United States of America
Waterloo sees feels-like daytime highs peak around 34.6°C in July and nighttime lows bottom out near -11.6°C in January. June is the wettest month (~115 mm), while January is the driest (~8 mm). For sunshine, August leads with about 68% clear skies.
Based on mild feels-like temperatures and low rain chances, the most comfortable months are September, May, and August — expect around 14.7–25.7°C with roughly 30% chance of rain on a given day in September.
| Month | Low / High °C | Rain % | Rainfall | Clear skies | Wind |
|---|---|---|---|---|---|
| January | -11.6° / -4.4° | 3% | 8 mm | 44% | 19.3 kph |
| February | -8.9° / -2° | 5% | 12 mm | 44% | 19.7 kph |
| March | -2.2° / 6.4° | 15% | 36 mm | 47% | 20.4 kph |
| April | 5.3° / 16° | 29% | 74 mm | 50% | 20.1 kph |
| May☀ | 13.3° / 24.5° | 38% | 98 mm | 52% | 18 kph |
| June | 19.9° / 31.4° | 41% | 115 mm | 59% | 15.3 kph |
| July | 22.5° / 34.6° | 40% | 108 mm | 67% | 13.5 kph |
| August☀ | 20° / 31.6° | 36% | 100 mm | 68% | 13.3 kph |
| September☀ | 14.7° / 25.7° | 30% | 81 mm | 67% | 15.4 kph |
| October | 6.4° / 16.5° | 23% | 62 mm | 59% | 17.4 kph |
| November | -1.9° / 6.7° | 14% | 40 mm | 49% | 18.3 kph |
| December | -8.8° / -1.9° | 6% | 18 mm | 44% | 18.6 kph |
Feels-like temperatures from long-term historical data; ☀ marks the most comfortable months (mild temperatures, low rain).
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