Duarte, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

422
FXUS66 KSTO 242030
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1230 PM PST Sat Jan 24 2026

.KEY MESSAGES...

 - Breezy north winds and clear skies through tonight.

 - Patchy morning fog in the Valley possible through Tuesday.

 - Unsettled upper level pattern brings low chances for light
   rain showers and periods of breezy onshore winds mid to late
   week.

&&

.DISCUSSION...

...This Weekend...

Dry northerly winds pushed southward through the Valley this
morning, confining any lingering fog and low clouds to the
northern San Joaquin Valley as of early this afternoon. While
winds gusting up to 35 mph will remain possible through the
afternoon, they are expected to gradually decrease into the
evening and overnight hours. As such, additional fog development
into Sunday morning will likely remain patchy, with highest
chances across the northern San Joaquin Valley.

On Sunday, a weak, embedded shortwave aloft will bring increasing
cloud cover to the region, although dry weather is expected to
continue. Resultant temperatures will be seasonably cool, with
highs in the 50s for the Delta, Valley, and foothills and highs in
the 40s at higher elevations. Modest gains in humidity recovery
are also anticipated overnight Sunday into Monday.

...The Week Ahead...

Moving into next week, a more progressive upper level pattern
looks to develop. Ridging aloft is expected to be the predominant
feature through the early week, with periodic shortwave ejections
mid to late week leading into a gradually more unsettled pattern.
At this time, the only discernible plumes of weak atmospheric
river moisture are centered further northward, resulting in some
uncertainty regarding available moisture with any shortwaves that
move through. As a result, chances for light rain showers sit
around 15-25%, with the highest potential on Wednesday across the
northern Sacramento Valley and surrounding terrain. Likewise,
attendant probabilities of rainfall greater than 0.1" around
20-40% are currently forecast for these locations.

Elsewhere, similarly seasonable temperatures are expected to
prevail. High temperatures in the upper 50s to 60s at lower
elevations and upper 40s to 50s at higher elevations are generally
anticipated, with some variations later in the week dependent on
cloud cover or lack thereof. Periodically breezy onshore winds may
be possible with any shortwave ejections, otherwise, light,
terrain driven winds look to remain the norm. Dry weather is
likely to prevail from Interstate 80 southward until available
moisture becomes more appreciable.

&&

.AVIATION...

VFR conditions expected to prevail at most sites through the
forecast period, although some MVFR/IFR in BR/FG will be possible
at SCK and MOD after 06z Sunday. Breezy north winds, gusting 20-30
kts at times, persist across the Delta, Valley, and foothills
today, gradually decreasing from 00z onward. Breezy east-
northeast winds along the Sierra to gradually decrease after 06z.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$