Average annual temperature is 23.9 °C
Absolute maximum temperature: 37.5 °C
Absolute minimum temperature: 11.7 °C
Number of sunny days: 210 days
Number of rainy days: 155 days
Look at detailed online map of Unión
* Weather data for Unión Guatemala is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 32.2 | 32.8 | 34.5 | 36.4 | 36.5 | 37.5 | 31.2 | 32.3 | 32.7 | 33.0 | 30.7 | 32.0 |
| Average daytime temperature (°C) | 28.3 | 28.7 | 31.5 | 33.7 | 34.3 | 33.3 | 29.1 | 29.4 | 30.3 | 29.3 | 27.3 | 26.9 |
| Average temperature (°C) | 21.9 | 22.0 | 24.4 | 26.1 | 26.6 | 26.5 | 23.8 | 23.8 | 24.2 | 23.6 | 22.4 | 21.5 |
| Average night temperature (°C) | 17.0 | 17.0 | 18.9 | 19.6 | 20.6 | 20.9 | 19.9 | 19.4 | 19.6 | 19.5 | 18.5 | 17.3 |
| Absolute minimum temperature (°C) | 12.8 | 15.3 | 17.6 | 17.5 | 19.0 | 18.5 | 16.4 | 16.5 | 18.8 | 17.1 | 16.6 | 11.7 |
| 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 | 12.6 | 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) | 10.4 | 10.7 | 11.1 | 11.7 | 11.7 | 11.2 | 10.6 | 10.3 | 10.6 | 9.9 | 8.8 | 9.9 |
| Precipitation (mm) | 0 | 8 | 26 | 3 | 29 | 102 | 194 | 115 | 54 | 87 | 82 | 5 |
| Sunny days | 30 | 25 | 20 | 24 | 20 | 12 | 11 | 9 | 9 | 8 | 19 | 23 |
| Rainy days | 1 | 3 | 11 | 6 | 11 | 18 | 20 | 22 | 21 | 23 | 11 | 8 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Unión is at