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Guerneville, California Weather Forecast
Guerneville, California Weather
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Click for Dense Fog Advisory for Guerneville, California
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Weather Forecast for Guerneville, California : Sonoma County
Issued: 2:08 am PST Dec 18, 2025 Latitude: 38.5018575 Longitude: -122.9961102 View on Google Maps

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Overnight Thursday Friday Saturday Sunday Monday Tuesday Wednesday
Fog on Overnight 20% chance of rain on Thursday 100% chance of rain on Friday 70% chance of rain on Saturday Rain on Sunday 70% chance of rain on Monday 70% chance of rain on Tuesday 70% chance of rain on Wednesday
Low: 44°F High: 57°F High: 56°F High: 55°F High: 57°F High: 56°F High: 53°F High: 54°F
Low: 51°F Low: 49°F Low: 51°F Low: 49°F Low: 45°F Low: 45°F  
Fog Rain Rain Rain Rain Rain Rain Rain
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Current Conditions at
SANTA ROSA - (KSTS)
41°
Mostly Clear
Fog
as of 1:53 AM PST
Rel. Humidity: 100%
Dew Point: 41°F
Visibility: 1/4 Miles
Pressure: 30.15 in.
Flight Rule: IFR
Wind Data
Calm
Current Conditions at
NAPA - (KAPC)
48°
Cloudy
as of 2:18 AM PST
Rel. Humidity: 100%
Dew Point: 48°F
Visibility: 7 Miles
Pressure: 30.15 in.
Flight Rule: LIFR
Wind Data
Calm
Cloud Level(s): Broken at 300ft, Solid Overcast at 1500ft
Current Conditions at
UKIAH - (KUKI)
45°
Clear
Fog
as of 2:11 AM PST
Rel. Humidity: 100%
Dew Point: 45°F
Visibility: 1/2 Miles
Pressure: 30.15 in.
Flight Rule: IFR
Wind Data
Calm
Current Conditions at
VACAVILLE - (KVCB)
54°
Cloudy
as of 2:29 AM PST
Rel. Humidity: 87%
Dew Point: 50°F
Visibility: 10 Miles
Pressure: 30.16 in.
Flight Rule: IFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 900ft
Fog on Overnight Overnight... Areas of fog. Otherwise, mostly cloudy, with a low around 44. Calm wind.
20% chance of rain Thursday Thursday... A 20 percent chance of rain after 10am. Patchy fog before noon, then patchy fog after 5pm. Otherwise, mostly cloudy, with a high near 57. Light and variable wind.
80% chance of rain Thursday Night Thursday Night... Rain. Patchy fog. Low around 51. Calm wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
100% chance of rain Friday Friday... Rain. High near 56. South southwest wind 5 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
70% chance of rain Friday Night Friday Night... Rain likely, mainly before 10pm. Patchy fog after 1am. Otherwise, cloudy, with a low around 49. Light west northwest wind. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
70% chance of rain Saturday Saturday... Rain likely, mainly after 10am. Patchy dense fog before 10am. Otherwise, cloudy, with a high near 55. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
100% chance of rain Saturday Night Saturday Night... Rain. Low around 51. Chance of precipitation is 100%.
Rain on Sunday Sunday... Rain. The rain could be heavy at times. Cloudy, with a high near 57.
Rain on Sunday Night Sunday Night... Rain. Cloudy, with a low around 49.
70% chance of rain Monday Monday... Rain likely. Mostly cloudy, with a high near 56.
70% chance of rain Monday Night Monday Night... Rain likely. Cloudy, with a low around 45.
70% chance of rain Tuesday Tuesday... Rain likely. Mostly cloudy, with a high near 53.
70% chance of rain Tuesday Night Tuesday Night... Rain likely. Cloudy, with a low around 45.
70% chance of rain Wednesday Wednesday... Rain likely. Mostly cloudy, with a high near 54.
Current Radar Image


Sun Almanac for Guerneville, California
Sunrise: 07:24 AM
Sunset: 4:53 PM
Civil Sunrise:06:55 AM
Civil Sunset: 5:23 PM
Nautical Sunrise: 06:21 AM
Nautical Sunset: 5:56 PM
Astro Sunrise: 05:49 AM
Astro Sunset: 6:29 PM
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