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

Lake Effect Snow through Friday; Heavy Rain, Thunderstorms and Mountain Snow in California

Periods of moderate to heavy lake effect snow will continue through Friday downwind of Lake Erie and Ontario. Several additional inches of accumulating snow are expected. A Pacific storm will bring heavy rain and mountain snow across California, the Southwest and Intermountain West today. Isolated severe thunderstorms and scattered flash flooding is possible across parts of southern California. Read More >

Hazardous Weather Conditions

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

Lat: 42.10375°NLon: 123.68508°WElev: 1389.0ft.

NA

42°F

6°C

Humidity 99%
Wind Speed NNE 0 MPH
Barometer NA
Dewpoint 42°F (6°C)
Visibility NA
Last update 01 Jan 06:52 AM PST
Extended Forecast for

12 Miles NNE Happy Camp CA

Winter Storm Watch January 2, 10:00pm until January 4, 10:00pm
Click here for hazard details and duration
Winter Storm Watch

  • New Year's Day

    New Year's Day: Rain, mainly after 1pm. High near 42. South wind around 10 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 42 °F

    Chance Rain
    then Rain

  • Tonight

    Tonight: Rain, mainly before 2am. Snow level 7900 feet lowering to 7200 feet after midnight . Low around 39. South wind 14 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 39 °F

    Rain

  • Friday

    Friday: Rain likely, mainly after 4pm. Snow level 7100 feet lowering to 6600 feet in the afternoon . Mostly cloudy, with a high near 42. South southeast wind 13 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.

    High: 42 °F

    Rain Likely

  • Friday Night

    Friday Night: Rain before 1am, then rain, possibly mixed with snow. Snow level 6100 feet. Low around 37. South southeast wind around 21 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    Low: 37 °F

    Rain then
    Rain/Snow

  • Saturday

    Saturday: Rain, possibly mixed with snow. Snow level 5400 feet. High near 38. Breezy, with a south wind 21 to 24 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

    High: 38 °F

    Rain/Snow and
    Breezy

  • Saturday Night

    Saturday Night: Rain and snow. Snow level 5300 feet. Low around 34. Breezy. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.

    Low: 34 °F

    Rain/Snow and
    Breezy

  • Sunday

    Sunday: Snow. High near 35. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

    High: 35 °F

    Snow

  • Sunday Night

    Sunday Night: Snow. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Snow

  • Monday

    Monday: Snow likely. Mostly cloudy, with a high near 34.

    High: 34 °F

    Snow Likely

Detailed Forecast

New Year's Day
Rain, mainly after 1pm. High near 42. South wind around 10 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tonight
Rain, mainly before 2am. Snow level 7900 feet lowering to 7200 feet after midnight . Low around 39. South wind 14 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain likely, mainly after 4pm. Snow level 7100 feet lowering to 6600 feet in the afternoon . Mostly cloudy, with a high near 42. South southeast wind 13 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.
Friday Night
Rain before 1am, then rain, possibly mixed with snow. Snow level 6100 feet. Low around 37. South southeast wind around 21 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Saturday
Rain, possibly mixed with snow. Snow level 5400 feet. High near 38. Breezy, with a south wind 21 to 24 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Saturday Night
Rain and snow. Snow level 5300 feet. Low around 34. Breezy. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Sunday
Snow. High near 35. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.
Sunday Night
Snow. Mostly cloudy, with a low around 32.
Monday
Snow likely. Mostly cloudy, with a high near 34.
Monday Night
A chance of snow, mainly before 4am. Mostly cloudy, with a low around 30.
Tuesday
A chance of snow. Partly sunny, with a high near 36.
Tuesday Night
A chance of snow. Mostly cloudy, with a low around 30.
Wednesday
Snow likely. Partly sunny, with a high near 36.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
12 Miles NNE Happy Camp CA
 41.96°N 123.25°W (Elev. 5138 ft)
Last Update:
4:41 am PST Jan 1, 2026
Forecast Valid:
7am PST Jan 1, 2026-6pm PST Jan 7, 2026
 
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Additional Resources

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Chance of Precipitation