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

48°F

9°C

Humidity 97%
Wind Speed NNE 0 MPH
Barometer NA
Dewpoint 47°F (8°C)
Visibility NA
Last update 01 Jan 03:52 PM PST
Extended Forecast for

12 Miles W Happy Camp CA

Winter Storm Watch January 3, 04:00pm until January 4, 10:00pm
Click here for hazard details and duration
Winter Storm Watch

  • New Year's Day

    New Year's Day: Rain. Snow level 7800 feet. High near 42. South wind around 11 mph. Chance of precipitation is 100%.

    High: 42 °F

    Rain

  • Tonight

    Tonight: Rain, mainly before 5am. Snow level 7700 feet lowering to 7200 feet after midnight . Low around 39. South wind around 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 39 °F

    Rain

  • Friday

    Friday: Rain, mainly after 4pm. Snow level 6800 feet lowering to 6300 feet in the afternoon . High near 42. Southeast wind around 14 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.

    High: 42 °F

    Chance Rain
    then Rain

  • Friday Night

    Friday Night: Rain before 1am, then rain, possibly mixed with snow between 1am and 4am, then rain after 4am. Snow level 6500 feet lowering to 5900 feet after midnight . Low around 37. Southeast wind 16 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. 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 20 to 22 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.

    High: 38 °F

    Rain/Snow and
    Breezy

  • Saturday Night

    Saturday Night: Rain and snow. The rain and snow could be heavy at times. Snow level 5300 feet. Low around 33. Breezy. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    Low: 33 °F

    Rain/Snow and
    Breezy

  • Sunday

    Sunday: Snow. The snow could be heavy at times. High near 34. Chance of precipitation is 100%. New snow accumulation of 5 to 9 inches possible.

    High: 34 °F

    Heavy Snow

  • Sunday Night

    Sunday Night: Snow. Cloudy, with a low around 29.

    Low: 29 °F

    Snow

  • Monday

    Monday: Snow, mainly before 4pm. Mostly cloudy, with a high near 34.

    High: 34 °F

    Snow

Detailed Forecast

New Year's Day
Rain. Snow level 7800 feet. High near 42. South wind around 11 mph. Chance of precipitation is 100%.
Tonight
Rain, mainly before 5am. Snow level 7700 feet lowering to 7200 feet after midnight . Low around 39. South wind around 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain, mainly after 4pm. Snow level 6800 feet lowering to 6300 feet in the afternoon . High near 42. Southeast wind around 14 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.
Friday Night
Rain before 1am, then rain, possibly mixed with snow between 1am and 4am, then rain after 4am. Snow level 6500 feet lowering to 5900 feet after midnight . Low around 37. Southeast wind 16 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Saturday
Rain, possibly mixed with snow. Snow level 5400 feet. High near 38. Breezy, with a south wind 20 to 22 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Saturday Night
Rain and snow. The rain and snow could be heavy at times. Snow level 5300 feet. Low around 33. Breezy. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Sunday
Snow. The snow could be heavy at times. High near 34. Chance of precipitation is 100%. New snow accumulation of 5 to 9 inches possible.
Sunday Night
Snow. Cloudy, with a low around 29.
Monday
Snow, mainly before 4pm. Mostly cloudy, with a high near 34.
Monday Night
A chance of snow, mainly before 10pm. Mostly cloudy, with a low around 30.
Tuesday
A chance of snow. Partly sunny, with a high near 37.
Tuesday Night
Snow likely. Mostly cloudy, with a low around 33.
Wednesday
Snow likely. Mostly cloudy, with a high near 34.
Wednesday Night
Snow likely. Mostly cloudy, with a low around 29.
Thursday
A chance of snow. Partly sunny, with a high near 34.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
12 Miles W Happy Camp CA
 41.79°N 123.59°W (Elev. 5000 ft)
Last Update:
3:41 pm PST Jan 1, 2026
Forecast Valid:
4pm PST Jan 1, 2026-6pm PST Jan 8, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation