Vallejo, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

740
FXUS66 KSTO 211901
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1201 PM PDT Sun Jun 21 2026


.KEY MESSAGES...

 - Warming and drying trend today into next week with minor to
   moderate HeatRisk.

 - Breezy onshore winds each day providing relief for the
   Delta/Sacramento Area

&&

.DISCUSSION...

A warming and drying trend dominates the forecast heading into
next week as ridging builds over the Pacific NW. Today should see
highs in the upper 80s to 90s before Valley highs increase to the
90s to low 100s with Min RH`s in the upper teens to 20s outside
the immediate Delta region early next week. Minor HeatRisk
continues today before transitioning to patchy Moderate HeatRisk
in the Valley early next week. Wednesday has seen conditions
trend higher with almost widespread Moderate HeatRisk outside of
the Delta/Southern Sacramento Valley.

Please continue to practice heat safety, especially those
sensitive to heat! Additionally, We will continue to monitor fire
weather conditions and watch for any changes as we continue
throughout the week. Currently, Wednesday is the driest day over
the next several days with Min RHs getting into the low teens over
the northern Sacramento Valley.

Lastly, we will see a daily Delta Breeze with gusts up to 20-30
MPH each day, strongest in the afternoons. Elsewhere, we will see
breezy winds at times in the afternoon and evenings before
becoming light at night. Please continue to monitor the forecast
and have multiple ways to receive notifications.

&&

.AVIATION...

VFR conditions are expected to continue through the TAF period.
Winds 8 to 12 kts in the Valley into 06z Monday before becoming
light and variable overnight outside of winds through the Delta
to the Sacramento sites which will gusts up to 20-25 kts until
12z Monday.


&&

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

$$