Fullerton, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

673
FXUS66 KSGX 161020
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
320 AM PDT Mon Jun 16 2025

.SYNOPSIS...
There will be slow cooling through Wednesday with high
temperatures cooling from 10 to 15 degrees above average for the
deserts today to 5 to 10 degrees above average for inland areas on
Wednesday. The cooling will continue into next weekend with
weekend high temperatures around 5 degrees below average for
inland areas. There will be locally dense fog this morning near
the mesas and other higher coastal terrain. The marine layer will
slowly deepen for Wednesday into next weekend with with night and
morning coastal low clouds spreading farther into the valleys by
next weekend. Breezy west winds will continue across the mountains
and deserts each afternoon and evening, strongest today.

&&

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

.SHORT TERM (Today through Wednesday)...
Not much change in high temperatures is expected for today with
high temperatures ranging from around 5 degrees above average
near the coast to 10 to 15 degrees above average for the deserts.
High temperatures for today will range from the lower to mid 70s
near the coast to the mid 90s to 103 for the Inland Empire with
112 to 117 for the lower deserts. This will be followed by gradual
cooling spreading inland on Tuesday and Wednesday with Wednesday
high temperatures a few degrees above average near the coast to 5
to 10 degrees above average for inland areas.

The marine layer is around 1000 feet deep early this morning with
locally dense fog near the mesas and other higher coastal
terrain. The marine layer will begin to slowly deepen by Wednesday
with night and morning coastal low clouds returning to the far
western valleys.

&&

.LONG TERM (Thursday through Sunday)...
Low pressure centered near the West Coast will bring stronger
onshore flow and weaken high pressure aloft over southern
California. This will continue the cooling trend into next
weekend with high temperatures around average near the coast to a
few to around 5 degrees below average for the valleys, mountains,
and deserts. High temperatures for next weekend will range from
the lower 70s near the coast to the 80s to around 90 for the
Inland Empire with 100 to 105 for the lower deserts. The marine
layer will deepen to around 1500 to 2000 feet by next weekend with
night and morning coastal low clouds spreading farther into the
valleys.

&&

.AVIATION...
160930Z....Coast/Valleys...Low clouds have filled in about 5-10
miles inland across San Diego County this morning, and have been
spreading through coastal Orange County as well. These clouds are
currently based around 400-600ft MSL but could settle to 200-300ft
MSL by 12-14z this morning. VIS restrictions down to 0-3 SM for
coastal mesas and other areas within the cloud layer, with 1-4 SM
expected for the immediate coasts and beaches. Clouds/fog quickly
scatter out to the beaches 16-17z later this morning, with full
clearing expected by 18z. Low clouds with similar bases, VIS, and
coverage to this morning expected to develop again after 06z Tuesday.

.Mountains/Deserts...Clear skies and mostly unrestricted
VIS prevail through Monday. West winds strengthening after 18z Mon,
with wind gusts 20-30 kts, locally near 40 kts through the San
Gorgonio Pass, leading to MOD UDDFS 21z Mon-08Z Tue.

&&

.MARINE...
Wind gusts up to 20-25 kts possible in the outer waters Monday
afternoon near San Clemente Island. Otherwise, no hazardous marine
conditions are expected through Thursday.

&&

.BEACHES...
The long period southerly swell continues to wane this morning.
While 3-5 feet remains possible today across Orange County and north
San Diego County beaches, the Beach Hazard Statement was allowed to
expire.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.

&&

$$

PUBLIC...17
AVIATION/MARINE/BEACHES...Munyan