Atherton, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

086
FXUS66 KMTR 222352
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
352 PM PST Sun Feb 22 2026

...New AVIATION, MARINE...

.KEY MESSAGES...
Updated at 122 PM PST Sun Feb 22 2026

 - Unsettled weather with periods of rain and wind through
   Wednesday.

 - Warming and drying trend kicks off Thursday with the return of
   above normal temperatures.

&&

.SHORT TERM...
Issued at 122 PM PST Sun Feb 22 2026
(This evening through Monday)

Not much change from the prior forecast, as the first round of rain
showers traverse cross the North Bay. Rainfall amounts so far, as of
12:30pm range from 0.0-0.17" for the valleys of Sonoma County and
between 0.15-0.55" for the mountains with the higher amounts being
found across the coastal side. Showers will linger through at least
the evening hours, before lifting north into Eureka`s service area
overnight hours. Showers may skirt by the North Bay on Monday, but
the more likely scenario is that rain holds off until late Monday
evening or into the overnight hours. That means much of the region
will be left with partly to mostly cloudy skies and temperatures in
the 60s for most of the region, perhaps the low 70s for the valleys
of the South Bay and interior Central Coast.

&&

.LONG TERM...
Issued at 122 PM PST Sun Feb 22 2026
(Monday night through next Saturday)

The bulk of the rain will arrive on Tuesday, as a surface low sets
up and taps into moisture from the southwest/tropics. This will
bring periods of rain and gusty winds on Tuesday, with chances for
rain dwindling late Tuesday night into Wednesday morning. PWATs
across the region look to be between 1.2-1.4", which combined with
orographic lift may lead to some heavier bands of rain and nuisance
flooding across the North Bay or San Francisco Peninsula and into
the Santa Cruz Mountains. Valleys may be rainshadow a bit in these
regions, with rainfall amounts decreasing as you move south and into
the Central Coast. In terms of thunderstorm chances, they look to be
null as CAPE is either extremely low or zero depending on the model,
and lapse rates are stable.

As we begin to dry out on Wednesday, upper level ridging builds in
from the south and will take hold of the forecast. A warming and
drying trend begins on Thursday and continues into the weekend.
Ensembles show ridging holding, but a low developing in the Eastern
Pacific, perhaps trying skirt over or push it eastward by the
beginning of March. PoP chances are low, but still reflect that non
zero, more like 10-20% chance of rain. The CPC outlook for this
period favors the drier scenario with leaning below normal (33-50%)
chances for rain and likely above normal (60-80%) chances for above
normal temperatures.

&&

.AVIATION...
(00Z TAFS)
Issued at 352 PM PST Sun Feb 22 2026

It`s VFR with exception of low clouds /MVFR-IFR/ and light rain
across Sonoma County. Forecast is near persistence tonight with a
drying trend returning to Sonoma County Monday then rain redevelops
over the North Bay and spreads southward Monday night and Tuesday.

Vicinity of SFO...VFR. Southwest wind 12 knots becoming light
southeasterly to easterly tonight and Monday. Light southwest
wind redevelops Monday evening with vicinity showers.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR. Onshore winds 10 knots becoming
southeasterly 5 to 10 knots tonight and Monday morning. Winds
shifting to onshore 5 to 10 knots Monday afternoon.

&&

.MARINE...
(Tonight through next Friday)
Issued at 342 PM PST Sun Feb 22 2026

Southerly winds and seas diminish across the coastal waters except
across the far northwestern waters. Rain chances continue across
the northern waters then spread farther south Monday night through
Tuesday night. Winds and seas increase Tuesday then ease by
Wednesday.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 9 PM PST this evening for Pt Arena to
     Pt Reyes 0-10 nm.

     Small Craft Advisory until 3 AM PST Tuesday for Pt Arena to Pt
     Reyes 10-60 NM.

&&

$$

SHORT TERM...KR
LONG TERM....KR
AVIATION...Canepa
MARINE...Canepa

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