Average annual temperature is 21.9 °C
Absolute maximum temperature: 42.5 °C
Absolute minimum temperature: -1.9 °C
Number of sunny days: 193 days
Number of rainy days: 172 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) | 26.3 | 29.6 | 34.4 | 35.3 | 33.5 | 39.5 | 40.6 | 42.5 | 40.8 | 35.5 | 28.7 | 25.6 |
| Average daytime temperature (°C) | 18.6 | 20.1 | 25.0 | 25.3 | 28.7 | 35.8 | 38.0 | 40.2 | 35.7 | 28.0 | 20.2 | 19.2 |
| Average temperature (°C) | 13.2 | 13.0 | 18.2 | 19.0 | 23.4 | 29.4 | 31.8 | 33.5 | 29.9 | 22.2 | 15.0 | 13.0 |
| Average night temperature (°C) | 8.9 | 8.5 | 13.5 | 14.3 | 19.2 | 23.7 | 25.9 | 26.9 | 24.7 | 17.7 | 11.1 | 8.0 |
| Absolute minimum temperature (°C) | -1.9 | -1.4 | 3.9 | 9.3 | 13.6 | 19.8 | 23.8 | 24.5 | 20.7 | 5.0 | 2.5 | 0.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.4 | 11.1 | 12.0 | 12.9 | 13.7 | 14.1 | 13.9 | 13.2 | 12.4 | 11.4 | 10.6 | 10.2 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 6.9 | 7.7 | 7.8 | 7.5 | 8.2 | 11.0 | 12.2 | 12.2 | 10.2 | 8.0 | 6.2 | 7.5 |
| Precipitation (mm) | 77 | 72 | 71 | 209 | 175 | 39 | 12 | 1 | 59 | 113 | 59 | 51 |
| Sunny days | 16 | 13 | 11 | 9 | 6 | 16 | 23 | 25 | 18 | 16 | 19 | 21 |
| Rainy days | 15 | 15 | 20 | 21 | 25 | 14 | 8 | 6 | 12 | 15 | 11 | 10 |
| 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