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

Montague Siskiyou County Airport (KSIY)

Lat: 41.77375°NLon: 122.46817°WElev: 2644.0ft.

Overcast

46°F

8°C

Humidity 92%
Wind Speed NNE 5 MPH
Barometer 29.81 in (1009.48 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 01 Jan 12:53 PM PST
Extended Forecast for

17 Miles NNE Weed 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. High near 46. West wind around 7 mph. Chance of precipitation is 80%.

    High: 46 °F

    Rain

  • Tonight

    Tonight: A 50 percent chance of rain. Snow level 7100 feet. Mostly cloudy, with a low around 34. West northwest wind around 7 mph.

    Low: 34 °F

    Chance Rain

  • Friday

    Friday: Rain likely, mainly after 4pm. Snow level 7000 feet lowering to 6300 feet in the afternoon . Mostly cloudy, with a high near 45. East wind 6 to 10 mph becoming south in the afternoon. Chance of precipitation is 60%.

    High: 45 °F

    Chance Rain
    then Rain
    Likely

  • Friday Night

    Friday Night: Rain. Snow level 6500 feet. Low around 35. South southeast wind 13 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Rain

  • Saturday

    Saturday: Rain. Snow level 5900 feet. High near 43. Breezy, with a south southeast wind 13 to 23 mph, with gusts as high as 34 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 43 °F

    Rain and
    Breezy

  • Saturday Night

    Saturday Night: Rain before 1am, then rain, possibly mixed with snow. Snow level 5600 feet. Low around 34. Breezy. Chance of precipitation is 90%. Little or no snow accumulation expected.

    Low: 34 °F

    Breezy. Rain
    then
    Rain/Snow

  • Sunday

    Sunday: Rain and snow. Snow level 5100 feet. High near 41. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 41 °F

    Rain/Snow

  • Sunday Night

    Sunday Night: Snow. Mostly cloudy, with a low around 30.

    Low: 30 °F

    Snow

  • Monday

    Monday: Snow likely, mainly before 4pm. Mostly cloudy, with a high near 38.

    High: 38 °F

    Snow Likely

Detailed Forecast

New Year's Day
Rain. High near 46. West wind around 7 mph. Chance of precipitation is 80%.
Tonight
A 50 percent chance of rain. Snow level 7100 feet. Mostly cloudy, with a low around 34. West northwest wind around 7 mph.
Friday
Rain likely, mainly after 4pm. Snow level 7000 feet lowering to 6300 feet in the afternoon . Mostly cloudy, with a high near 45. East wind 6 to 10 mph becoming south in the afternoon. Chance of precipitation is 60%.
Friday Night
Rain. Snow level 6500 feet. Low around 35. South southeast wind 13 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Rain. Snow level 5900 feet. High near 43. Breezy, with a south southeast wind 13 to 23 mph, with gusts as high as 34 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Rain before 1am, then rain, possibly mixed with snow. Snow level 5600 feet. Low around 34. Breezy. Chance of precipitation is 90%. Little or no snow accumulation expected.
Sunday
Rain and snow. Snow level 5100 feet. High near 41. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Sunday Night
Snow. Mostly cloudy, with a low around 30.
Monday
Snow likely, mainly before 4pm. Mostly cloudy, with a high near 38.
Monday Night
A chance of snow, mainly before 10pm. Mostly cloudy, with a low around 25.
Tuesday
A slight chance of snow. Partly sunny, with a high near 41.
Tuesday Night
A chance of snow. Mostly cloudy, with a low around 25.
Wednesday
A chance of snow. Partly sunny, with a high near 38.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
17 Miles NNE Weed CA
 41.61°N 122.2°W (Elev. 4941 ft)
Last Update:
11:46 am PST Jan 1, 2026
Forecast Valid:
1pm PST Jan 1, 2026-6pm PST Jan 7, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation