Average annual temperature is 15.9 °C
Absolute maximum temperature: 42.0 °C
Absolute minimum temperature: -1.7 °C
Number of sunny days: 270 days
Number of rainy days: 95 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) | 17.2 | 18.9 | 19.8 | 30.9 | 32.2 | 39.0 | 42.0 | 41.2 | 34.2 | 34.7 | 26.4 | 18.7 |
| Average daytime temperature (°C) | 13.5 | 13.7 | 14.9 | 22.1 | 25.2 | 29.7 | 36.8 | 36.2 | 30.0 | 26.9 | 19.3 | 15.7 |
| Average temperature (°C) | 8.6 | 7.5 | 9.5 | 14.1 | 17.0 | 20.3 | 25.6 | 25.8 | 21.3 | 18.5 | 12.1 | 9.9 |
| Average night temperature (°C) | 5.1 | 3.0 | 5.5 | 7.9 | 10.8 | 13.1 | 16.4 | 17.8 | 14.7 | 11.9 | 6.5 | 6.0 |
| Absolute minimum temperature (°C) | -1.7 | -1.1 | 0.1 | 2.8 | 7.6 | 10.8 | 11.8 | 13.5 | 11.9 | 4.5 | 0.3 | 0.2 |
| 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 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 9.6 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.5 | 7.5 | 7.5 | 11.4 | 11.7 | 13.0 | 13.5 | 12.3 | 10.9 | 9.7 | 8.2 | 6.2 |
| Precipitation (mm) | 244 | 90 | 279 | 4 | 26 | 0 | 0 | 8 | 12 | 11 | 41 | 127 |
| Sunny days | 13 | 17 | 9 | 26 | 24 | 30 | 31 | 29 | 26 | 25 | 23 | 17 |
| Rainy days | 18 | 11 | 22 | 4 | 7 | 0 | 0 | 2 | 4 | 6 | 7 | 14 |
| 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