Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Current conditions at

CASTLE ROCK (TR950)

Lat: 46.27139°NLon: 122.89194°WElev: 213.0ft.

NA

47°F

8°C

Humidity 92%
Wind Speed NNE 3 MPH
Barometer NA
Dewpoint 45°F (7°C)
Visibility NA
Last update 21 Mar 01:09 AM PDT
Extended Forecast for

11 Miles NW Mount St Helens WA

  • Overnight

    Overnight: A 20 percent chance of snow before 3am.  Mostly cloudy, with a low around 28. West northwest wind around 7 mph.

    Low: 28 °F

    Slight Chance
    Snow

  • Saturday

    Saturday: Mostly sunny, with a high near 37. West northwest wind 5 to 10 mph.

    High: 37 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming clear, with a low around 27. West northwest wind 5 to 8 mph becoming calm.

    Low: 27 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 43. Light and variable wind becoming northwest 5 to 7 mph in the afternoon.

    High: 43 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 30. Northwest wind 5 to 9 mph becoming north northeast after midnight.

    Low: 30 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

  • Monday Night

    Monday Night: Snow, possibly mixed with rain.  Snow level 4200 feet. Low around 36. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 36 °F

    Rain/Snow

  • Tuesday

    Tuesday: Rain, possibly mixed with snow, becoming all rain after 2pm.  Snow level 5000 feet rising to 5900 feet in the afternoon. Cloudy, with a high near 41. Breezy.

    High: 41 °F

    Rain/Snow and
    Breezy

  • Tuesday Night

    Tuesday Night: Rain before 8pm, then rain and snow between 8pm and 2am, then snow likely after 2am.  Snow level 5600 feet lowering to 3700 feet after midnight . Cloudy, with a low around 32. Breezy.

    Low: 32 °F

    Rain/Snow and
    Breezy

Detailed Forecast

Overnight
A 20 percent chance of snow before 3am. Mostly cloudy, with a low around 28. West northwest wind around 7 mph.
Saturday
Mostly sunny, with a high near 37. West northwest wind 5 to 10 mph.
Saturday Night
Mostly cloudy, then gradually becoming clear, with a low around 27. West northwest wind 5 to 8 mph becoming calm.
Sunday
Mostly sunny, with a high near 43. Light and variable wind becoming northwest 5 to 7 mph in the afternoon.
Sunday Night
Mostly cloudy, with a low around 30. Northwest wind 5 to 9 mph becoming north northeast after midnight.
Monday
Partly sunny, with a high near 45.
Monday Night
Snow, possibly mixed with rain. Snow level 4200 feet. Low around 36. Chance of precipitation is 80%. Little or no snow accumulation expected.
Tuesday
Rain, possibly mixed with snow, becoming all rain after 2pm. Snow level 5000 feet rising to 5900 feet in the afternoon. Cloudy, with a high near 41. Breezy.
Tuesday Night
Rain before 8pm, then rain and snow between 8pm and 2am, then snow likely after 2am. Snow level 5600 feet lowering to 3700 feet after midnight . Cloudy, with a low around 32. Breezy.
Wednesday
Snow. Cloudy, with a high near 40. Breezy.
Wednesday Night
Snow. Mostly cloudy, with a low around 28. Breezy.
Thursday
Snow likely. Partly sunny, with a high near 39.
Thursday Night
A slight chance of snow. Partly cloudy, with a low around 27.
Friday
A slight chance of rain and snow. Mostly sunny, with a high near 45.
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ABOUT THIS FORECAST

 
Point Forecast:
11 Miles NW Mount St Helens WA
 46.31°N 122.34°W (Elev. 3691 ft)
2:01 am PDT Mar 21, 2026
2am PDT Mar 21, 2026-6pm PDT Mar 27, 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