Apple Valley, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

730
FXUS66 KSGX 041900
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1200 PM PDT Mon May 4 2026

.SYNOPSIS...
An area of low pressure will move over the region through
Tuesday, accompanied by continued cool and cloudier weather. Gusty
west winds in the mountains and deserts with a chance for showers
for the coastal basin will occur this evening through Tuesday
afternoon. High pressure will move into the region bringing a
warming trend with drier weather for the remainder of the week,
along with increased heat risk for inland valleys and deserts.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

An area of low pressure currently off the California coast is
bringing in high clouds from the southwest. Onshore flow continues
to push low clouds away from the coast up against the coastal
slopes with some areas within 15 miles of the coast seeing some
clearing. Winds out of the west continue to be breezy across
mountain passes into the deserts near 25-45 MPH. We can expect
these winds to increase a bit more into the afternoon and evening
across these areas. The center of the low pressure system will
move inland this evening into Tuesday, where light to moderate
showers will expand from the coastal slopes to the beaches. Hi-res
model guidance favors San Diego County to see the best chance for
light rainfall overnight into Tuesday morning, while parts of
Orange County and the Inland Empire may see nothing. Precipitation
will start sometime around sunset this evening or slightly
thereafter. Most areas will see under one tenth of an inch. Some
showers may produce rates over one quarter inch/hour in the
heaviest rain, leading to totals near one half inch possible; best
chance in the San Diego valleys and foothills.

Chilly temperatures will remain through Tuesday with this system
as highs stay in the 60s west of the mountains/high desert and
70s for the lower deserts. Tuesday and Wednesday mornings will be
cold across the mountains with temperatures in the 20s and 30s.
Big Bear will dip near 25 degrees; the daily record lows for both
Tuesday and Wednesday being 21 degrees, so not too far off!

The weather system moves out of the region Wednesday. This will be
the one day where temperatures will be near seasonal averages. High
pressure off the coast will quickly grow and expand by Thursday into
the end of the week, accompanied by much warmer weather. This will
lead to highs about 10 degrees above normal away from the coast to
start. 70s and 80s will dominate the coast and valley regions of
Orange and San Diego Counties. High temperatures will near 100
degrees on Thursday across the lower deserts with high confidence
in reaching this value by Friday. Model guidance diverges some on
the exact strength and placement of the high, so the temperature
forecast becomes hot for May standards by the weekend into early
next week, but just how hot? We`ll continue to work out these
details, but please be prepared for moderate to locally high heat
risk to impact inland valleys and across the desert regions.

&&

.AVIATION...
041800Z....Coast/Valleys...Low clouds based between 3000-6000ft MSL
will continue through the late afternoon/evening. Could see the
occasional cigs 2000-2500ft MSL in DZ or -SHRA, with chances
increasing after 04-06Z Tuesday.

.Mountains/Deserts...Strong westerly gusts up to 25-35 kts with
isolated gusts of 45 kts are expected after 19-21z. This will create
moderate to strong up/down drafts and local LLWS in the lee of
mountains. Expect reduced vis in BLDU in deserts areas. Coast-facing
mountain slopes will occasionally be obscured between 3000-6000 feet
MSL in BR where clouds intersect terrain. Chances will increase
after 02-04Z Tuesday.

&&

.MARINE...
No hazardous marine conditions are expected through Friday.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory until 9 PM PDT this evening for Apple and Lucerne
     Valleys-San Gorgonio Pass near Banning.

PZ...None.

&&

$$

PUBLIC...APR
AVIATION/MARINE...Villafane