Chehalis (WA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Chehalis.
Climate overview of Chehalis
The climate in Chehalis, Washington State, United States of America, is marked by large temperature swings across the seasons, ranging from 27°C (81°F) in August to 7°C (45°F) in December.
Rain/snowfall is high, totalling around 1116 mm (44 in) per year. November is the wettest month and July the driest. The city also experiences a distinct dry season from June to August, with warm summers and cold winters.
Chehalis Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Chehalis - and find the best time to visit.
Monthly Temperature in Chehalis
In Chehalis, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a comfortable 27°C (81°F) in August, the warmest time of the year, to a chilly 7°C (45°F) during cooler months like December.
At night, you can expect temperatures ranging from 11°C (52°F) in August to around 1°C (34°F) during December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Chehalis
Chehalis experiences significant rain/snowfall throughout the year, averaging 1116 mm (44 in) of precipitation annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, November it receives heavy rainfall, averaging 195 mm (7.7 in) of precipitation, recorded across 20 rainy days. In contrast, the driest month July brings less rainfall, with 12 mm (0.5 in) over 4 rainy days. For more details, please visit our Chehalis 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 Chehalis
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, July, August and September
- Warmest weather: July and August
- Fewest rainy days: July and August
- Wettest months: January, February, March, October, November and December, when rainfall is highest.
- Seasonal pattern: A distinct dry season from June to August, with warm summers and cold winters
Frequently asked questions about the climate in Chehalis
What is the best time to visit Chehalis?
May, June, July, August and September typically offer the most optimal weather in Chehalis. In contrast, January, February, March, November and December tend to have less optimal conditions. Chehalis has a distinct dry season from June to August, with warm summers and cold winters.
What temperatures can I expect in Chehalis?
Daytime highs range from 7°C (45°F) in December to 27°C (81°F) in August. Nighttime lows range from 1°C (34°F) to 11°C (52°F). Temperatures vary considerably through the year.
How much rain does Chehalis get?
Annual rainfall is around 1116 mm (44 in). November is the wettest month with 195 mm (7.7 in), while July is the driest with 12 mm (0.5 in).
Chehalis 3-Day Forecast
Chehalis (WA) 3-Day Forecast
Chehalis on the map
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