United States of America
Walla Walla sees feels-like daytime highs peak around 37.1°C in July and nighttime lows bottom out near -0.7°C in January. November is the wettest month (~48 mm), while August is the driest (~11 mm). For sunshine, August leads with about 78% clear skies.
Based on mild feels-like temperatures and low rain chances, the most comfortable months are September, May, and June — expect around 15.6–27.9°C with roughly 11% chance of rain on a given day in September.
| Month | Low / High °C | Rain % | Rainfall | Clear skies | Wind |
|---|---|---|---|---|---|
| January | -0.7° / 3.7° | 23% | 40 mm | 33% | 12.6 kph |
| February | 1.9° / 8.2° | 23% | 35 mm | 36% | 12.6 kph |
| March | 5° / 13.8° | 26% | 37 mm | 37% | 12.4 kph |
| April | 8.5° / 19° | 22% | 31 mm | 43% | 12 kph |
| May☀ | 12.8° / 25.2° | 22% | 34 mm | 48% | 11.4 kph |
| June☀ | 17.4° / 30.8° | 17% | 26 mm | 60% | 11.2 kph |
| July | 21° / 37.1° | 9% | 12 mm | 77% | 11.1 kph |
| August | 20.6° / 35.6° | 7% | 11 mm | 78% | 10.8 kph |
| September☀ | 15.6° / 27.9° | 11% | 15 mm | 68% | 10.8 kph |
| October | 9.1° / 18.3° | 20% | 31 mm | 51% | 11.6 kph |
| November | 3° / 9.2° | 30% | 48 mm | 37% | 12.8 kph |
| December | -0.7° / 3.7° | 25% | 46 mm | 34% | 12.8 kph |
Feels-like temperatures from long-term historical data; ☀ marks the most comfortable months (mild temperatures, low rain).
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