Average annual temperature is 20.2 °C
Absolute maximum temperature: 33.3 °C
Absolute minimum temperature: 5.3 °C
Number of sunny days: 198 days
Number of rainy days: 167 days
Look at detailed online map of Unión
* Weather data for Unión Mexico is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 28.1 | 30.8 | 31.0 | 32.7 | 33.2 | 33.3 | 28.7 | 30.2 | 31.0 | 30.8 | 30.6 | 29.1 |
| Average daytime temperature (°C) | 25.3 | 26.0 | 28.9 | 29.7 | 30.1 | 29.7 | 26.8 | 27.6 | 28.4 | 27.4 | 27.0 | 25.0 |
| Average temperature (°C) | 17.5 | 17.9 | 20.3 | 21.4 | 22.1 | 22.5 | 20.5 | 20.9 | 21.3 | 20.6 | 19.9 | 17.4 |
| Average night temperature (°C) | 11.5 | 11.9 | 13.5 | 14.7 | 16.0 | 16.9 | 16.1 | 16.1 | 15.9 | 15.8 | 14.8 | 11.8 |
| Absolute minimum temperature (°C) | 7.8 | 7.9 | 9.6 | 13.2 | 13.9 | 14.9 | 14.4 | 14.3 | 14.2 | 11.3 | 10.9 | 5.3 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Daylight mean duration (h) | 11.3 | 11.6 | 12.0 | 12.5 | 12.9 | 13.1 | 13.0 | 12.7 | 12.2 | 11.8 | 11.4 | 11.2 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 13.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 10.5 | 10.7 | 11.1 | 11.5 | 11.3 | 11.2 | 10.5 | 10.7 | 10.9 | 10.2 | 10.0 | 10.0 |
| Precipitation (mm) | 0 | 2 | 4 | 26 | 24 | 59 | 143 | 98 | 85 | 31 | 9 | 2 |
| Sunny days | 30 | 25 | 25 | 16 | 15 | 7 | 1 | 10 | 15 | 10 | 20 | 24 |
| Rainy days | 1 | 3 | 6 | 14 | 16 | 23 | 30 | 21 | 15 | 21 | 10 | 7 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Unión is at