Walla Walla Climate by Month
Walla Walla, Washington, United States
Hot summers and cold winters, with rain spread through the year.
Walla Walla has hot summers and cold winters, with rain spread through the year. July is the warmest month, with highs around 90°F (32°C); December is the coolest at 41°F (5°C), and nights dip to 29°F (-2°C). About 16 in (401 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 90°F(32°C)
- Average high, July
- Coldest nights
- 29°F(-2°C)
- Average low, December
- Rain per year
- 16 in(401 mm)
- No clear rainy season
- Humidity
- 61%
- Sunniest: July
Best and worst months in Walla Walla
Best for weatherMay, June and September are the best time for weather in Walla Walla: highs near 77°F (25°C) and about 1.0 in (27 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 41°F (5°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Walla Walla weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 42°F(6°C) | 30°F(-1°C) | 1.8 in(45 mm) | 84% | 1.1 |
| FebFebruary | 47°F(9°C) | 32°F(0°C) | 1.5 in(39 mm) | 73% | 2.1 |
| MarMarch | 56°F(13°C) | 37°F(3°C) | 1.9 in(48 mm) | 65% | 3.4 |
| AprApril | 63°F(17°C) | 41°F(5°C) | 1.3 in(34 mm) | 60% | 4.9 |
| MayMayBest | 73°F(23°C) | 47°F(9°C) | 1.6 in(40 mm) | 51% | 6.0 |
| JunJuneBest | 80°F(27°C) | 53°F(12°C) | 1.0 in(25 mm) | 49% | 6.7 |
| JulJuly | 90°F(32°C) | 59°F(15°C) | 0.3 in(7 mm) | 38% | 7.4 |
| AugAugust | 89°F(32°C) | 57°F(14°C) | 0.4 in(10 mm) | 40% | 6.4 |
| SepSeptemberBest | 79°F(26°C) | 50°F(10°C) | 0.6 in(15 mm) | 49% | 4.6 |
| OctOctober | 65°F(18°C) | 40°F(4°C) | 1.5 in(37 mm) | 60% | 2.7 |
| NovNovember | 50°F(10°C) | 34°F(1°C) | 2.0 in(52 mm) | 77% | 1.4 |
| DecDecember | 41°F(5°C) | 29°F(-2°C) | 1.9 in(49 mm) | 87% | 0.9 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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