175
FXUS66 KSGX 150735
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1235 AM PDT TUE SEP 15 2026
SYNOPSIS
GRADUAL COOLING WILL CONTINUE THROUGH WEDNESDAY FOLLOWING BY SLOW
WARMING FOR THURSDAY THROUGH SATURDAY, THEN SLOW COOLING FOR
SUNDAY AND MONDAY. NIGHT AND MORNING COASTAL LOW CLOUDS WILL
EXTEND WILL INLAND OVERNIGHT ACROSS MUCH OF THE VALLEYS INTO
WEDNESDAY MORNING, THEN DECREASE IN COVERAGE AND INLAND EXTENT
INTO THE WEEKEND.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH THURSDAY)
A LOW PRESSURE SYSTEM MOVING SOUTHWARD ALONG THE WEST COAST INTO
CALIFORNIA WILL CONTINUE THE COOLING TREND THROUGH WEDNESDAY
WITH WEDNESDAY HIGH TEMPERATURES A FEW DEGREES BELOW AVERAGE NEAR
THE COAST AND IN THE LOWER DESERTS TO 5 TO 10 DEGREES BELOW
AVERAGE FOR THE INLAND EMPIRE. HIGH TEMPERATURES ON WEDNESDAY WILL
RANGE FROM THE LOWER TO MID 70S NEAR THE COAST TO THE LOWER TO MID
80S FOR THE INLAND EMPIRE WITH THE LOWER DESERTS IN THE UPPER 90S
TO AROUND 100. LOW PRESSURE WILL BEGIN TO WEAKEN OVER CALIFORNIA ON
THURSDAY WITH WARMING OF HIGH TEMPERATURES OF A FEW DEGREES PER
DAY FOR THURSDAY THROUGH FRIDAY.
A COASTAL EDDY WITH SLOW DEEPENING OF THE MARINE LAYER WILL
CONTINUE INTO EARLY WEDNESDAY. THE MARINE LAYER WILL DEEPEN TO
2500 TO 3000 FEET WITH NIGHT AND MORNING COASTAL LOW CLOUDS
EXTENDING WELL INLAND OVERNIGHT AND ACROSS MUCH OF THE VALLEYS.
LONG TERM (FRIDAY THROUGH MONDAY)
THE WARMING TREND WILL CONTINUE THROUGH SATURDAY WITH SATURDAY
HIGH TEMPERATURES RANGING FROM A FEW DEGREES BELOW AVERAGE FOR THE
VALLEYS TO A FEW DEGREES ABOVE AVERAGE FOR THE DESERTS. HIGH
TEMPERATURES ON SATURDAY WILL RANGE FROM THE MID TO UPPER 70S NEAR
THE COAST TO THE MID 80S TO LOWER 90S FOR THE INLAND EMPIRE WITH
100 TO 104 FOR THE LOWER DESERTS.
DURING THE WEEKEND, A WEAK UPPER LEVEL LOW PRESSURE SYSTEM MAY
DEVELOP OFF THE CALIFORNIA COAST AND MOVE INTO CALIFORNIA ON
MONDAY. THIS WILL BRING A FEW DEGREES OF COOLING FOR SUNDAY AND
MONDAY WITH MONDAY HIGH TEMPERATURES RANGING FROM THE LOWER TO MID
70S NEAR THE COAST TO THE 80S FOR THE INLAND EMPIRE WITH THE LOWER
DESERTS AROUND 100. MOISTURE IS LIMITED WITH THE CHANCE OF
MEASURABLE RAINFALL IN THE MOUNTAINS ON MONDAY LESS THAN 5
PERCENT.
AVIATION
150600Z...COAST/VALLEYS...LOW CLOUDS BASED 1700-2000 FEET MSL WILL
GRADUALLY FILL MOST OF THE COASTAL BASIN OVERNIGHT. VIS REDUCED
INLAND 2-5SM. SCATTER OUT 16-18Z. LOW CLOUDS TO PUSH ASHORE AFTER
03Z TUESDAY EVE AND SPREAD INLAND OVERNIGHT AGAIN WITH BASES AROUND
1800-2200 FEET MSL.
MOUNTAINS/DESERTS...MOSTLY CLEAR AND VFR CONDITIONS THROUGH
TUESDAY.
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...NONE.
PZ...NONE.
PUBLIC...17
AVIATION/MARINE...MM
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