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

Heavy Rainfall and Flooding in the Southwest and Along the East Coast

A multi-day heavy rainfall event is set to begin across New Mexico into west Texas Tuesday through Wednesday. Flash flooding and debris flows in the vicinity of burn scars will also be possible. A strong coastal low will develop offshore of the Mid-Atlantic coast midweek, bringing heavy rainfall, strong winds and coastal flooding to much of the East Coast through Friday. Read More >

Current conditions at

DW8787 CHEHALIS (D8787)

Lat: 46.64646°NLon: 122.8388°WElev: 550.0ft.

NA

60°F

16°C

Humidity 89%
Wind Speed E 1 MPH
Barometer 30.03 in (1016.93 mb)
Dewpoint 57°F (14°C)
Visibility NA
Last update 21 Sep 08:30 PM PDT
Extended Forecast for

3 Miles ESE Onalaska WA

  • Tonight

    Tonight: Increasing clouds, with a low around 49. Light and variable wind.

    Low: 49 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 68. Calm wind becoming west northwest around 6 mph in the afternoon.

    High: 68 °F

    Gradual
    Clearing

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 44. West northwest wind around 5 mph becoming calm after midnight.

    Low: 44 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 66. Light and variable wind.

    High: 66 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 46. North wind around 5 mph becoming calm after midnight.

    Low: 46 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain after 11am. Mostly cloudy, with a high near 63.

    High: 63 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Rain likely. Mostly cloudy, with a low around 46. Chance of precipitation is 70%.

    Low: 46 °F

    Rain Likely

  • Friday

    Friday: A chance of rain. Mostly cloudy, with a high near 59.

    High: 59 °F

    Chance Rain

  • Friday Night

    Friday Night: A slight chance of rain before 11pm. Partly cloudy, with a low around 42.

    Low: 42 °F

    Slight Chance
    Rain then
    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 49. Light and variable wind.
Tuesday
Cloudy through mid morning, then gradual clearing, with a high near 68. Calm wind becoming west northwest around 6 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 44. West northwest wind around 5 mph becoming calm after midnight.
Wednesday
Partly sunny, with a high near 66. Light and variable wind.
Wednesday Night
Mostly cloudy, with a low around 46. North wind around 5 mph becoming calm after midnight.
Thursday
A 30 percent chance of rain after 11am. Mostly cloudy, with a high near 63.
Thursday Night
Rain likely. Mostly cloudy, with a low around 46. Chance of precipitation is 70%.
Friday
A chance of rain. Mostly cloudy, with a high near 59.
Friday Night
A slight chance of rain before 11pm. Partly cloudy, with a low around 42.
Saturday
Partly sunny, with a high near 62.
Saturday Night
Mostly cloudy, with a low around 43.
Sunday
Partly sunny, with a high near 62.
Sunday Night
A slight chance of rain. Mostly cloudy, with a low around 44.
Monday
A chance of rain. Mostly cloudy, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ESE Onalaska WA
 46.55°N 122.66°W (Elev. 600 ft)
Last Update:
11:27 am PDT Sep 21, 2026
Forecast Valid:
8pm PDT Sep 21, 2026-6pm PDT Sep 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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