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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

CHEHALIS (CLSW1)

Lat: 46.61°NLon: 122.90833°WElev: 262.0ft.

NA

50°F

10°C

Humidity 100%
Wind Speed W 0 MPH
Barometer NA
Dewpoint 50°F (10°C)
Visibility NA
Last update 20 Sep 07:09 AM PDT
Extended Forecast for

2 Miles ENE Napavine WA

  • Today

    Today: Areas of fog before 10am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 76. Light north northwest wind.

    High: 76 °F

    Areas Fog
    then Sunny

  • Tonight

    Tonight: Patchy fog after midnight. Otherwise, increasing clouds, with a low around 46. Calm wind.

    Low: 46 °F

    Clear then
    Patchy Fog

  • Monday

    Monday: Areas of fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 74. Light northwest wind.

    High: 74 °F

    Areas Fog
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: Increasing clouds, with a low around 49. Light north wind.

    Low: 49 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, with a high near 71. Calm wind.

    High: 71 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 68.

    High: 68 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 66.

    High: 66 °F

    Mostly Cloudy

Detailed Forecast

Today
Areas of fog before 10am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 76. Light north northwest wind.
Tonight
Patchy fog after midnight. Otherwise, increasing clouds, with a low around 46. Calm wind.
Monday
Areas of fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 74. Light northwest wind.
Monday Night
Increasing clouds, with a low around 49. Light north wind.
Tuesday
Partly sunny, with a high near 71. Calm wind.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Mostly cloudy, with a high near 68.
Wednesday Night
Mostly cloudy, with a low around 45.
Thursday
Mostly cloudy, with a high near 66.
Thursday Night
A chance of rain, mainly after 11pm. Mostly cloudy, with a low around 46.
Friday
A chance of rain. Mostly cloudy, with a high near 63.
Friday Night
A slight chance of rain. Mostly cloudy, with a low around 43.
Saturday
Partly sunny, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Napavine WA
 46.59°N 122.86°W (Elev. 400 ft)
Last Update:
12:25 am PDT Sep 20, 2026
Forecast Valid:
7am PDT Sep 20, 2026-6pm PDT Sep 26, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation