National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorms in the Central Plains and Lower Missouri Valley; Heat Continues in the Southeast and Southwest

Severe thunderstorms capable of large hail and damaging wind gusts are forecast to impact the central Plains into the Lower Missouri Valley through this afternoon. Dangerous heat persists across the southern Plains, Southeast U.S. and Puerto Rico this week, and will return to the Southwest today. Read More >

Current conditions at

Chehalis-Centralia Airport (KCLS)

Lat: 46.677°NLon: 122.9827°WElev: 177.0ft.

Clear

72°F

22°C

Humidity 68%
Wind Speed SSE 4 MPH
Barometer 30.13 in (1020.32 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 18 Aug 12:55 PM PDT
Extended Forecast for

Chehalis WA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 80. Calm wind becoming west northwest around 6 mph.

    High: 80 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 54. West wind around 6 mph becoming calm in the evening.

    Low: 54 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Cloudy through mid morning, then gradual clearing, with a high near 80. Calm wind.

    High: 80 °F

    Gradual
    Clearing

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 87. Calm wind.

    High: 87 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 80.

    High: 80 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A slight chance of rain after 11pm. Partly cloudy, with a low around 55.

    Low: 55 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: A slight chance of rain before 11am. Cloudy, with a high near 71.

    High: 71 °F

    Slight Chance
    Rain then
    Mostly Cloudy

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 80. Calm wind becoming west northwest around 6 mph.
Tonight
Increasing clouds, with a low around 54. West wind around 6 mph becoming calm in the evening.
Wednesday
Cloudy through mid morning, then gradual clearing, with a high near 80. Calm wind.
Wednesday Night
Partly cloudy, with a low around 54. Calm wind.
Thursday
Mostly sunny, with a high near 87. Calm wind.
Thursday Night
Partly cloudy, with a low around 56.
Friday
Mostly cloudy, with a high near 80.
Friday Night
A slight chance of rain after 11pm. Partly cloudy, with a low around 55.
Saturday
A slight chance of rain before 11am. Cloudy, with a high near 71.
Saturday Night
Mostly cloudy, with a low around 55.
Sunday
Mostly cloudy, with a high near 77.
Sunday Night
Mostly clear, with a low around 53.
Monday
Partly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Chehalis WA
 46.66°N 122.98°W (Elev. 177 ft)
Last Update:
11:26 am PDT Aug 18, 2026
Forecast Valid:
1pm PDT Aug 18, 2026-6pm PDT Aug 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation