Average annual temperature is 17.4 °C
Absolute maximum temperature: 36.1 °C
Absolute minimum temperature: -3.5 °C
Number of sunny days: 175 days
Number of rainy days: 190 days
Look at detailed online map of Waterloo
* Weather data for Waterloo United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 20.8 | 26.8 | 25.7 | 28.9 | 31.1 | 35.4 | 35.2 | 36.1 | 32.6 | 30.2 | 25.9 | 20.1 |
| Average daytime temperature (°C) | 13.5 | 16.7 | 17.9 | 21.0 | 26.3 | 30.7 | 31.8 | 31.4 | 29.3 | 24.0 | 17.7 | 13.6 |
| Average temperature (°C) | 9.0 | 10.7 | 12.4 | 15.5 | 20.8 | 24.5 | 26.6 | 26.3 | 23.5 | 18.4 | 12.0 | 8.5 |
| Average night temperature (°C) | 5.5 | 6.8 | 8.1 | 11.1 | 16.1 | 19.5 | 22.5 | 22.5 | 19.1 | 14.1 | 7.7 | 4.6 |
| Absolute minimum temperature (°C) | -2.0 | -2.9 | -3.5 | 6.4 | 7.7 | 15.1 | 18.4 | 17.8 | 15.3 | 2.5 | -0.2 | -1.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 5.2 | 5.9 | 8.3 | 8.3 | 11.2 | 12.0 | 10.9 | 10.2 | 10.7 | 8.6 | 7.4 | 7.1 |
| Precipitation (mm) | 191 | 107 | 159 | 138 | 56 | 90 | 150 | 90 | 16 | 15 | 88 | 80 |
| Sunny days | 11 | 9 | 16 | 12 | 13 | 15 | 9 | 13 | 17 | 21 | 20 | 19 |
| Rainy days | 20 | 19 | 15 | 18 | 18 | 15 | 22 | 18 | 13 | 10 | 10 | 12 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Waterloo during the most sunny months:
The largest precipitation sum in Waterloo is at