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

Hawaii and Guam Concerns; Severe Weather for the Plains; Heavy Snow for Sierra-Nevada

Heavy rainfall capable of causing flash flooding will continue to impact Hawaii through Monday. Severe thunderstorms and heavy rain are possible in parts of Texas and the southern Plains and the Upper Great Lakes. Heavy mountain snow continues in California's Sierra Nevada and rain with gusty winds to lower elevations. Super Typhoon Sinlaku will impact the Marianas through midweek. Read More >

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

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

NA

41°F

5°C

Humidity 92%
Wind Speed SW 1 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility NA
Last update 13 Apr 02:52 AM PDT
Extended Forecast for

17 Miles SSE Agness OR

  • Overnight

    Overnight: A 40 percent chance of showers. Snow level 4600 feet. Mostly cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Chance
    Showers

  • Monday

    Monday: Showers likely before 4pm, then a slight chance of showers after 5pm. Snow level 4500 feet. Mostly cloudy, with a high near 46. Calm wind becoming west northwest 5 to 7 mph in the afternoon. Chance of precipitation is 70%.

    High: 46 °F

    Showers
    Likely

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 37. Northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 37 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers after 11am. Snow level 2900 feet rising to 4100 feet in the afternoon. Partly sunny, with a high near 48. Light south southwest wind becoming southwest 8 to 13 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 48 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers. Snow level 4000 feet rising to 4800 feet after midnight. Low around 40. South southwest wind 14 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Showers

  • Wednesday

    Wednesday: Rain showers before 5pm, then rain, possibly mixed with snow showers. Snow level 5100 feet lowering to 3900 feet in the afternoon . High near 44. Chance of precipitation is 100%. Little or no snow accumulation expected.

    High: 44 °F

    Showers then
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Rain and snow showers before 11pm, then a chance of snow showers. Snow level 3300 feet lowering to 2400 feet after midnight . Low around 34. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 34 °F

    Rain/Snow
    then Chance
    Snow Showers

  • Thursday

    Thursday: A chance of snow before 11am, then a slight chance of rain and snow between 11am and 2pm, then a slight chance of rain after 2pm. Snow level rising to 3400 feet in the afternoon. Mostly sunny, with a high near 48.

    High: 48 °F

    Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

Detailed Forecast

Overnight
A 40 percent chance of showers. Snow level 4600 feet. Mostly cloudy, with a low around 41. Calm wind.
Monday
Showers likely before 4pm, then a slight chance of showers after 5pm. Snow level 4500 feet. Mostly cloudy, with a high near 46. Calm wind becoming west northwest 5 to 7 mph in the afternoon. Chance of precipitation is 70%.
Monday Night
Mostly cloudy, with a low around 37. Northwest wind 5 to 7 mph becoming calm in the evening.
Tuesday
A 30 percent chance of showers after 11am. Snow level 2900 feet rising to 4100 feet in the afternoon. Partly sunny, with a high near 48. Light south southwest wind becoming southwest 8 to 13 mph in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
Showers. Snow level 4000 feet rising to 4800 feet after midnight. Low around 40. South southwest wind 14 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Rain showers before 5pm, then rain, possibly mixed with snow showers. Snow level 5100 feet lowering to 3900 feet in the afternoon . High near 44. Chance of precipitation is 100%. Little or no snow accumulation expected.
Wednesday Night
Rain and snow showers before 11pm, then a chance of snow showers. Snow level 3300 feet lowering to 2400 feet after midnight . Low around 34. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Thursday
A chance of snow before 11am, then a slight chance of rain and snow between 11am and 2pm, then a slight chance of rain after 2pm. Snow level rising to 3400 feet in the afternoon. Mostly sunny, with a high near 48.
Thursday Night
Mostly clear, with a low around 35.
Friday
Mostly sunny, with a high near 59.
Friday Night
Mostly cloudy, with a low around 42.
Saturday
A slight chance of rain. Snow level 4500 feet rising to 5200 feet in the afternoon. Partly sunny, with a high near 57.
Saturday Night
A chance of rain. Snow level 5400 feet. Mostly cloudy, with a low around 45.
Sunday
Rain likely. Snow level 5000 feet lowering to 4200 feet. Mostly cloudy, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
17 Miles SSE Agness OR
 42.32°N 123.96°W (Elev. 2408 ft)
Last Update:
1:01 am PDT Apr 13, 2026
Forecast Valid:
3am PDT Apr 13, 2026-6pm PDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

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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