Walla Walla (WA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Walla Walla.
Climate overview of Walla Walla
Temperatures in Walla Walla, Washington State, United States of America, vary greatly throughout the year. July is the hottest month at 33°C (91°F), while December is the coldest at 5°C (41°F).
The city tends toward dry conditions, with around 477 mm (19 in) of rain/snowfall per year. It does, however, have a distinct dry season from June to September, with very warm summers and cold winters.
Walla Walla Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Walla Walla - and find the best time to visit.
Monthly Temperature in Walla Walla
The climate in Walla Walla is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a very warm 33°C (91°F) in July to a chilly 5°C (41°F) in the coolest month, December.
Nights vary from 17°C (63°F) in July to around -2°C (28°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Walla Walla
Walla Walla has a relatively dry climate with low precipitation, averaging 477 mm (19 in) of rain/snowfall annually. The climate in Walla Walla shows significant variation throughout the year. Expect moderate rainfall in March, the wettest month, with an average of 69 mm (2.7 in) of precipitation over 17 rainy days.
In contrast, the driest month July offers drier and sunnier days, with around 7.7 mm (0.3 in) of rainfall over 3 rainy days. For more details, please visit our Walla Walla Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Walla Walla
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June and September
- Warmest weather: July and August
- Fewest rainy days: July, August and September
- Seasonal pattern: A distinct dry season from June to September, with very warm summers and cold winters
- Coldest conditions: December, with freezing nights around -2°C (28°F).
Frequently asked questions about the climate in Walla Walla
What is the best time to visit Walla Walla?
May, June and September typically offer the most optimal weather in Walla Walla. In contrast, January, February, November and December tend to have less optimal conditions. Walla Walla has a distinct dry season from June to September, with very warm summers and cold winters.
What temperatures can I expect in Walla Walla?
Daytime highs range from 5°C (41°F) in December to 33°C (91°F) in July. Nighttime lows range from -2°C (28°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Walla Walla get?
Annual rainfall is around 477 mm (19 in). March is the wettest month with 69 mm (2.7 in), while July is the driest with 7.7 mm (0.3 in).
Walla Walla 3-Day Forecast
Walla Walla on the map
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