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Korbel, California 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Guerneville CA
National Weather Service Forecast for:
Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA |
| Updated: 12:27 am PST Dec 25, 2025 |
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Overnight
Severe
T-Storms
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Christmas
Day
Severe
T-Storms
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Thursday
Night
Severe
T-Storms
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Friday
Rain
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Friday
Night
Chance Rain
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Saturday
Slight Chance
Rain then
Sunny
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Saturday
Night
Mostly Clear
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Sunday
Mostly Sunny
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Sunday
Night
Mostly Clear
then Patchy
Frost
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| Lo 48 °F |
Hi 52 °F |
Lo 46 °F |
Hi 52 °F |
Lo 41 °F |
Hi 53 °F |
Lo 38 °F |
Hi 53 °F |
Lo 37 °F |
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Flood Watch
Wind Advisory
Overnight
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Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 48. South southwest wind around 14 mph, with gusts as high as 37 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
Christmas Day
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Showers and possibly a thunderstorm before 7am, then rain between 7am and 10am, then showers and possibly a thunderstorm after 10am. Some of the storms could be severe. High near 52. South southwest wind 13 to 17 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible. |
Thursday Night
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Showers and possibly a thunderstorm before 1am, then rain after 1am. Some of the storms could be severe. Low around 46. South wind 8 to 14 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible. |
Friday
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Rain, mainly before 4pm. High near 52. South wind 6 to 8 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible. |
Friday Night
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A 40 percent chance of rain, mainly before 10pm. Partly cloudy, with a low around 41. North northwest wind 3 to 5 mph. New precipitation amounts of less than a tenth of an inch possible. |
Saturday
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A 20 percent chance of rain before 10am. Mostly sunny, with a high near 53. |
Saturday Night
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Mostly clear, with a low around 38. |
Sunday
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Mostly sunny, with a high near 53. |
Sunday Night
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Patchy frost after 4am. Otherwise, mostly clear, with a low around 37. |
Monday
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Patchy frost before 8am. Otherwise, sunny, with a high near 56. |
Monday Night
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Mostly clear, with a low around 38. |
Tuesday
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Sunny, with a high near 58. |
Tuesday Night
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Mostly clear, with a low around 40. |
Wednesday
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Partly sunny, with a high near 57. |
Forecast from NOAA-NWS
for Guerneville CA.
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Weather Forecast Discussion
403
FXUS66 KMTR 251147
AFDMTR
Area Forecast Discussion
National Weather Service San Francisco CA
347 AM PST Thu Dec 25 2025
...New AVIATION, MARINE...
.KEY MESSAGES...
Updated at 1052 PM PST Wed Dec 24 2025
- Strong and damaging winds continue overnight through Thursday
evening.
- A flood watch remains in effect through Friday evening across
the region. The main threat is flash flooding and landslides
from high rain rates.
- Slight chances for severe thunderstorms begin this evening and
continue through Thursday evening. Severe threats include
damaging wind gusts and possible tornadoes.
- Dangerous beach and marine conditions continue through Friday
across the Pacific coast and adjacent beaches.
- Cold temperatures settle in this weekend after the storms break
&&
.SHORT TERM...
Issued at 1052 PM PST Wed Dec 24 2025
(Tonight through Friday)
Don`t let your guard down, the line of showers and thunderstorms
with strong winds that swept through our area earlier this
(Wednesday) evening was only a precursor to what is expected to
be the most impactful line of storms yet, that is currently about
to enter our outer marine zones about 100mi offshore. Impacts for
the next line are expected to be felt by Midnight PST, with
another round of strong wind, periods of heavy rain with the
potential of low top supercells producing waterspouts that could
move onshore as short-lived tornadoes or straight line winds up
to 80 MPH or higher. The High Wind Warning remains in place until
10 AM PST Thursday (Christmas) morning and may be extended. Our
Flood Watch remains in place until Friday night at 10 PM PST. The
SPC continues to have our entire Pacific Coast line in a Marginal
Risk for Severe Thunderstorms through early Friday morning at 4
AM. That means, the line off showers and thunderstorms progged to
move onshore as early as late afternoon Thursday into the evening
hours may be just as impactful as the one currently on our door
step. That means all hazards mentioned above are in play through
at least tomorrow night, along with the dangerous beach hazards
and gale to near storm force winds over both our coastal and outer
waters. If traveling Christmas day or night, expect extensive
travel delays, along with power outages and urban/nuisance
flooding.
