McArthur, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

158
FXUS66 KSTO 142051
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
151 PM PDT Thu Aug 14 2025

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

.DISCUSSION...

.SYNOPSIS...
Warmer weather on Friday, then near to below normal temperatures
through the weekend and into next week with mainly Minor
HeatRisk and periodically breezy onshore flow. Slight chance of
thunderstorms mainly over Shasta County vicinity this weekend,
otherwise dry conditions prevail.

&&

.KEY MESSAGES...

*Today-Friday:
 - Slight warming trend Today and Friday with dry conditions
 - Afternoon highs the 90s to near 100 late this week for much of
   the Valley and foothills
 - Widespread Minor HeatRisk with localized Moderate HeatRisk

*Weekend:
 - Cool down with near to below average temperatures over the
   weekend and rising relative humidity
 - Periodically breezy onshore flow is forecast at times,
   strongest in the Delta vicinity and over the Sierra Crest
 - 15-30% chance of isolated thunderstorms in Shasta County
   (includes northern Sacramento Valley), northern Coastal Range,
   and southern Cascades, dry weather elsewhere

*Early to Mid Next Week:
 - Below normal temperatures on Monday will gradually warm back up
   to near normal through next week as high pressure is favored
   to build back in over the Western US, centered over the Four
   Corners region

.Changes from previous forecast...
- Slight increase in thunderstorm potential for this weekend over
  Shasta County vicinity

&&

.AVIATION...
VFR conditions will continue for the next 24 hours across
interior NorCal. Sustained surface winds generally at or below 12
kts except in the Delta with west-southwest surface winds 12-15
kts with gusts 20-25 kts 00Z-12Z Friday. Northerly surface wind
gusts of up to 15-20 kts in the northern Sacramento Valley after
12Z Friday.

&&

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

&&

$$