805
FXUS66 KSTO 301858
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1158 AM PDT Wed Sep 30 2026

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


.KEY MESSAGES...

   - Elevated fire weather conditions today-Thursday AM due to
     periods of breezy north to east winds and low humidities.

   - High temperatures, 5-15 degrees above normal, will lead to
     Moderate HeatRisk in the Delta, Valley, and foothills
     Thursday-Tuesday

   - Hottest temperatures expected Saturday & Sunday, but
     Valley/Delta highs will be in the 90s today-Tuesday


&&

.DISCUSSION...

...Today-Thursday AM (9/30-10/01)...

Breezy north winds are expected to be weaker during the day today
compared to yesterday. There will be a period of breezier north to
east winds late tonight into early Thursday AM over the Sierra
These winds in combination with low humidities and poor overnight
recoveries, especially in the mountains will lead to Elevated
Fire Weather concerns thru Thursday AM.

Temperatures continue to warm up today with Valley and Delta high
temperatures in the 90s. Isolated areas of Moderate HeatRisk are
expected in Redding/northern Sacramento Valley today, expanding
into more of the Valley tomorrow.


...Thursday(rest of)-Tuesday (10/01-10/06)...
Riding aloft strengthens Thursday, as heights increase, leading
to unseasonably warm temperatures Thursday and continuing into
next week. High temperatures will climb 5 to 15 degrees above
normal, with the warmest days of the period expected Saturday and
Sunday. As a result, widespread Moderate HeatRisk is expected
across the the Valley, Delta, and Sierra foothills. Offshore
troughing begins to develop Sunday, moving closer onshore by
Monday which should lead to increased onshore flow through the
Delta, but model uncertainty remains on exactly how much relief
from the heat there will be.

Ridging begins to weaken slightly Monday and Tuesday, leading to a
slight "cool down" those days, however temperatures will still be
in the 90s.

Extended guidance keeps us under broad ridging through the middle
of next week, with some slight uncertainty if mid to upper 90s
will continue late next week. Temperatures are still favored to
be above-normal through the first week of October.

Take extra precautions against heat-related illnesses! If you`re
spending long periods of time outside this week into the weekend,
remember to stay hydrated, wear breathable clothing, and try to
take breaks in the shade.


&&
.AVIATION...

VFR conditions prevail across interior NorCal next 24 hours.
Valley surface winds up to 12 kts. North to east wind gusts in
higher terrain up to 20 kts next 24 hours.
&&

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

$$