809
FXUS66 KSTO 291928
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1228 PM PDT Tue Sep 29 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-Monday

   - Hottest temperatures expected Saturday & Sunday, but
     Valley/Delta highs will be in the mid to upper 90s Thursday-
     Monday


&&

.DISCUSSION...

...Today-Thursday AM (9/29-10/01)...

Breezy north winds are already being observed through the northern
Sacramento Valley this afternoon. These north to east winds will
continue through the day and into Wednesday with gusts 15 to 25
mph. Downsloping winds across the mountains increase early
Wednesday morning with gusts 30 to 40 mph. Downsloping winds will
be especially gusty through gaps and canyons, including Jarbo
Gap. The strongest winds are expected today, and will then trend
weaker in the Valley Wednesday into Thursday while remaining
breezy over the mountains Thursday morning. These winds combined
with low humidities will result in Elevated Fire Weather
conditions today through Thursday morning in the Sacramento Valley
and mountains.

Temperatures will start to feel warmer today, as we gradually
warm up into midweek. Isolated areas of Moderate HeatRisk are
expected in the Valley today, with localized warmer temperatures
in Redding/northern Sacramento Valley on Wednesday.


...Thursday(rest of)-Monday (10/01-10/05)...
High temperatures will increase significantly by Thursday as
ridging builds overhead and heights increase. High temperatures
will climb 5 to 15 degrees above normal Thursday through Monday.
As a result, widespread Moderate HeatRisk is expected across the
the Valley, Delta, and Sierra foothills the Motherlode. Very
little overnight relief expected as overnight temperatures will
remain elevated with weak winds. No precipitation is expected over
the next several days at this time.

Extended guidance keeps us under broad ridging through the middle
of next week, with some slight uncertainty if mid to upper 90s
will continue past Tuesday. However, temperatures are still
favored to be above-normal as we continue through early October.


Take extra precautions against heat-related illnesses! If you`re
spending long periods of time outside this week into the weekend
and early next week, 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.
North surface wind gsts up to 25 kts in the Valley through around
03z, then surface wind gusts weaken to below 12 kts. North to east
wind gusts in higher terrain up to 30 kts next 24 hours. &&

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

$$