727
FXUS66 KSGX 081846
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1146 AM PDT Mon Jun 8 2026

.SYNOPSIS...
Warming conditions expected this week. Hottest conditions are
expected Thursday through Saturday for most locations, potentially
into Sunday for the deserts. Moderate HeatRisk is expected across
inland areas. The marine layer is expected to get shallower, staying
confined to coastal areas through much of this week.

&&

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

High temperatures today are expected to be a few degrees warmer than
yesterday for most locations. An additional 3 to 5 degrees of
warming is expected on Tuesday, which will bring conditions to a few
degrees above average for inland areas and up to 8 degrees above
average for the coast.

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
highs will increase. Warmest conditions will likely be Thursday
through Saturday, with highs 6 to 12 degrees above average. Areas of
moderate HeatRisk are expected for the Inland Empire and the
deserts, with more localized areas of moderate HeatRisk in the far
eastern San Diego county valleys. Widespread moderate with areas of
localized 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.

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, especially 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.

For much of this week the marine layer is expected to be on the
shallower side, staying confined to coastal areas.

&&

.AVIATION...
081800Z...Coast/Valleys...Low marine layer clouds have cleared out
quickly this morning, with only FEW clouds lingering along the
coastal areas into the afternoon. Low clouds to redevelop and push
back ashore after 00z Tuesday, initially across San Diego County,
eventually spreading northward into Orange County and into portions
of the western/southern Inland Empire by 12z (only a 10-20% chance
of CIGs reaching KONT between 12-16z). Cloud bases will likely be
lower than this morning (1400-1800ft MSL) but could be a bit patchy
at times. Similar scattering out time as this morning, around 16-17z
Tuesday.

Mountains/Deserts...VFR with SKC. Westerly winds return starting 21z
Mon with gusts 20-35 kts along desert slopes and locally into
deserts. Gusts exceeding 40 kts through the Banning Pass. Pockets of
MOD up/downdrafts and LLWS in lee of mtns.

&&

.MARINE...
No hazardous marine conditions are expected through Thursday
afternoon.

&&

.BEACHES...
Surf and rip current activity to remain elevated (3-6 feet) through
this evening. Surf increases Monday night into Tuesday morning as a
fresh 3-4 foot swell at 18-19 seconds moves into the region. Surf
peaks Tues-Wed with sets to 5-8 feet likely 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 from late tonight through Thursday
     afternoon for Orange County Coastal Areas-San Diego County
     Coastal Areas.

PZ...None.

&&

$$

PUBLIC...CO
AVIATION/MARINE/BEACHES...Munyan

NWS San Diego (SGX) Office