Chehalis, Washington, United States Climate Change Severity

43
High
The current climate change severity in Chehalis is High, with a 1.2% worsening in the climate score compared to last 15 years. This suggests deteriorating conditions, with increasing negative impacts on weather patterns and environmental conditions.
Data: Jan. to Jul. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

Chehalis Weather Condition Changes (Historic Vs 2025)

2025
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2025

Over the past 15 year(s), Chehalis temperature has changed by around +1.7%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Jul. (Historical Vs 2025)

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
2824
-14.2%
cloudyCloudy
4330
-30.2%
rainyRainy
10772
-32.7%
snowySnowy
23
50%
mistyMisty
030
100%

Disclaimer: Other weather conditions not shown may affect the total day count.

Climate Change Indicators:

Over the past 15 years, Chehalis has experienced measurable shifts in key climate parameters, contributing to the current severity score of 43 (within the High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:

Severity Score

43/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Chehalis experienced significant changes:

Temperature change of

+0.1 °C

Variation in annual rainfall

-25.01 %

Change in average humidity

-4.2 %

PM2.5 levels surged by

-8.03 %

Heatwave changed by

-5.2 day(s)

Coldwave changed by

-4.8 day(s)

Wind speeds changed by

+2.04 km/h

These indicators show that Chehalis is experiencing a more volatile and extreme climate, reinforcing the need for urgent intervention to mitigate risks. As the severity score rises, focus must shift to adaptation and emergency preparedness.

Check how we calculate Climate Change Severity
Based on data from Jan. to Jul.

Chehalis Weather Forecast 30 Days (August - September 2025)
Chehalis, Washington, United States

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Tue. 12, Aug.
sunnySunny
Temperature Icon34°/19°
Humidity Icon56%
Wind Icon16km/h
Wed. 13, Aug.
overcastOvercast
Temperature Icon18°/13°
Humidity Icon88%
Wind Icon17km/h
Thu. 14, Aug.
overcastOvercast
Temperature Icon19°/12°
Humidity Icon79%
Wind Icon14km/h
Fri. 15, Aug.
heavy rainHeavy rain
Temperature Icon16°/13°
Humidity Icon96%
Wind Icon16km/h
Sat. 16, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon22°/11°
Humidity Icon79%
Wind Icon10km/h
Sun. 17, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon21°/10°
Humidity Icon76%
Wind Icon7km/h
Mon. 18, Aug.
sunnySunny
Temperature Icon23°/9°
Humidity Icon69%
Wind Icon11km/h
Tue. 19, Aug.
sunnySunny
Temperature Icon26°/9°
Humidity Icon66%
Wind Icon10km/h
Wed. 20, Aug.
sunnySunny
Temperature Icon27°/9°
Humidity Icon61%
Wind Icon8km/h
Thu. 21, Aug.
sunnySunny
Temperature Icon28°/10°
Humidity Icon61%
Wind Icon9km/h
Fri. 22, Aug.
sunnySunny
Temperature Icon30°/10°
Humidity Icon55%
Wind Icon12km/h
Sat. 23, Aug.
sunnySunny
Temperature Icon25°/10°
Humidity Icon68%
Wind Icon17km/h
Sun. 24, Aug.
partly cloudyPartly Cloudy
Temperature Icon25°/10°
Humidity Icon69%
Wind Icon13km/h
Mon. 25, Aug.
sunnySunny
Temperature Icon27°/9°
Humidity Icon67%
Wind Icon8km/h
Tue. 26, Aug.
patchy rain possiblePatchy rain possible
Temperature Icon25°/12°
Humidity Icon71%
Wind Icon12km/h
Wed. 27, Aug.
patchy rain possiblePatchy rain possible
Temperature Icon25°/12°
Humidity Icon73%
Wind Icon12km/h
Thu. 28, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon25°/12°
Humidity Icon74%
Wind Icon9km/h
Fri. 29, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/12°
Humidity Icon80%
Wind Icon13km/h
Sat. 30, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon22°/12°
Humidity Icon78%
Wind Icon11km/h
Sun. 31, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/11°
Humidity Icon80%
Wind Icon10km/h
Mon. 1, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon24°/10°
Humidity Icon76%
Wind Icon9km/h
Tue. 2, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon25°/10°
Humidity Icon73%
Wind Icon12km/h
Wed. 3, Sep.
moderate rain at timesModerate rain at times
Temperature Icon24°/11°
Humidity Icon74%
Wind Icon10km/h
Thu. 4, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon24°/11°
Humidity Icon73%
Wind Icon10km/h
Fri. 5, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/11°
Humidity Icon74%
Wind Icon10km/h
Sat. 6, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/11°
Humidity Icon76%
Wind Icon10km/h
Sun. 7, Sep.
moderate rain at timesModerate rain at times
Temperature Icon25°/11°
Humidity Icon74%
Wind Icon11km/h
Mon. 8, Sep.
moderate rain at timesModerate rain at times
Temperature Icon23°/11°
Humidity Icon74%
Wind Icon9km/h
Tue. 9, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/11°
Humidity Icon77%
Wind Icon10km/h
Wed. 10, Sep.
moderate rain at timesModerate rain at times
Temperature Icon24°/11°
Humidity Icon72%
Wind Icon11km/h
Thu. 11, Sep.
moderate rain at timesModerate rain at times
Temperature Icon25°/10°
Humidity Icon68%
Wind Icon9km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onTue. 12, Aug.

34.2°C

Low will be onTue. 19, Aug.

9°C

HumidityHumidity

High will be onFri. 15, Aug.

96%

Low will be onFri. 22, Aug.

55%

Wind SpeedWind Speed

High will be onSat. 23, Aug.

17.3km/h

Low will be onSun. 17, Aug.

7.2km/h

PrecipitationPrecipitation

High will be onFri. 15, Aug.

29.06mm

Low will be onSun. 17, Aug.

0.1mm

Ultraviolet IndexUV

High will be onMon. 18, Aug.

5

Low will be onSun. 17, Aug.

3

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