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

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 >

Hazardous Weather Conditions

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

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

NA

43°F

6°C

Humidity 99%
Wind Speed NNE 3 MPH
Barometer NA
Dewpoint 43°F (6°C)
Visibility NA
Last update 11 Apr 08:52 PM PDT
Extended Forecast for

13 Miles NE Happy Camp CA

Winter Weather Advisory until April 12, 11:00am
Click here for hazard details and duration
Winter Weather Advisory
  •  
    Winter Weather Advisory until April 12, 11:00am

    NOW until 11:00am Sun

    Winter Weather Advisory

  • Tonight

    Low: 34 °F

    Snow Showers
    Likely

  • Sunday

    Sunday: Snow showers, mainly after 9am. Some thunder is also possible. Steady temperature around 33. South southeast wind 5 to 7 mph becoming west in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 33 °F

    Chance Snow
    Showers then
    Snow Showers

  • Sunday Night

    Sunday Night: Snow showers, mainly before 11pm. Low around 33. West wind 5 to 8 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 33 °F

    Snow Showers
    then Chance
    Snow Showers

  • Monday

    Monday: Snow showers likely, mainly after 11am. Mostly cloudy, with a high near 37. West wind around 5 mph becoming calm. Winds could gust as high as 21 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 37 °F

    Snow Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of snow showers before 11pm. Mostly cloudy, with a low around 34. Light west northwest wind becoming northwest 5 to 10 mph in the evening. Winds could gust as high as 21 mph. Little or no snow accumulation expected.

    Low: 34 °F

    Chance Snow
    Showers then
    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of rain after 5pm. Mostly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: A chance of rain and snow before 8pm, then a chance of snow. Mostly cloudy, with a low around 34. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    Low: 34 °F

    Chance
    Rain/Snow
    then Chance
    Snow

  • Wednesday

    Wednesday: Snow before 8am, then snow, possibly mixed with rain. Cloudy, with a high near 35.

    High: 35 °F

    Rain/Snow

Detailed Forecast

Tonight
Snow showers likely. Mostly cloudy, with a steady temperature around 34. South southeast wind 3 to 8 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of less than one inch possible.
Sunday
Snow showers, mainly after 9am. Some thunder is also possible. Steady temperature around 33. South southeast wind 5 to 7 mph becoming west in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Sunday Night
Snow showers, mainly before 11pm. Low around 33. West wind 5 to 8 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Monday
Snow showers likely, mainly after 11am. Mostly cloudy, with a high near 37. West wind around 5 mph becoming calm. Winds could gust as high as 21 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Monday Night
A 30 percent chance of snow showers before 11pm. Mostly cloudy, with a low around 34. Light west northwest wind becoming northwest 5 to 10 mph in the evening. Winds could gust as high as 21 mph. Little or no snow accumulation expected.
Tuesday
A 30 percent chance of rain after 5pm. Mostly sunny, with a high near 43.
Tuesday Night
A chance of rain and snow before 8pm, then a chance of snow. Mostly cloudy, with a low around 34. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
Wednesday
Snow before 8am, then snow, possibly mixed with rain. Cloudy, with a high near 35.
Wednesday Night
Rain and snow likely, becoming all snow after 8pm. Mostly cloudy, with a low around 25.
Thursday
Sunny, with a high near 38.
Thursday Night
Mostly clear, with a low around 27.
Friday
Sunny, with a high near 49.
Friday Night
Partly cloudy, with a low around 35.
Saturday
A chance of rain. Snow level rising to 6700 feet in the afternoon. Mostly sunny, with a high near 51.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
13 Miles NE Happy Camp CA
 41.93°N 123.18°W (Elev. 5801 ft)
Last Update:
4:41 pm PDT Apr 11, 2026
Forecast Valid:
10pm PDT Apr 11, 2026-6pm PDT Apr 18, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation