Hawaii and Guam Concerns; Record Warmth Spreads Eastward; Heavy Snow for Sierra-Nevada; Severe Weather for the Plains

A very active spring pattern with tropical concerns across the Pacific. Heavy rainfall will continue to impact Hawaii this weekend. Meanwhile we continue to monitor a developing typhoon that may affect Guam into early next week. For the Lower 48, heavy snow for mountains of California this weekend, increase threat for severe thunderstorms next week for the Plains and record warmth spreads east. Read More >

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

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

NA

41°F

5°C

Humidity 100%
Wind Speed N 2 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 12 Apr 07:52 AM PDT
Extended Forecast for

16 Miles SE Agness OR

  • Today

    Today: Rain, mainly before 5pm.  Snow level 4000 feet rising to 4900 feet in the afternoon. High near 48. Calm wind becoming west 5 to 8 mph in the afternoon.  Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Chance Rain
    then Rain

  • Tonight

    Tonight: Rain likely, mainly before 4am.  Snow level 4600 feet. Mostly cloudy, with a low around 43. West wind 6 to 8 mph.  Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 43 °F

    Rain Likely

  • Monday

    Monday: Rain likely.  Snow level 4200 feet rising to 4700 feet in the afternoon. Mostly cloudy, with a high near 47. West wind around 6 mph.  Chance of precipitation is 70%.

    High: 47 °F

    Rain Likely

  • Monday Night

    Monday Night: A 30 percent chance of rain before 11pm.  Snow level 4800 feet lowering to 3800 feet after midnight . Mostly cloudy, with a low around 40. West northwest wind around 6 mph becoming calm  in the evening.

    Low: 40 °F

    Chance Rain
    then Mostly
    Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of rain after 11am.  Snow level 3500 feet rising to 4200 feet in the afternoon. Partly sunny, with a high near 49. Light west wind becoming west southwest 5 to 10 mph in the afternoon.

    High: 49 °F

    Slight Chance
    Rain

  • Tuesday Night

    Tuesday Night: Rain.  Snow level 4300 feet. Low around 43. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 43 °F

    Rain

  • Wednesday

    Wednesday: Rain.  Snow level 5000 feet lowering to 4200 feet in the afternoon . High near 44. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 44 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain likely before 8pm, then snow likely.  Mostly cloudy, with a low around 33.

    Low: 33 °F

    Rain/Snow
    Likely then
    Chance Snow

  • Thursday

    Thursday: A slight chance of snow before 11am.  Mostly sunny, with a high near 50.

    High: 50 °F

    Slight Chance
    Snow then
    Sunny

Detailed Forecast

Today
Rain, mainly before 5pm. Snow level 4000 feet rising to 4900 feet in the afternoon. High near 48. Calm wind becoming west 5 to 8 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Rain likely, mainly before 4am. Snow level 4600 feet. Mostly cloudy, with a low around 43. West wind 6 to 8 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Rain likely. Snow level 4200 feet rising to 4700 feet in the afternoon. Mostly cloudy, with a high near 47. West wind around 6 mph. Chance of precipitation is 70%.
Monday Night
A 30 percent chance of rain before 11pm. Snow level 4800 feet lowering to 3800 feet after midnight . Mostly cloudy, with a low around 40. West northwest wind around 6 mph becoming calm in the evening.
Tuesday
A 20 percent chance of rain after 11am. Snow level 3500 feet rising to 4200 feet in the afternoon. Partly sunny, with a high near 49. Light west wind becoming west southwest 5 to 10 mph in the afternoon.
Tuesday Night
Rain. Snow level 4300 feet. Low around 43. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Rain. Snow level 5000 feet lowering to 4200 feet in the afternoon . High near 44. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday Night
Rain likely before 8pm, then snow likely. Mostly cloudy, with a low around 33.
Thursday
A slight chance of snow before 11am. Mostly sunny, with a high near 50.
Thursday Night
Mostly clear, with a low around 35.
Friday
Sunny, with a high near 58.
Friday Night
Partly cloudy, with a low around 40.
Saturday
Mostly sunny, with a high near 60.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
16 Miles SE Agness OR
 42.4°N 123.83°W (Elev. 2582 ft)
4:41 am PDT Apr 12, 2026
8am PDT Apr 12, 2026-6pm PDT Apr 18, 2026
 
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Additional Resources

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