275
FXUS66 KSGX 190914
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
214 AM PDT Wed Aug 19 2026

.SYNOPSIS...
High temperatures for inland areas of around 4 to 8 degrees above
average through Friday will cool slightly to a few to around 5
degrees above average for early next week. Greater monsoonal
moisture on Thursday and Friday and again around Monday of next
week will bring a chance of afternoon showers and thunderstorms
for the mountains and deserts. Night and morning low clouds will
continue for the coastal waters into coastal areas.

&&

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

.SHORT TERM (Today through Friday)...
For the coast and valleys, high temperatures will warm a few
degrees today and cool a few degrees on Thursday with not much
change on Friday. For the mountains and deserts, there will be
slight day to day differences through Friday.

High temperatures for today will be a few degrees above average
near the coast to 4 to 8 degrees above average for the mountains,
deserts, and inland valleys. High temperatures for today will
range from the mid 70s to lower 80s near the coast to the mid 90s
to 105 for the Inland Empire with 108 to 112 for the lower
deserts.

Precipitable water values will increase for Thursday and Friday
with a slight chance of afternoon showers and thunderstorms for
the mountains and deserts. Night and morning low clouds will
continue for the coastal waters into coastal areas.

&&

.LONG TERM (Saturday through Tuesday)...
High temperatures will be slightly cooler by early next week with
high temperatures for Monday and Tuesday a few degrees above
average for the deserts and around 5 degrees above average for the
coast and valleys. High temperatures for Monday and Tuesday will
range from the mid 70s to lower 80s near the coast to the mid 90s
to 103 for the Inland Empire with 106 to 110 for the lower
deserts.

There will be drying of monsoonal moisture for the weekend with
another brief increase possible around Monday of next week.
Chances for afternoon showers and thunderstorms for the mountains
and deserts will decrease for the weekend, then may increase again
around Monday of next week.

&&

.AVIATION...
190500Z....Coast...Patchy BKN low clouds impacting coastal TAF sites
intermittently between 09Z-16Z with bases 700-1000 ft MSL. Best
chance for cigs will again be in San Diego County. Any clouds that
develop will stay within 5-10 miles of the coastline. VIS locally
reduced to 3-5 miles in fog at times on higher coastal terrain. Low
clouds and fog clear to the beaches between 15-17Z.

Otherwise...SCT-BKN high clouds AOA 15000 feet MSL through Wednesday
afternoon.

&&

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

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory from 10 AM this morning to 8 PM PDT Thursday for
     San Bernardino and Riverside County Valleys-The Inland
     Empire.

     Extreme Heat Warning from 10 AM this morning to 8 PM PDT Friday
     for Coachella Valley-San Diego County Deserts-San Gorgonio
     Pass near Banning.

PZ...None.

&&

$$

PUBLIC...17
AVIATION/MARINE...PG

NWS San Diego (SGX) Office