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Howell Mountain, California Weather Forecast
Howell Mountain, California Weather
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Weather Forecast for Howell Mountain, California : Napa County
Issued: 12:26 am PST Dec 18, 2025 Latitude: 38.5812957 Longitude: -122.4510907 View on Google Maps

MouseOver for Detail Forecast
Overnight Thursday Friday Saturday Sunday Monday Tuesday Wednesday
Morning Fog on Overnight 30% chance of rain on Thursday 90% chance of rain on Friday 60% 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: 45°F High: 55°F High: 55°F High: 54°F High: 55°F High: 52°F High: 49°F High: 50°F
Low: 51°F Low: 49°F Low: 51°F Low: 48°F Low: 46°F Low: 46°F  
Morning Fog Rain Rain Rain Rain Rain Rain Rain
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Current Conditions at
SANTA ROSA - (KSTS)
41°
Mostly Cloudy
Fog
as of 12:53 AM PST
Rel. Humidity: 100%
Dew Point: 41°F
Visibility: 1/2 Miles
Pressure: 30.15 in.
Flight Rule: IFR
Wind Data
Calm
Current Conditions at
NAPA - (KAPC)
46°
Cloudy
Mist
as of 12:54 AM PST
Rel. Humidity: 100%
Dew Point: 46°F
Visibility: 5 Miles
Pressure: 30.16 in.
Flight Rule: LIFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 200ft
Current Conditions at
VACAVILLE - (KVCB)
54°
Cloudy
as of 12:53 AM PST
Rel. Humidity: 87%
Dew Point: 50°F
Visibility: 10 Miles
Pressure: 30.16 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 1600ft
Current Conditions at
TRAVIS AFB - (KSUU)
54°
Cloudy
Mist
as of 12:55 AM PST
Rel. Humidity: 87%
Dew Point: 50°F
Visibility: 4 Miles
Pressure: 30.14 in.
Flight Rule: IFR
Wind Data
3 MPH
280° West
Cloud Level(s): Solid Overcast at 600ft
Morning Fog on Overnight Overnight... Patchy dense fog before 4am. Otherwise, mostly cloudy, with a low around 45. Calm wind.

30% chance of rain Thursday Thursday... A 30 percent chance of rain after 4pm. Patchy dense fog between 8am and 9am. Otherwise, partly sunny, with a high near 55. Calm wind becoming west southwest around 6 mph in the morning.

60% chance of rain Thursday Night Thursday Night... Rain likely, mainly after 10pm. Mostly cloudy, with a steady temperature around 51. West southwest wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

90% chance of rain Friday Friday... Rain. High near 55. South southwest wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

80% chance of rain Friday Night Friday Night... Rain, mainly before 10pm. Low around 49. West southwest wind 6 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

60% chance of rain Saturday Saturday... Rain likely, mainly after 10am. Mostly cloudy, with a high near 54. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

90% chance of rain Saturday Night Saturday Night... Rain. Low around 51. Chance of precipitation is 90%.

Rain on Sunday Sunday... Rain. Cloudy, with a high near 55.

Rain on Sunday Night Sunday Night... Rain. Cloudy, with a low around 48.

70% chance of rain Monday Monday... Rain likely. Mostly cloudy, with a high near 52.

70% chance of rain Monday Night Monday Night... Rain likely. Mostly cloudy, with a low around 46.

70% chance of rain Tuesday Tuesday... Rain likely. Mostly cloudy, with a high near 49.

Rain on Tuesday Night Tuesday Night... Rain. Mostly cloudy, with a low around 46.

70% chance of rain Wednesday Wednesday... Rain likely. Mostly cloudy, with a high near 50.

Current Radar Image


Sun Almanac for Howell Mountain, California
Sunrise: 07:23 AM
Sunset: 4:51 PM
Civil Sunrise:06:53 AM
Civil Sunset: 5:21 PM
Nautical Sunrise: 06:19 AM
Nautical Sunset: 5:54 PM
Astro Sunrise: 05:47 AM
Astro Sunset: 6:26 PM
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