254
FXUS66 KSGX 091841
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1141 AM PDT Tue Jun 9 2026

.SYNOPSIS...
Warm conditions expected through the weekend. Moderate HeatRisk is
expected across inland areas, with localized areas of Major HeatRisk
in the low deserts over the weekend. The marine layer is expected to
get shallower, staying confined to coastal areas and portions of the
western valleys at times through much of this week.

&&

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

High pressure aloft will build over the Pacific for the middle to
end of the week. Through the forecast period the ridge axis is
expected to stay to our west, but with California in it`s periphery
warming conditions can be expected. Above average high and low
temperatures can be expected through the weekend. Areas of moderate
HeatRisk are expected for the Inland Empire and the High Desert,
with more localized areas of moderate HeatRisk in the far eastern
San Diego county valleys and Inland Orange County. Widespread
moderate with locally major HeatRisk expected in the low deserts on
Saturday. Based on current forecast, high temperatures do not look
record breaking but some low temperature records will be in
jeopardy, especially for the mountains, coast, and valleys.

The position of the ridge could allow for some subtropical moisture
to sneak into the southwestern United States by the end of the week.
Ensemble members of both the GEFS and ECMWF show a notable increase
in precipitable water into the low deserts Friday, with less but
still elevated precipitable water Saturday and Sunday. The forecast
looks to remain dry at this time so it looks like the main impact
from this moisture surge would be tempering the highs across the
deserts and an increase in high clouds. Current forecast for the low
deserts is 108-112 degrees Friday and Saturday, but if the moisture
surge materializes high temperatures would likely be lower than
that.

There is some uncertainty with highs Sunday for the desert areas.
Highs in the desert have the potential to be hotter on Sunday
compared to Friday/Saturday if the moisture surge is significantly
weaker. There is higher confidence that areas west of the mountains
will cool a degree or two by Sunday. Conditions will cool a degree
or so each day into early next week.

For much of this week the marine layer is expected to be on the
shallower side, staying confined to coastal areas and western
valleys at times. The marine layer may deepen slightly into early
next week.

&&

.AVIATION...
091800Z...Coast/Valleys...Mostly clear skies expected this afternoon
with patchy low clouds near 2000 ft MSL near VCTY KSAN at times. Low
clouds expected to fill back into coastal areas after 03Z with
coastal TAF sites impacted after 06Z Wed , slightly later in Orange
County near 08-10Z with moderate confidence on timing. Higher
confidence in cloud bases tonight slightly lower than this morning
with most cigs near 1000-1500 ft MSL, locally lower. Vis 4-6 SM in
BR over higher coastal terrain and parts of the Inland Empire.

Mountains/Deserts...VFR and SKC through Wednesday. S/W wind gusts
near 25-40 kts at times 22Z Tue-06Z Wed, highest in the San Gorgonio
Pass.

&&

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

&&

.BEACHES...
Elevated surf and rip current activity expected through Thursday
afternoon. Surf peaks on Wednesday with surf 4-7 feet and sets up to
10 feet at south-facing beaches, then gradually diminishes late this
week. See the Beach Hazards Statement for more details.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through Thursday afternoon for Orange
     County Coastal Areas-San Diego County Coastal Areas.

PZ...None.

&&

$$

PUBLIC...CO
AVIATION/MARINE/BEACHES...APR

NWS San Diego (SGX) Office