Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

Severe thunderstorms will be possible across the northern/central Plains through Tuesday afternoon and from the central Plains to the Mid-Mississippi Valley Tuesday evening through Wednesday morning. Storms may produce large hail and damaging wind gusts, and heavy rainfall may lead to scattered instances of flash flooding. Meanwhile, hazardous heat persists across the South and Southeast. Read More >

Current conditions at

Chehalis-Centralia Airport (KCLS)

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

Overcast

59°F

15°C

Humidity 100%
Wind Speed SW 4 MPH
Barometer 30.12 in (1019.98 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 18 Aug 02:55 AM PDT
Extended Forecast for

Chehalis WA

  • Overnight

    Overnight: Patchy fog.  Otherwise, cloudy, with a steady temperature around 57. Calm wind.

    Low: 57 °F

    Patchy Fog

  • Tuesday

    Tuesday: Patchy fog before 10am.  Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 79. Calm wind becoming west northwest 5 to 7 mph in the afternoon.

    High: 79 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 55. West northwest wind 5 to 7 mph becoming calm  in the evening.

    Low: 55 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Cloudy, then gradually becoming mostly sunny, with a high near 80. Calm wind.

    High: 80 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55. Light north wind.

    Low: 55 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of rain after 11pm.  Partly cloudy, with a low around 56.

    Low: 56 °F

    Slight Chance
    Rain

  • Friday

    Friday: Mostly cloudy, with a high near 79.

    High: 79 °F

    Mostly Cloudy

  • Friday Night

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

    Low: 56 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog. Otherwise, cloudy, with a steady temperature around 57. Calm wind.
Tuesday
Patchy fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 79. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Tuesday Night
Increasing clouds, with a low around 55. West northwest wind 5 to 7 mph becoming calm in the evening.
Wednesday
Cloudy, then gradually becoming mostly sunny, with a high near 80. Calm wind.
Wednesday Night
Partly cloudy, with a low around 55. Light north wind.
Thursday
Mostly sunny, with a high near 86.
Thursday Night
A 20 percent chance of rain after 11pm. Partly cloudy, with a low around 56.
Friday
Mostly cloudy, with a high near 79.
Friday Night
Partly cloudy, with a low around 56.
Saturday
Cloudy, with a high near 72.
Saturday Night
Mostly cloudy, with a low around 55.
Sunday
Mostly cloudy, with a high near 78.
Sunday Night
Partly cloudy, with a low around 54.
Monday
Partly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Chehalis WA
 46.68°N 122.98°W (Elev. 180 ft)
11:26 pm PDT Aug 17, 2026
3am PDT Aug 18, 2026-6pm PDT Aug 24, 2026
 
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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