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

Early Heat Wave in the West; Fire Concerns in the Plains

An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Elevated to critical fire weather conditions are expected today across the High Plains and southern Plains. Lake effect snow downwind of the Great Lakes will taper off today. Read More >

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

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

NA

87°F

31°C

Humidity 19%
Wind Speed WSW 1 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Heat Index84°F (29°C)
Last update 17 Mar 03:52 PM PDT
Extended Forecast for

9 Miles WNW Illinois Valley OR

  • Tonight

    Tonight: Clear, with a low around 53. South southwest wind 5 to 7 mph.

    Low: 53 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 67. South southwest wind 6 to 8 mph.

    High: 67 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 54. Southwest wind around 6 mph.

    Low: 54 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 68. Southwest wind 5 to 7 mph.

    High: 68 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 51. West southwest wind 5 to 8 mph becoming south after midnight.

    Low: 51 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of rain, mainly after 11pm. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain

  • Saturday

    Saturday: A chance of rain, mainly before 11am. Snow level 7000 feet lowering to 5700 feet. Partly sunny, with a high near 54.

    High: 54 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A slight chance of rain before 11pm. Snow level 6000 feet lowering to 4800 feet after midnight . Partly cloudy, with a low around 37.

    Low: 37 °F

    Slight Chance
    Rain then
    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 53. South southwest wind 5 to 7 mph.
Wednesday
Sunny, with a high near 67. South southwest wind 6 to 8 mph.
Wednesday Night
Mostly clear, with a low around 54. Southwest wind around 6 mph.
Thursday
Sunny, with a high near 68. Southwest wind 5 to 7 mph.
Thursday Night
Mostly clear, with a low around 51. West southwest wind 5 to 8 mph becoming south after midnight.
Friday
Mostly sunny, with a high near 66.
Friday Night
A 30 percent chance of rain, mainly after 11pm. Mostly cloudy, with a low around 45.
Saturday
A chance of rain, mainly before 11am. Snow level 7000 feet lowering to 5700 feet. Partly sunny, with a high near 54.
Saturday Night
A slight chance of rain before 11pm. Snow level 6000 feet lowering to 4800 feet after midnight . Partly cloudy, with a low around 37.
Sunday
Mostly sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 39.
Monday
A slight chance of rain. Snow level 5100 feet rising to 5700 feet in the afternoon. Partly sunny, with a high near 55.
Monday Night
A chance of rain and snow. Snow level 5600 feet. Mostly cloudy, with a low around 42.
Tuesday
Rain and snow likely. Snow level 5200 feet lowering to 4600 feet in the afternoon . Mostly cloudy, with a high near 49.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
9 Miles WNW Illinois Valley OR
 42.15°N 123.85°W (Elev. 3356 ft)
Last Update:
4:41 pm PDT Mar 17, 2026
Forecast Valid:
4pm PDT Mar 17, 2026-6pm PDT Mar 24, 2026
 
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Additional Resources

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Chance of Precipitation