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Grass Lake, California Weather Forecast
Grass Lake, California Weather
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Weather Forecast for Grass Lake, California : Siskiyou County
Issued: 12:41 am PST Dec 18, 2025 Latitude: 41.6348722 Longitude: -122.1914006 View on Google Maps

MouseOver for Detail Forecast
Overnight Thursday Friday Saturday Sunday Monday Tuesday Wednesday
20% chance of rain & snow on Overnight 50% chance of rain & snow on Thursday 100% chance of rain & snow on Friday 60% chance of rain & snow on Saturday Rain and Snow on Sunday Rain and Snow on Monday Snow on Tuesday Snow on Wednesday
Low: 31°F High: 49°F High: 44°F High: 43°F High: 46°F High: 42°F High: 40°F High: 39°F
Low: 36°F Low: 29°F Low: 34°F Low: 32°F Low: 27°F Low: 28°F  
Rain & Snow Rain & Snow Rain & Snow Rain & Snow Rain and Snow Rain and Snow Snow Snow
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Current Conditions at
MONTAGUE/SSK - (KSIY)
39°
Cloudy
as of 12:53 AM PST
Rel. Humidity: 86%
Dew Point: 36°F
Visibility: 10 Miles
Pressure: 30.16 in.
Flight Rule: VFR
Wind Data
3 MPH
160° South
Cloud Level(s): Solid Overcast at 6500ft
Current Conditions at
MT SHASTA - (KMHS)
39°
Cloudy
as of 12:56 AM PST
Rel. Humidity: 100%
Dew Point: 39°F
Visibility: 10 Miles
Pressure: 30.13 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Few at 300ft, Scattered at 6500ft, Solid Overcast at 8500ft
Current Conditions at
KLAMATH FALLS - (KLMT)
34°
Cloudy
as of 12:53 AM PST
Rel. Humidity: 86%
Dew Point: 30°F
Visibility: 10 Miles
Pressure: 30.11 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Broken at 7500ft, Solid Overcast at 9000ft
Current Conditions at
MEDFORD - (KMFR)
43°
Cloudy
Light Rain
as of 12:53 AM PST
Rel. Humidity: 86%
Dew Point: 39°F
Visibility: 10 Miles
Pressure: 30.14 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Broken at 5000ft, Solid Overcast at 7000ft
20% chance of rain & snow Overnight Overnight... A 20 percent chance of rain before 2am. Snow level 6500 feet rising to 9000 feet. Cloudy, with a low around 31. Southwest wind around 14 mph, with gusts as high as 21 mph.

50% chance of rain & snow Thursday Thursday... A 50 percent chance of rain after 10am. Snow level 9700 feet lowering to 7600 feet in the afternoon . Cloudy, then gradually becoming mostly sunny, with a high near 49. Breezy, with a south southwest wind 18 to 22 mph, with gusts as high as 33 mph.

90% chance of rain & snow Thursday Night Thursday Night... Rain, mainly after 10pm. Snow level 6300 feet rising to 7000 feet after midnight. Low around 36. Breezy, with a southwest wind 21 to 23 mph, with gusts as high as 36 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

100% chance of rain & snow Friday Friday... Rain. Snow level 7400 feet. High near 44. Breezy, with a south southwest wind around 23 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

70% chance of rain & snow Friday Night Friday Night... Rain and snow likely before 10pm, then a chance of snow. Mostly cloudy, with a low around 29. West southwest wind 13 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

60% chance of rain & snow Saturday Saturday... A chance of snow before 4pm, then rain likely, possibly mixed with snow. Mostly cloudy, with a high near 43. Chance of precipitation is 60%. Little or no snow accumulation expected.

80% chance of rain & snow Saturday Night Saturday Night... Rain, possibly mixed with snow, becoming all rain after 1am. Snow level 5900 feet rising to 6500 feet after midnight. Low around 34. Chance of precipitation is 80%. Little or no snow accumulation expected.

Rain and Snow on Sunday Sunday... Rain. Snow level 7100 feet. Cloudy, with a high near 46.

Rain and Snow on Sunday Night Sunday Night... Rain before 1am, then snow, possibly mixed with rain. Snow level 6700 feet. Cloudy, with a low around 32.

Rain and Snow on Monday Monday... Rain and snow likely, becoming all snow after 7am. Snow level 5600 feet. Mostly cloudy, with a high near 42.

20% chance of snow Monday Night Monday Night... A chance of snow. Mostly cloudy, with a low around 27.

Snow on Tuesday Tuesday... Snow likely. Partly sunny, with a high near 40.

Snow on Tuesday Night Tuesday Night... Snow likely. Mostly cloudy, with a low around 28.

Snow on Wednesday Wednesday... Snow likely. Mostly cloudy, with a high near 39.

Current Radar Image


Sun Almanac for Grass Lake, California
Sunrise: 07:31 AM
Sunset: 4:40 PM
Civil Sunrise:06:59 AM
Civil Sunset: 5:12 PM
Nautical Sunrise: 06:24 AM
Nautical Sunset: 5:47 PM
Astro Sunrise: 05:51 AM
Astro Sunset: 6:21 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.