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

Heat Wave Continues in the West; Critical Fire Weather Conditions in the High 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. Critical fire weather conditions will continue over the next couple of days across portions of the High Plains as gusty winds and dry conditions persist. Read More >

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

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

NA

86°F

30°C

Humidity 12%
Wind Speed W 3 MPH
Barometer NA
Dewpoint 28°F (-2°C)
Visibility NA
Heat Index83°F (28°C)
Last update 18 Mar 03:52 PM PDT
Extended Forecast for

17 Miles SSE Agness OR

  • Tonight

    Tonight: Mostly clear, with a low around 56. Southwest wind 5 to 7 mph becoming southeast in the evening.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 69. South southeast wind 6 to 10 mph becoming southwest in the afternoon.

    High: 69 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58. South southeast wind 6 to 8 mph.

    Low: 58 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 64. Light and variable wind becoming west southwest 5 to 7 mph in the afternoon.

    High: 64 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 11pm. Mostly cloudy, with a low around 48. North northwest wind around 7 mph.

    Low: 48 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before 11am. Snow level 6600 feet lowering to 5000 feet. Partly sunny, with a high near 55.

    High: 55 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 56. Southwest wind 5 to 7 mph becoming southeast in the evening.
Thursday
Sunny, with a high near 69. South southeast wind 6 to 10 mph becoming southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 58. South southeast wind 6 to 8 mph.
Friday
Mostly sunny, with a high near 64. Light and variable wind becoming west southwest 5 to 7 mph in the afternoon.
Friday Night
A 20 percent chance of showers after 11pm. Mostly cloudy, with a low around 48. North northwest wind around 7 mph.
Saturday
A 20 percent chance of showers before 11am. Snow level 6600 feet lowering to 5000 feet. Partly sunny, with a high near 55.
Saturday Night
Partly cloudy, with a low around 42.
Sunday
Sunny, with a high near 58.
Sunday Night
Mostly cloudy, with a low around 42.
Monday
Partly sunny, with a high near 60.
Monday Night
A chance of showers. Mostly cloudy, with a low around 47.
Tuesday
Showers likely. Mostly cloudy, with a high near 57.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 43.
Wednesday
Showers likely. Snow level 5700 feet lowering to 4900 feet in the afternoon . Mostly cloudy, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
17 Miles SSE Agness OR
 42.32°N 123.96°W (Elev. 2408 ft)
Last Update:
3:21 pm PDT Mar 18, 2026
Forecast Valid:
4pm PDT Mar 18, 2026-6pm PDT Mar 25, 2026
 
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