Grass Valley, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

762
FXUS66 KSTO 032234
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
234 PM PST Mon Nov 3 2025

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


.KEY MESSAGES...

  - Active weather returns for the middle of this week with
    showers, gusty southerly winds, isolated thunderstorms, high
    elevation snow showers and cooler temperatures
  - Heaviest precipitation is expected north of I-80
  - Unsettled weather continues late week into the weekend

.DISCUSSION...
Today...Dry and warm weather continues this afternoon with light
winds. High temperatures are forecast to be in the 70s across the
Valley, foothills and mountains of interior NorCal. A relatively
weak system will begin bring precipitation into the northern Sacramento
Valley and surrounding higher terrain starting this evening, with
chances of showers spreading into areas north of I-80 overnight.

Tuesday - Friday...A deep trough moves in Wednesday bringing
widespread rain across the region, with the best potential for
periods of moderate to heavy rain north of I-80. Models continue
to focus the greatest precipitation amounts over Shasta County,
the Northeast Foothills, the northern Sierra, the southern
Cascades, and the northern Coastal Range. Forecast rainfall
amounts continue to trend highest over the mountains of Shasta
County. Isolated thunderstorms are also possible Wednesday
afternoon and evening. This system is relatively warm so will have
higher snow levels, generally above 7500 feet. Snowfall has
trended a little lower, with the bulk of accumulation at higher
elevations, such as at Lassen National Park and the higher peaks
of the Sierra and southern Cascades, where a few inches of wet
snow are possible. Minor impacts include wet/slick roads in the
mountains Wednesday night as snow levels briefly fall to 7000
feet. Gusty southerly winds are expected over the Sacramento
Valley, the Delta, the Sierra and the southern Cascades through
the day Wednesday, with gusts of 35 mph to around 50 mph.
Lingering scattered showers mainly north of I-80 continue through
Thursday, with another weaker system focused over the northern
mountains and northern Sacramento Valley on Friday bringing
additional chances of showers. Cooler temperatures are also
expected mid to late week. As always remember to check your local
weather forecast at weather.gov for updates.

.AVIATION...
VFR conditions prevail across interior NorCal next 24 hours.
Light, variable surface winds below 12 knots. There is a slight
chance of light showers after 02z this evening mainly for areas in
northern Sacramento Valley. There is the potential for BR for the
northern San Joaquin Valleu 10-18z Tuesday morning. &&

.STO WATCHES/WARNINGS/ADVISORIES...
Wind Advisory from 10 PM Tuesday to 4 PM PST Wednesday for
Carquinez Strait and Delta-Central Sacramento Valley-Northeast
Foothills/Sacramento Valley-Northern Sacramento Valley-Southern
Sacramento Valley.

&&

$$