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Almonte, California 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Tamalpais-homestead Valley CA
National Weather Service Forecast for: Tamalpais-homestead Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:30 pm PDT Jun 6, 2025
 
Tonight

Tonight: Mostly clear, with a low around 52. West southwest wind 7 to 9 mph.
Mostly Clear
Saturday

Saturday: Sunny, with a high near 70. West southwest wind 9 to 17 mph, with gusts as high as 21 mph.
Sunny
Saturday
Night
Saturday Night: Mostly clear, with a low around 52. West southwest wind 10 to 14 mph.
Mostly Clear
Sunday

Sunday: Mostly sunny, with a high near 68. West southwest wind 10 to 17 mph, with gusts as high as 22 mph.
Mostly Sunny
Sunday
Night
Sunday Night: Partly cloudy, with a low around 52. West southwest wind 10 to 16 mph, with gusts as high as 20 mph.
Partly Cloudy
Monday

Monday: Mostly sunny, with a high near 70.
Mostly Sunny
Monday
Night
Monday Night: Partly cloudy, with a low around 53.
Partly Cloudy
Tuesday

Tuesday: Mostly sunny, with a high near 69.
Mostly Sunny
Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 52.
Partly Cloudy
Lo 52 °F Hi 70 °F Lo 52 °F Hi 68 °F Lo 52 °F Hi 70 °F Lo 53 °F Hi 69 °F Lo 52 °F

 

Tonight
 
Mostly clear, with a low around 52. West southwest wind 7 to 9 mph.
Saturday
 
Sunny, with a high near 70. West southwest wind 9 to 17 mph, with gusts as high as 21 mph.
Saturday Night
 
Mostly clear, with a low around 52. West southwest wind 10 to 14 mph.
Sunday
 
Mostly sunny, with a high near 68. West southwest wind 10 to 17 mph, with gusts as high as 22 mph.
Sunday Night
 
Partly cloudy, with a low around 52. West southwest wind 10 to 16 mph, with gusts as high as 20 mph.
Monday
 
Mostly sunny, with a high near 70.
Monday Night
 
Partly cloudy, with a low around 53.
Tuesday
 
Mostly sunny, with a high near 69.
Tuesday Night
 
Partly cloudy, with a low around 52.
Wednesday
 
Sunny, with a high near 70.
Wednesday Night
 
Clear, with a low around 52.
Thursday
 
Sunny, with a high near 72.
Thursday Night
 
Clear, with a low around 51.
Friday
 
Sunny, with a high near 70.

 

Forecast from NOAA-NWS for Tamalpais-homestead Valley CA.

Weather Forecast Discussion
227
FXUS66 KMTR 070359
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
859 PM PDT Fri Jun 6 2025

...New UPDATE, MARINE...

.SYNOPSIS...
Issued at 103 PM PDT Fri Jun 6 2025

Mostly quiet conditions prevail through the forecast period with
warm temperatures inland and cool, seasonable temps along the
coast. Slight cooling trend by the middle of next week as a deeper
trough pattern develops off the West Coast.

&&

.UPDATE...
Issued at 858 PM PDT Fri Jun 6 2025

Not a bad way to finish the workweek weather wise, seasonably mild
conditions around the Bay Area and Central Coast.  Sunny skies
blanketed the inland areas with highs reaching the 70s to mid 90s.
Quite a different story by the ocean as low clouds hugged the coast
keeping temps chilly and in the upper 50s to 60s.  It`s June so this
shouldn`t be that much of a surprise.  Daytime heating combined with
a little bit of upper level moisture led to a few fair weather cu
popping over the Gabilan Range this afternoon, but they have since
faded now that the sun is setting.  We even had a little Sierra
tstorm blow off drift westward over portions of the Bay Area as
well.  One other weather item of note were the winds.  Persistent
onshore flow led to stronger onshore winds this afternoon with the
strongest winds over the inland valleys, interior gaps, and passes.
Max observed gusts were 25-35 mph with an isolated gust to 40 mph.

For tonight - more of the same. The marine layer that stayed over
the coastal waters this afternoon will move inland again. Saturday
will start out cloud for a good chunk of the inland valleys.

No forecast update needed...

MM

&&

.SHORT TERM...
(This evening through Saturday)
Issued at 103 PM PDT Fri Jun 6 2025

Stratus quo, deja vu, groundhog day, whatever you want to call
it. Inland areas heating up to comfortable and seasonable
temperatures today while the coastline is once again leaving folks
in a paralyzing state of "should I bring a jacket". Then they
don`t because it feels nice at first and end up regretting it 30
minutes later. This trend generally continues into the weekend
with inland locations heating up by a few more degrees while
coastal locations remain in this cool but nice state with near
normal temperatures. A few coastal locations will see temps a bit
more tolerable for short sleeves and shorts such as Santa Cruz,
Big Sur, and Monterey (for like a couple of hours). Are
convertible pants still a thing? I digress.

