934
FXUS66 KSGX 291846
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1146 AM PDT Wed Jul 29 2026

.SYNOPSIS...
A warming trend is expected on Thursday into the weekend as high
pressure strengthens over the area. This will lead to increased
heat risk across the region, with warmer overnight temperatures.
The hottest weather will occur on Saturday, with slight cooling
into next week. The marine layer will maintain a shallower depth,
bringing night and morning clouds near the coastal regions each
day.

&&

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

Satellite shows low clouds melting away from SoCal offshore at
this hour. Mostly clear conditions will continue through the
afternoon, before low clouds move back inland this evening. High
pressure anchored over New Mexico will strengthen and expand into
the weekend. This will keep the marine layer thinner, confining
low clouds within 10 miles from the coast each night and morning
for much of the upcoming week.

The high`s growth and transition westward will also bring a
warmer weather to the area through the weekend. The warming trend
begins on Thursday with temperatures rising another 1-3 degrees
across the area. By Friday, the high strengthens right around 600
dm, indicating a greater increase in temperatures (this time,
another 3-5 degrees warmer). The weather system peaks in intensity
on Saturday with high temperatures around 5 to 10 degrees above
normal. Widespread highs of 100 to locally near 110 can be
expected across the Inland Empire and High Desert, potentially
nearing 120 in the lower deserts. Widespread 80s and 90s will be
felt across the mountains, western valleys and beaches. Overnight
low temperatures will also be warm as more humid conditions
remain. Please practice good heat safety by limiting outdoor
recreation (mountains included!), taking water breaks, and seeking
shade when you are able to do so.

The high`s strength begins to weaken slightly by Sunday into early
next week. Sunday`s temperatures will be similar to Saturday
across mountains and deserts, cooling slightly for areas west of
the mountains as an increased sea breeze tries to cool things off
a bit. High pressure remains over the desert southwest, albeit
weaker, for the first half of next week. This will cool coastal
areas and western valleys off closer to normal. Inland
temperatures across mountains and deserts will remain elevated
nearing ten degrees above normal; chances remain high for
temperatures to stay above 110 degrees across the lower deserts at
this time. Increases in low level moisture is also seen for
inland regions by the middle of next week, so chances for rain and
storms remain small, but increase slightly.

&&

.AVIATION...
291730Z....Coast/Valleys...Low clouds will redevelop along coast
around 01-04Z, and move gradually inland into parts of the inland
valleys overnight 06-13Z. Bases 1000-1500 feet MSL with tops around
1800 feet. Areas of vis inland reduced 0-5SM. Scatter out Thursday
15-17Z.

Mountains/Deserts...Mostly SKC with unrestricted VIS through early
Thursday.

&&

.MARINE...
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...Beach Hazards Statement until 5 PM PDT this afternoon for Orange
     County Coastal Areas-San Diego County Coastal Areas.

     Coastal Flood Advisory from 5 PM this afternoon to 3 AM PDT
     Saturday for Orange County Coastal Areas-San Diego County
     Coastal Areas.

     High Surf Advisory from 5 PM this afternoon to 5 PM PDT Saturday
     for Orange County Coastal Areas-San Diego County Coastal
     Areas.

     Heat Advisory from 10 AM Friday to 8 PM PDT Sunday for Orange
     County Coastal Areas-San Diego County Coastal Areas.

     Extreme Heat Warning from 10 AM Thursday to 8 PM PDT Sunday for
     Apple and Lucerne Valleys-Coachella Valley-Riverside County
     Mountains-San Bernardino and Riverside County Valleys-The
     Inland Empire-San Diego County Deserts-San Diego County
     Mountains-San Gorgonio Pass near Banning.

     Extreme Heat Warning from 10 AM Friday to 8 PM PDT Sunday for
     Orange County Inland Areas-San Diego County Valleys-Santa
     Ana Mountains and Foothills.

     Heat Advisory from 10 AM Thursday to 8 PM PDT Sunday for San
     Bernardino County Mountains.

PZ...None.

&&

$$

PUBLIC...APR
AVIATION/MARINE...MM

NWS San Diego (SGX) Office