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

Montague Siskiyou County Airport (KSIY)

Lat: 41.77375°NLon: 122.46817°WElev: 2644.0ft.

Clear

60°F

16°C

Humidity 57%
Wind Speed N 8 MPH
Barometer 30.08 in (1018.63 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 21 Mar 09:53 AM PDT
Extended Forecast for

Montague CA

  • Today

    Today: Mostly sunny, with a high near 70. Light north wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 23 mph.

    High: 70 °F

    Mostly Sunny

  • Tonight

    Tonight: Widespread frost, mainly after 2am.  Otherwise, partly cloudy, with a low around 32. North wind 11 to 16 mph becoming light  after midnight. Winds could gust as high as 24 mph.

    Low: 32 °F

    Frost

  • Sunday

    Sunday: Widespread frost before 11am.  Otherwise, mostly sunny, with a high near 68. Calm wind.

    High: 68 °F

    Frost then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Areas of frost after 5am.  Otherwise, partly cloudy, with a low around 36. Light north northwest wind.

    Low: 36 °F

    Partly Cloudy
    then Areas
    Frost

  • Monday

    Monday: Areas of frost before 8am.  Otherwise, mostly sunny, with a high near 72. Calm wind becoming west around 6 mph in the afternoon.

    High: 72 °F

    Areas Frost
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of rain.  Partly sunny, with a high near 70.

    High: 70 °F

    Slight Chance
    Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 70. Light north wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 23 mph.
Tonight
Widespread frost, mainly after 2am. Otherwise, partly cloudy, with a low around 32. North wind 11 to 16 mph becoming light after midnight. Winds could gust as high as 24 mph.
Sunday
Widespread frost before 11am. Otherwise, mostly sunny, with a high near 68. Calm wind.
Sunday Night
Areas of frost after 5am. Otherwise, partly cloudy, with a low around 36. Light north northwest wind.
Monday
Areas of frost before 8am. Otherwise, mostly sunny, with a high near 72. Calm wind becoming west around 6 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 39.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 70.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 66.
Wednesday Night
Partly cloudy, with a low around 33.
Thursday
Mostly sunny, with a high near 62.
Thursday Night
Partly cloudy, with a low around 31.
Friday
Sunny, with a high near 69.
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ABOUT THIS FORECAST

 
Point Forecast:
Montague CA
 41.72°N 122.53°W (Elev. 2598 ft)
4:41 am PDT Mar 21, 2026
10am 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