&&

.LONG TERM...
(Saturday night through next Thursday)
Issued at 103 PM PDT Fri Jun 6 2025

Really not much change into the end of the weekend with the upper
level ridge mostly staying put, and nothing to drive the weak
closed low away. Therefore, the pattern is slow to revert. By the
middle of the week, guidance depicts a deeper open wave trough
that would kick off a cooling trend into late next week. Ensemble
guidance has been greatly confident in advertising this whole
pattern evolution over the next several days. All-in-all, most
people aren`t going to notice much day-to-day difference before
the middle of next week with the exception of the inland areas
recognizing that their car thermometer says 82 instead of 80.

&&

.AVIATION...
(00Z TAFS)
Issued at 638 PM PDT Fri Jun 6 2025

It`s VFR except for stratus /MVFR possibly IFR/ along the immediate
coastline per surface observations and satellite imagery. A weak
low pressure area straddles the CA coastal waters and offshore waters.
The latest NAM and HRRR output are having trouble resolving the
strength of the southerly SMX-SFO, SNS-SJC and STS-UKI pressure
gradients and winds associated with the somewhat distant low.
Southerly winds are resulting in a combination of the usual
southerly downsloping and drying influences into the marine layer
while also drawing in late afternoon drier air continental
influence in return flow typical of afternoon thermally direct
seabreeze circulations.

In this current pattern KHAF stands with a high probability of
ongoing MVFR which may become IFR later this evening to early
Saturday since the late afternoon Oakland upper air sounding
showed a lowered temperature inversion based at 1100 feet (vs 2000
feet base early this morning on the 12z sounding). KSTS and KOAK
with southerly wind and northwesterly wind respectively will
likely see a stratus intrusion during the mid evening. KSNS will
likely see stratus before KMRY due to wind flow across the
Monterey Peninsula and the Monterey Bay that resembles a southerly
wind reversal. Post sunset pressure gradients will ease in
response to nocturnal cooling and subsequently a decrease in land
vs sea surface temps, leaving the onshore SFO-SAC pressure
gradient/wind to usher in stratus and/or fog tonight and Saturday
morning. The marine layer depth varies from several hundred feet
to 1700 feet.

The aforementioned low pressure area will slowly drift southwest
tonight and Saturday, which should allow a surface ridge of high
pressure to build in over the coastal waters mainly resulting in
strengthening SFO-SAC pressure gradient/wind this time tomorrow;
just don`t know with certainty, will have to closely monitor.

Vicinity of SFO...Currently 300-310 wind direction, marine layer
depth approx 1100 feet vicinity KSFO and momentum of southerly
winds along the ocean side of the SF Peninsula will help keep VFR
going through early evening. Uncertain on timing of stratus
intrusion, for now tempo group is 04z-08z this evening for MVFR
then transitioning to IFR based on RAP/HREF output. RAP model is
pessimistic with low ceiling tonight and Saturday morning at
KSFO. Current forecast indicates VFR returning by late morning
Saturday (RAP model is near 100% humidity near surface thru 17z
Saturday). West to northwest wind gusting to 25 knots through 04z
this evening, near 10 knots overnight and Saturday morning, west
to northwest wind increasing to 25 knots Saturday afternoon and
early evening.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Currently the surface pressure gradient,
wind and visible satellite pattern resembles a southerly wind
reversal from the Monterey Bay area to the northern Salinas
Valley. It`s a challenging coastal stratus/fog pattern for
aviation from the Bay Area to the north Central Coast since the
model forecasts are not really seeing the pattern. With onset of
nocturnal cooling the gradient field will ease with the onshore
winds likely predominating later in the evening. In the meantime,
the area terminals will have ongoing VFR until later in the
evening, then increasing probability of IFR developing, with IFR
prevailing tonight and Saturday morning. Stratus and any lingering
patchy fog will mix out late Saturday morning. Winds becoming
mainly onshore during the evening and overnight 5 to 10 knots.
Onshore winds Saturday afternoon and early evening 10 to 15 knots.

&&

.MARINE...
(Tonight through next Thursday)
Issued at 858 PM PDT Fri Jun 6 2025

A weak low pressure area will drift to the southwest over the
offshore waters tonight and Saturday. Breezes will become more
westerly on Saturday. Diurnal effects will bring a fresh to strong
SW breeze to the San Francisco Bay over the next couple
afternoons. A long period southwesterly swell arrives early next
week. Winds  and seas will rebuild more substantially mid to late
next week.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 9 PM PDT this evening for SF Bay N of
     Bay Bridge.

     Small Craft Advisory from 3 PM to 9 PM PDT Saturday for SF Bay N
     of Bay Bridge.

&&

$$

UPDATE...MM
SHORT TERM...Behringer
LONG TERM....Behringer
AVIATION...Canepa
MARINE...Canepa

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