Helendale, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

634
FXUS66 KSGX 092047
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
147 PM PDT Wed Jul 9 2025

.SYNOPSIS...
Heat peaks today and Thursday for inland locations. Conditions will
return to slightly below average west of the mountains for the
weekend into next week, with above average temperatures remaining in
the deserts. A shallow marine layer with patchy low clouds and fog
near the coast Thursday morning, with a more uniform marine layer
cloud deck that will reach into the western valleys returning for
the weekend into early next week.

&&

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

Visible satellite at 1 PM was showing areas of high clouds across
the area. An upper level high pressure system will continue to
expand west into Thursday, becoming more centered over Southern
California. The high pressure aloft will keep the marine layer
shallower and any additional influx in moisture will keep any marine
layer low cloud coverage patchy and confined to coastal areas
tonight into Thursday morning.

With the upper level high expanding west across Southern California
through Thursday, above average temperatures are expected for inland
locations. Highs through Thursday are expected to be 5 to 10 degrees
above average for inland locations. High temperatures will range
from the 70s near the coast; to the 90s to 105 for the Inland
Empire; and 114 to 118 for the lower deserts. In the mountains below
5000 ft, highs are expected to be in the mid-80 to upper 90s.
Widespread moderate HeatRisk is expected for the valleys and
mountains, with widespread major HeatRisk in the low deserts. Make
sure you`re staying hydrated, seeking shade, and avoiding strenuous
activity during the hottest parts of the day if possible.

High pressure aloft will remain over Southern California Friday into
early next week, but will weaken slightly and continue to move
westward over the Pacific. Highs on Friday are expected to be 4 to 8
degrees cooler than Thursday across the area. For the weekend into
the middle of next week, there will be minor day to day fluctuations
in highs temperatures. NBM high temperatures for the coast and
valleys are forecast to be up to 5 degrees below average with the
deserts around 5 degrees above average. The marine layer will deepen
Sunday through Tuesday with night and morning low clouds extending
inland to the western valleys through the middle of next week.

&&

.AVIATION...
092030Z....Coast...FEW-SCT high clouds AOA 20 kft. Low clouds based
800-1200 ft MSL return to coastal waters tonight with areas of BKN
CIGs over coastal SD County after 10z Thursday. 60-70% chance at
KSAN and 40-50% chance at KCRQ. Scattering to the coast again by 16z.

Valleys/Mountains/Deserts...VFR conditions with FEW-SCT thin high
clouds AOA 20 kft through Thu.

&&

.MARINE...
Northwest wind gusts around 20 kts near San Clemente Island along
with choppy seas this afternoon and evening, diminishing after 06z.
Otherwise, no hazardous marine weather is expected through Sunday.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory until 8 PM PDT Thursday for Riverside County
     Mountains-San Bernardino and Riverside County Valleys-The
     Inland Empire-San Diego County Mountains-San Diego County
     Valleys.

     Extreme Heat Warning until 8 PM PDT Thursday for Coachella
     Valley-San Diego County Deserts-San Gorgonio Pass near
     Banning.

PZ...None.

&&

$$

PUBLIC...CO
AVIATION/MARINE...KW