Thermalito, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

855
FXUS66 KSTO 281815
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1115 AM PDT Sun Jun 28 2026


.KEY MESSAGES...

 - Elevated fire weather conditions Sunday-Monday due to increased
   North winds across portions of the Valley.

 - Chances for isolated mountain thunderstorms Monday
   afternoon/evening south of I-80.

 - Cooler temperatures and breezy onshore flow expected Tuesday
   onward.

&&

.DISCUSSION...

As an upper level trough continues its exit from California and
into the Great Basin area, north winds continue today and Monday
through the western portions of the Sacramento Valley & Delta.
This also brings fire weather conditions Sunday into Monday.
Strongest winds and most fire weather conditions peaked this
morning, but gusty conditions will linger through the afternoon
and overnight into Monday. Additionally on Monday, a lobe of
energy phasing out of the exiting trough will bring isolated
mountain thunderstorm chances (10-15%) south of I-80 in the
afternoon and evening.

Tuesday and beyond, another cooling trend is expected which will
result in below normal temperatures across interior NorCal and
periods of breezy onshore flow in the forecast. By the end of the
week, troughing will phase out of the area and temperatures will
return to more normal for the time of year. The holiday weekend
currently looks like it will see Valley highs in the 90s, with
decent overnight cooling (especially near the Delta) which will
provide relief from the warmer daytime temps.

&&

.AVIATION...

VFR conditions are expected over the next 24 hours. North winds
with gusts 15 to 25 kts in the Valley until 00Z Monday. West-
southwest gusts 15 to 20 kts in the Delta from 21Z Sunday until
09Z Monday. North winds increase in the northern Sac Valley after
06Z Monday.

&&

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

&&

$$