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

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

ILLINOIS VALLEY AIRPORT (SBFO3)

Lat: 42.10386°NLon: 123.68519°WElev: 1389.0ft.

NA

84°F

29°C

Humidity 24%
Wind Speed ESE 1 MPH
Barometer NA
Dewpoint 43°F (6°C)
Visibility NA
Heat Index82°F (28°C)
Last update 20 Mar 03:52 PM PDT
Extended Forecast for

3 Miles SE Illinois Valley OR

  • Tonight

    Tonight: Mostly cloudy, with a low around 37. Light south southwest wind.

    Low: 37 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 67. North wind 3 to 8 mph.

    High: 67 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Widespread frost after 11pm. Otherwise, mostly clear, with a low around 23. North northeast wind 5 to 9 mph.

    Low: 23 °F

    Frost

  • Sunday

    Sunday: Widespread frost before 11am. Otherwise, mostly sunny, with a high near 69. North wind 3 to 6 mph.

    High: 69 °F

    Frost then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 2am. Otherwise, mostly cloudy, with a low around 31. Northeast wind 3 to 5 mph.

    Low: 31 °F

    Mostly Cloudy
    then Patchy
    Frost

  • Monday

    Monday: Areas of frost before 8am. Otherwise, partly sunny, with a high near 73.

    High: 73 °F

    Areas Frost
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain after 11am. Mostly sunny, with a high near 68.

    High: 68 °F

    Slight Chance
    Rain

  • Tuesday Night

    Tuesday Night: A chance of rain. Mostly cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly cloudy, with a low around 37. Light south southwest wind.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 67. North wind 3 to 8 mph.
Saturday Night
Widespread frost after 11pm. Otherwise, mostly clear, with a low around 23. North northeast wind 5 to 9 mph.
Sunday
Widespread frost before 11am. Otherwise, mostly sunny, with a high near 69. North wind 3 to 6 mph.
Sunday Night
Patchy frost after 2am. Otherwise, mostly cloudy, with a low around 31. Northeast wind 3 to 5 mph.
Monday
Areas of frost before 8am. Otherwise, partly sunny, with a high near 73.
Monday Night
Mostly cloudy, with a low around 35.
Tuesday
A slight chance of rain after 11am. Mostly sunny, with a high near 68.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 36.
Wednesday
A chance of rain, mainly before 11am. Partly sunny, with a high near 58.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Sunny, with a high near 63.
Thursday Night
Mostly clear, with a low around 35.
Friday
Sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Illinois Valley OR
 42.08°N 123.65°W (Elev. 1644 ft)
Last Update:
3:21 pm PDT Mar 20, 2026
Forecast Valid:
4pm PDT Mar 20, 2026-6pm PDT Mar 27, 2026
 
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Additional Resources

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Chance of Precipitation