&&
.LONG TERM...
Issued at 1052 PM PST Wed Dec 24 2025
(Friday night through next Wednesday)
*Long term discussion remains unchanged from Wednesday afternoon
update*
Starting in the early morning Friday, winds and shower activity
will gradually decrease as the low pressure system offshore opens
up into a trough and moves into northern Oregon. The associated
surface trough axis will move across the Bay Area Friday evening.
This will finally flip the winds back to northerly, bringing
drier, cooler weather for the weekend. The 1000-500 mb thickness
actually increases this weekend, with the cooling coming mainly from
enhanced radiation during in the cloudless nights. Sunday through
Tuesday look particularly calm, clear and cool as a 500 mb ridge
sets in. The next troughing pattern looks probable on the 1st or
2nd, just in time for King Tides. There`s no strong signal for
major impacts yet, but the CW3E ECCC AR Activity tool shows higher
than normal chances for atmospheric rivers through the first half
of January.
&&
.AVIATION...
(12Z TAFS)
Issued at 347 AM PST Thu Dec 25 2025
The main band of intense rain and wind is making its way through the
East Bay, South Bay, and the northern Monterey Bay region. It is
expected to cointinue pushing eastwards through the next couple of
hours. Behind the band, lighter rain prevails with winds remaining
rather breezy, with a chance for showers continuing through the day.
Mix of MVFR and VFR with mid-level clouds should prevail outside the
convective activity, and the winds should continue to diminish
through the TAF period.
Vicinity of SFO... Winds should continue to be rather gusty from a
generally south to southeast direction through the TAF period, with
MVFR to VFR with mid-level clouds prevailing. Gusts will top out
around 35 kt through the morning, diminishing to 20 kt in the
afternoon and evening hours. Chances for post-frontal convective
showers continue through the TAF period.
SFO Bridge Approach... Similar to SFO.
Monterey Bay Terminals... Latest high resolution model output shows
that the frontal line might not be as impactful in the Monterey Bay
region compared towards the north. If it does hold through, the
timeframe for impacts will be 13-15Z. Otherwise, generally southeast
winds will continue through the rest of the TAF period with gusts up
to 25 kt, scattered showers and generally MVFR to VFR with mid-level
ceilings.
&&
.MARINE...
(Today through Tuesday)
Issued at 347 AM PST Thu Dec 25 2025
...HAZARDOUS MARINE CONDITIONS CONTINUE INTO EARLY FRIDAY...
Southeast gales across the coastal waters continue through the
pre-dawn hours of Friday morning. These dangerous winds are
accompanied by a chance for thunderstorms and possible waterspouts
through the early morning hours. Seas will rebuild to very rough
from the choppy wind waves. These hazardous seas will linger
through Friday, reinforced by a moderate westerly swell. If your
vessel is not able to handle these conditions return to port or
seek protected waters as soon as possible.
&&
.BEACHES...
Issued at 325 PM PST Wed Dec 24 2025
A Beach Hazards Statement has been issued for the coast through
4AM Friday. The main concerns include:blowing and drifting sand
and wind waves up to 20 ft. The drifting sand and increased sea
spray will also result in poor visibilities, affecting water
rescues. Increased coastal erosion will be possible as well.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through late tonight for CAZ006-505-509-
529-530.
Flood Watch through Friday evening for CAZ006-502>506-508>510-
512>518-528>530.
High Wind Warning until 10 AM PST this morning for CAZ006-503-
505-509-517-528>530.
Wind Advisory until 10 AM PST this morning for CAZ502-504-506-
508-510-512>516-518.
PZ...Gale Warning until 3 AM PST Friday for Mry Bay-Pigeon Pt to Pt
Pinos 10-60 NM-SF Bay N of Bay Bridge.
Storm Warning until 3 AM PST Friday for Pigeon Pt to Pt Pinos 0-
10 nm-Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-
60 NM-Pt Pinos to Pt Piedras Blancas 0-10 nm-Pt Reyes to
Pigeon Pt 0-10 nm.
&&
$$
SHORT TERM...JM
LONG TERM....JM
AVIATION...DialH
MARINE...DialH
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