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Chehalis (WA) Weather and Climate: A Comprehensive Guide

The climate in Chehalis is marked by big temperature swings throughout the year. Temperatures range from warm during the warmest months to cold in the cooler months. It also has a notably wet climate with much precipitation. Let's now guide you through the climate details for a complete overview.

Average maximum day and minimum night temperature

In Chehalis, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a comfortable 27°C in August, the warmest time of the year, to a chilly 7°C during cooler months like December.

At night, temperatures typically drop to an average of around 1°C during these months. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Chehalis experiences significant rain/snowfall throughout the year, averaging 1116 mm of precipitation annually. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, November receives heavy rainfall, averaging 195 mm of precipitation, recorded across 20 rainy days. In contrast, the drier season, July brings less rainfall, with 12 mm 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

Forecast for Chehalis (WA)

Mon   Dec 23
10°C | 6°C
N 5 m/s
3 mm
broken clouds and rain

broken clouds and rain

Tue   Dec 24
11°C | 5°C
SW 2 m/s
1.1 mm
partly cloudy and  chance of slight rain

partly cloudy and chance of slight rain

Wed   Dec 25
9°C | 5°C
SE 6 m/s
25 mm
overcast and heavy rain

overcast and heavy rain

The best time of year to visit Chehalis in the United States of America

During the months of June and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • Which months have the greatest rainfall in Chehalis?
    Most rainfall (rainy season) is seen in January, November and December.
  • Does Chehalis have a dry season?
    Yes, the months of July and August are very dry.
  • Which is the warmest month in Chehalis?
    August has an average maximum temperature of 27°C and is the warmest month of the year.
  • Which is the coldest month in Chehalis?
    The coldest month is December with an average maximum temperature of 7°C.
  • Which is the wettest month in Chehalis?
    November tops the wettest month list with 195 mm of rainfall.
  • Which is the driest month in Chehalis?
    July is the driest month with 12 mm of precipitation.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.