Average annual temperature is 24.7 °C
Absolute maximum temperature: 37.8 °C
Absolute minimum temperature: 14.2 °C
Number of sunny days: 72 days
Number of rainy days: 293 days
Look at detailed online map of Castanhão
* Weather data for Castanhão Brazil is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 31.7 | 33.6 | 32.7 | 34.4 | 31.5 | 30.2 | 33.4 | 35.4 | 35.9 | 37.0 | 37.8 | 37.1 |
| Average daytime temperature (°C) | 29.3 | 31.2 | 30.6 | 31.2 | 28.6 | 27.5 | 27.7 | 29.6 | 30.8 | 32.7 | 33.5 | 34.3 |
| Average temperature (°C) | 24.5 | 25.6 | 25.0 | 25.4 | 23.6 | 22.4 | 22.1 | 23.5 | 24.5 | 25.9 | 26.7 | 27.4 |
| Average night temperature (°C) | 21.0 | 21.3 | 21.2 | 21.7 | 20.1 | 18.6 | 18.2 | 19.2 | 20.3 | 20.9 | 21.7 | 22.2 |
| Absolute minimum temperature (°C) | 18.5 | 19.3 | 17.3 | 19.3 | 16.5 | 14.8 | 14.2 | 15.4 | 16.7 | 18.2 | 18.6 | 20.2 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 |
| Daylight mean duration (h) | 12.8 | 12.5 | 12.2 | 11.8 | 11.5 | 11.3 | 11.4 | 11.7 | 12.0 | 12.4 | 12.8 | 12.9 |
| Daylight minimum duration (h) | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 |
| Sunshine mean duration (h) | 10.8 | 10.7 | 10.5 | 9.9 | 8.9 | 8.4 | 8.8 | 9.5 | 10.0 | 10.4 | 11.0 | 11.1 |
| Precipitation (mm) | 65 | 38 | 54 | 53 | 45 | 21 | 32 | 21 | 26 | 24 | 59 | 53 |
| Sunny days | 1 | 3 | 0 | 5 | 4 | 8 | 5 | 11 | 6 | 10 | 13 | 6 |
| Rainy days | 30 | 25 | 31 | 25 | 27 | 22 | 26 | 20 | 24 | 21 | 17 | 25 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Castanhão is at