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Korbel, California 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Guerneville CA
National Weather Service Forecast for: Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:26 pm PDT Jul 8, 2025
 
Tonight

Tonight: Patchy fog after 11pm.  Otherwise, partly cloudy, with a low around 51. Calm wind.
Patchy Fog

Wednesday

Wednesday: Areas of fog before 9am.  Otherwise, sunny, with a high near 82. Calm wind becoming southwest around 6 mph in the afternoon.
Areas Fog
then Sunny
Wednesday
Night
Wednesday Night: Mostly clear, with a low around 57. Light north northwest wind.
Mostly Clear

Thursday

Thursday: Sunny, with a high near 88. Calm wind becoming west southwest around 6 mph in the afternoon.
Sunny

Thursday
Night
Thursday Night: Mostly clear, with a low around 56. West wind around 6 mph becoming calm  in the evening.
Mostly Clear

Friday

Friday: Sunny, with a high near 85.
Sunny

Friday
Night
Friday Night: Patchy fog after 4am.  Otherwise, mostly clear, with a low around 52.
Mostly Clear
then Patchy
Fog
Saturday

Saturday: Patchy fog before 7am.  Otherwise, sunny, with a high near 79.
Patchy Fog
then Sunny
Saturday
Night
Saturday Night: Patchy fog after 1am.  Otherwise, partly cloudy, with a low around 53.
Mostly Clear
then Patchy
Fog
Lo 51 °F Hi 82 °F Lo 57 °F Hi 88 °F Lo 56 °F Hi 85 °F Lo 52 °F Hi 79 °F Lo 53 °F

 

Tonight
 
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 51. Calm wind.
Wednesday
 
Areas of fog before 9am. Otherwise, sunny, with a high near 82. Calm wind becoming southwest around 6 mph in the afternoon.
Wednesday Night
 
Mostly clear, with a low around 57. Light north northwest wind.
Thursday
 
Sunny, with a high near 88. Calm wind becoming west southwest around 6 mph in the afternoon.
Thursday Night
 
Mostly clear, with a low around 56. West wind around 6 mph becoming calm in the evening.
Friday
 
Sunny, with a high near 85.
Friday Night
 
Patchy fog after 4am. Otherwise, mostly clear, with a low around 52.
Saturday
 
Patchy fog before 7am. Otherwise, sunny, with a high near 79.
Saturday Night
 
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 53.
Sunday
 
Areas of fog before 8am. Otherwise, mostly sunny, with a high near 79.
Sunday Night
 
Patchy fog. Otherwise, partly cloudy, with a low around 52.
Monday
 
Mostly sunny, with a high near 79.
Monday Night
 
Patchy fog. Otherwise, partly cloudy, with a low around 53.
Tuesday
 
Patchy fog. Otherwise, mostly sunny, with a high near 76.

 

Forecast from NOAA-NWS for Guerneville CA.

Weather Forecast Discussion
063
FXUS66 KMTR 090509
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1009 PM PDT Tue Jul 8 2025

...New AVIATION...

.KEY MESSAGES...
Updated at 1200 PM PDT Tue Jul 8 2025

 - A warming trend will bring minor to moderate HeatRisk for
   inland and higher elevations Thursday - Friday.

 - Localized elevated fire weather conditions starting Wednesday
   across the higher elevations.

&&

.UPDATE...
Issued at 900 PM PDT Tue Jul 8 2025

Overcast conditions are moving in faster than originally expected
with satellite showing stratus moving in along the coast and SF Bay
region. High temperatures were largely in the upper 70s to mid 80s
across the interior. Most sites were running at least a few degrees
below normal today. For example, San Jose only reached 77 degrees
today and Redwood City only reached 76 degrees with today`s normal
high for both cities being 81 degrees. If you`re not a fan of the
cooler than normal weather so far this month, you`re in luck as a
warming trend remains on track to begin tomorrow. Temperatures will
rise into the 80s to low 90s across the interior on Wednesday and
90s to low 100s in the warmest locations Thursday and Friday.

