 21.6 | 21.6 | 21.6 | 22.0 | 22.2 | 17.9 |
| 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) | 11.7 | 11.9 | 12.1 | 12.3 | 12.5 | 12.6 | 12.5 | 12.4 | 12.2 | 11.9 | 11.8 | 11.7 |
| 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) | 9.7 | 9.8 | 8.6 | 8.1 | 7.2 | 7.2 | 7.1 | 5.1 | 6.7 | 7.0 | 8.0 | 9.7 |
| Precipitation (mm) | 13 | 2 | 97 | 133 | 333 | 390 | 496 | 624 | 407 | 392 | 144 | 10 |
| Sunny days | 24 | 20 | 13 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 26 |
| Rainy days | 7 | 8 | 18 | 27 | 31 | 30 | 31 | 31 | 30 | 31 | 27 | 5 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Siena during the most sunny months:
The largest precipitation sum in Siena is at