Sebastopol Weather.

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GOES West IR satellite loop (< 30min old):

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Since July 1, we have had 9.92 " of rain. Average seasonal rainfall for January 17th is 14.5". We are now at 68% of our normal rainfall for this date.

Detailed Forecast
For West Sonoma County. Issued by NWS San Francisco Bay Area, CA

Tonight
Rain, mainly after 4am. Low around 49. West southwest wind 5 to 10 mph becoming light and variable. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Rain, mainly before 10am. High near 55. South southeast wind 11 to 14 mph becoming southwest in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Rain likely before 10pm, then a chance of showers after 10pm. Mostly cloudy, with a low around 40. West southwest wind 6 to 11 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 54. West northwest wind 6 to 10 mph. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 35. Northwest wind 5 to 10 mph.
Saturday
A 20 percent chance of showers before 10am. Mostly sunny, with a high near 54.
Saturday Night
Mostly cloudy, with a low around 40.
Sunday
Rain likely. Cloudy, with a high near 54.
Sunday Night
Rain likely. Cloudy, with a low around 44.
Monday
A chance of showers. Cloudy, with a high near 55.
Monday Night
A slight chance of showers. Mostly cloudy, with a low around 41.
Tuesday
A slight chance of showers. Partly sunny, with a high near 56.
Tuesday Night
A slight chance of rain. Mostly cloudy, with a low around 41.
Wednesday
A chance of rain. Mostly cloudy, with a high near 56.

Area Forecast Discussion

Issued by NWS San Francisco Bay Area, CA
258
FXUS66 KMTR 172230 CCA
AFDMTR

Area Forecast Discussion...Corrected
National Weather Service San Francisco Bay Area
Issued by National Weather Service LOS ANGELES/OXNARD CA
230 PM PST Wed Jan 17 2018

Corrected Marine Discussion

.SYNOPSIS...High clouds will continue to increase ahead of an
approaching cold front tonight. Light rain will start in the
North Bay Thursday morning and then spread southward through the
Bay Area and Central Coast by Thursday evening. Rain will quickly
turn to showers Thursday night into Friday as much colder air
settles over the region. Saturday morning will start out chilly
but skies should be mostly clear and dry for the start of the
weekend. The next front approaches later Sunday into Monday with
the next chance of rain.

&&

&&

.DISCUSSION...as of 01:45 PM PST Wednesday...Despite mid and high
level clouds being thinner than expected high temperatures look
to be near or slightly below forecasted values. This is likely due
to persistent marine layer influence at lower elevations with
stubborn low clouds and fog across many valley locations
especially near and north of the Bay Area. Increasing
southwesterly flow ahead of the cold front should support
deepening of the marine layer this evening. So fog, at least at
lower elevations, should be limited tonight. Showers along and
ahead of the cold front will likely develop late tonight into
early Thursday near and to the north of the Bay Area. The front
will rapidly dissipate while pushing through the remainder of the
forecast area through Thursday evening. Meanwhile post frontal
showers, more sporadic in nature will develop in the cold air mass
behind the front. The shower activity will generally diminish
through Friday evening as the core of the cold air mass and
associated instability shift into Southern California. Rainfall
amounts is expected to be generally be between one tenth and one
half inch, except locally around three quarters of an inch for
coastal slopes near Point Arena. Despite breaks in the clouds
Friday and additional sunshine for the weekend temperatures will
remain in the 50s with 40s at higher elevations. Chilly overnight
low are also expected during this time with patchy frost possible
in the coldest interior valleys. Breezy northerly winds behind the
low pressure system late Thursday through Saturday will make it
feel even cooler.

Temperatures are expected to rebound somewhat Sunday into Monday
ahead of a second low pressure system expected to move into the
region Monday. This system currently looks to be less amplified
than the one currently approaching the Pacific Northwest, which
typically results in a weaker system...especially for areas south
of the Bay Area. Model guidance continues to be in above average
agreement for the middle of next week when a third low pressure
system may also approach from the northwest, bringing an
additional chance of rain to the region.

&&

.AVIATION...(Issued by WFO Eureka)  As of 2:00 PM PST Wednesday...All Bay
Area terminals showing subtle improvement from this mornings fog and stratus
induced reduction of vsbys and cigs.  However the north Bay and SFO still
plagued by MFVR conditions with no immediate relief expected but still an
improvement from what was observed earlier this morning. Some challenging
changes expected later this evening and overnight as a weak cold front slowly
migrates across the bay area.  Have slowed the timing of rainfall from earlier
forecasts to early Thursday morning for the North Bay to late Thursday morning
for OAK and SFO.  While terminals farther south should not see any significant
rain till Thurs afternoon. Challenge is whether low stratus and fog will
redevelop tonight since mid to high cloud cover should be a mitigating factor.
Also, some pre-frontal mixing should aid in maintaining somewhat higher cigs than
what was observed last night and early this morning. Thus have hedged the next
TAF cycle in a more mvfr direction for all sites and only a slight reduction
of vsbys associated with the rainfall. Winds look to remain quite light.

Vicinity of KSFO...MVFR through 22Z with vsbys down to 4-6 miles in haze.
at times.

SFO Bridge Approach...Similar to KSFO.


&&

.MARINE...as of 2:30 PM PST Wednesday...High pressure to the
southwest will continue to shift south as a  low pressure system
approaches the Pacific Northwest. A frontal  system associated
with the low will move through the area on  Thursday. Gusty
southerly will form through tonight, then shift  quickly to
westerly on Thursday, before becoming northwesterly by  Friday. A
large long-period swell will bring dangerous breaking  waves to
the coastline tonight through at least Friday. Dense fog  with low
visibility will impact some areas today. The combination of gusty
southerly winds ahead of the cold front followed by building seas
will continue to bring Small Craft Advisory (SCA)  conditions for
the Outer Waters north of Point Reyes through at least Thursday
night night. The rest of the Outer Waters will likely  experience
SCA conditions due to building seas Thursday.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
    .Tngt...High Surf Warning...CAZ006-505-509
            High Surf Warning...CAZ529-530
            SCA...Pt Arena to Pigeon Pt 10-60 nm
            SCA...Rough Bar Advisory for SF Bar until 9 PM

&&

$$

PUBLIC FORECAST: RM
AVIATION: W Pi
MARINE: RM

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