&&

.SHORT TERM...
Issued at 1200 PM PDT Tue Jul 8 2025
(This evening through Wednesday)

The marine layer is currently between 2,200 and 2,700 feet as weak low
pressure remains offshore. This system will gradually move inland
over the next 36 hours while weakening. Meanwhile, its previous
position offshore will be replaced by ridging from subtropical
high pressure in the Eastern Pacific. This pattern change will
cause the marine layer to compress while onshore NW winds
increase. All this means that temperatures will begin to increase
starting Wednesday. Highs are forecast to be around 5-10 degrees
warmer than today for inland areas. While becoming more shallow,
the marine layer will continue to keep coastal areas in the 60s.

&&

.LONG TERM...
Issued at 1200 PM PDT Tue Jul 8 2025
(Wednesday night through next Monday)

The warming trend will continue into Thursday as the synoptic high
pressure becomes more established offshore. For inland areas, this
will cause another 5-10 degree jump in temperatures from
Wednesday. Some interior and high elevation areas will experience
moderate HeatRisk from Thursday - Friday with afternoon
temperatures in the 90s. A very weak mid-level disturbance will
bring some relief over the weekend, but broadly speaking the
pattern looks fairly stable through at least early next week.
There will be a very broad area of high pressure across the Northeast
Pacific, with an embedded mesoscale high sitting over the Channel
Islands. While ensembles are confident that the persistent high
pressure will increase the 850 mb temperature to around 24C (90th
percentile) by Saturday, this pattern supports steady onshore
wind. With ocean temperatures cooler than normal (54F), the marine
layer should continue to keep coastal areas seasonably cool, even
while the Central Valley flirts with triple digit heat throughout
the long term forecast. There is some elevated fire weather
concerns above and inland of the marine layer`s influence. The RH
will drop below 30% at times, and afternoon wind gusts will reach up
to 30 mph. Fortunately with onshore winds, these conditions will
be diurnally driven with lighter winds and good humidity recovery
in the foothills expected each night.

&&

.AVIATION...
(06Z TAFS)
Issued at 1002 PM PDT Tue Jul 8 2025


IFR and MVFR CIGS are building along the coast and have filled at
HAF as well as the SF Bay And Monterey Bay terminals. Winds will
stay light to moderate through the night as widespread IFR CIGs
affect the region with MRY and HAF falling to LIFR into the early
morning. Inland clearing begins in the mid morning with most TAF
sites going VFR in the late morning and early afternoon. The
exception will be HAF, which keeps CIGs through the TAF period.
Winds look to stay light to moderate through the morning and
increase into late Wednesday morning and afternoon. Expect winds
to reduce into Wednesday evening with CIGs slower to move inland
that night.

Vicinity of SFO...IFR lasts into the late morning. Winds are
reducing and look to stay light through the night and much of the
morning. Expect CIGs to  erode into the late morning as moderate
to breezy west winds arrive. These winds reduce into late
Wednesday evening.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...IFR CIGs have filled over the terminals
and winds are reducing, becoming light. MRY sees winds become
very light into the night and CIGs fall to LIFR with some pockets
of mist and drizzle in the area into early Wednesday. Winds
become moderate into mid to late Wednesday morning as CIGs erode
over the terminals.

&&

.MARINE...
(Tonight through next Monday)
Issued at 900 PM PDT Tue Jul 8 2025

Expect light to moderate winds with weak seas into Wednesday.
Winds will strengthen and turn more northerly by Wednesday
afternoon and continue strengthening, becoming fresh to strong on
Thursday and into the weekend. Significant wave heights will be
rough to very rough Thursday through Saturday for the outer
waters.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory from 3 PM Wednesday to 3 AM PDT Thursday
     for Pigeon Pt to Pt Pinos 10-60 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.

&&

$$

SHORT TERM...Flynn
LONG TERM....Flynn
AVIATION...Murdock
MARINE...Murdock

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