558
FXUS66 KSTO 091941
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1241 PM PDT Sat May 9 2026

For additional details on weather and expected impacts over the
next 7 days, please visit weather.gov/sto/briefing.

.KEY MESSAGES...

 - Increasingly hot and dry conditions through early next week,
   with widespread Moderate HeatRisk Monday and Tuesday.

 - Hottest Days Monday and Tuesday with triple digit temperatures
   and daily record highs possible.

 - Slight cooling trend from Wednesday onward, with increased Delta
   breeze influence.

&&

.DISCUSSION...

...Today through Friday...

A warming and drying trend continues today as ridging build
eastward. Widespread Minor HeatRisk is expected today and Sunday,
with areas of Moderate HeatRisk in the Valley. High temperatures
today are forecast to be in the high 80s to mid 90s. Lingering
troughing influence will somewhat temper daytime highs and provide
overnight relief through Sunday.

On Monday and Tuesday, daytime temperatures will climb again,
with widespread Moderate HeatRisk in the Valley both days. Valley
highs have potential to both meet or exceed local records, as well
as reach triple digits in some locations. The NBM has a 30 to 50%
chance of 100 degrees or more in the northern San Joaquin Valley,
as well as in the central Sacramento Valley (particularly in
eastern Glenn and Colusa Counties, and Butte County). A Heat
Advisory remains in place for these areas from 11am on Monday
through 8pm on Tuesday. Areas closer to the Delta will see much
better overnight relief on Monday and Tuesday, though daytime
temperatures will still be quite hot. Be sure to practice heat
safety! Drink plenty of fluids, stay in an air-conditioned room
or in the shade during the heat of the day, and consider checking
in on those more susceptible to heat.

Ensembles depict the ridge breaking down towards the middle of
next week which will result in a gradual cooling trend from Wednesday
onward, however temperatures will still be 5 to 15 degrees above
normal through the end of next week.

&&

.AVIATION...
General VFR conditions are expected over the next 24 hours.
Surface winds generally 12 kts or less except near the Delta,
where winds to 15 kts and gusts to 20-25 kts are possible. Local
gusts up to 20 kts across portions of the southern Sacramento and
northern San Joaquin valleys until 06z Sunday.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Heat Advisory from 11 AM Monday to 8 PM PDT Tuesday for Butte
County Below 1000 ft-C. Stanislaus County including Modesto-
Eastern Colusa County-Eastern Glenn County-W. Stanislaus County
Above 1000 ft & I-5.

&&

$$