245
FXUS66 KSGX 161752
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1052 AM PDT WED SEP 16 2026
SYNOPSIS
HIGH TEMPERATURES WILL REMAIN AS MUCH AS 5 TO 10 DEGREES BELOW
AVERAGE FOR THE MOUNTAINS AND INLAND VALLEYS THROUGH THURSDAY.
HIGH TEMPERATURES WILL WARM A FEW DEGREES EACH FOR FRIDAY AND
SATURDAY AND COOL A FEW DEGREES EACH FOR SUNDAY AND MONDAY. A
WARMING TREND WILL BEGIN ON TUESDAY WITH HIGH TEMPERATURES
RETURNING TO AROUND AVERAGE ON WEDNESDAY OF NEXT WEEK. NIGHT AND
MORNING COASTAL LOW CLOUDS WILL SPREAD INLAND ACROSS MUCH OF THE
VALLEYS FOR EARLY TODAY AND EARLY THURSDAY. THE MARINE LAYER WILL
BECOME SHALLOWER BY THE WEEKEND WITH COASTAL LOW CLOUDS NOT
SPREADING INLAND MUCH PAST THE FAR WESTERN VALLEYS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
..UPDATED AVIATION DISCUSSION
SHORT TERM (TODAY THROUGH FRIDAY)
LOW PRESSURE MOVING SOUTHWARD INTO CALIFORNIA TODAY WILL WEAKEN
AND MOVE EAST ON THURSDAY AND FRIDAY. HIGH TEMPERATURES WILL
REMAIN AS MUCH AS 5 TO 10 DEGREES BELOW AVERAGE FOR THE MOUNTAINS
AND INLAND VALLEYS FOR TODAY AND THURSDAY WITH HIGH TEMPERATURES
RANGING 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 MID TO
UPPER 90S. HIGH TEMPERATURES WILL WARM A FEW DEGREES EACH FOR
FRIDAY AND SATURDAY WITH THE SLIGHTLY GREATER WARMING FOR THE
MOUNTAINS AND INLAND VALLEYS ON SATURDAY.
THE MARINE LAYER WILL REMAIN AROUND AROUND 2500 TO 3000 FEET DEEP
INTO THURSDAY WITH NIGHT AND MORNING COASTAL LOW CLOUDS SPREADING
INTO MUCH OF THE INLAND VALLEYS LATE EACH NIGHT. THE MARINE LAYER
WILL BECOME SHALLOWER FOR FRIDAY INTO THE WEEKEND WITH NIGHT AND
MORNING COASTAL LOW CLOUDS NOT SPREADING INLAND PAST THE FAR
WESTERN VALLEYS.
LONG TERM (SATURDAY THROUGH TUESDAY)
LOW PRESSURE WILL WEAKEN ACROSS CALIFORNIA FOR FRIDAY AND SATURDAY
WITH WEAK LOW PRESSURE OFF THE CALIFORNIA COAST ON SATURDAY MOVING
INTO CENTRAL AND SOUTHERN CALIFORNIA ON SUNDAY AND MONDAY WITH
LIMITED MOISTURE. HIGH TEMPERATURES WILL WARM A FEW DEGREES FOR
FRIDAY AND SATURDAY, THEN COOL A FEW DEGREES FOR SUNDAY AND
MONDAY.
HIGH TEMPERATURES ON SATURDAY WILL BE A FEW DEGREES ABOVE AVERAGE
FOR LOWER DESERTS AND A FEW DEGREES BELOW AVERAGE FOR MOST OTHER
AREAS WITH HIGH TEMPERATURES RANGING FROM THE 70S NEAR THE COAST
TO THE MID 80S TO LOWER 90S FOR THE INLAND EMPIRE WITH 100 TO 104
FOR THE LOWER DESERTS. WITH THE COOLING, HIGH TEMPERATURES ON
MONDAY WILL RANGE FROM THE LOWER TO MID 70S NEAR THE COAST TO THE
80S FOR THE INLAND EMPIRE WITH THE LOWER DESERTS AROUND 100.
FOR THE MIDDLE AND LATTER PART OF NEXT WEEK, HIGH PRESSURE TO THE
EAST IS EXPECTED TO STRENGTHEN, BRINGING A WARMING TREND TO
SOUTHWESTERN CALIFORNIA FOR TUESDAY THROUGH FRIDAY, THOUGH WITH
INCREASING UNCERTAINTY AND MODEL SPREAD IN JUST HOW MUCH WARMING
MAY OCCUR. THE NBM 50TH PERCENTILE HIGH TEMPERATURES FOR WEDNESDAY
OF NEXT WEEK ARE WITHIN A FEW DEGREES OF AVERAGE FOR MOST
LOCATIONS.
AVIATION
161745Z...COAST/VALLEYS...SCT-BKN CLOUDS 3000-4500 FT MSL WILL
CONTINUE TO SCATTER OUT OF COASTAL/W VALLEY AREAS THROUGH ABOUT 20Z
THIS MORNING. LOW CLOUDS AROUND 2500-3000 FEET MSL WILL MOVE ASHORE
AFTER 02Z AND AGAIN FILL MOST OF THE COASTAL BASIN OVERNIGHT INTO
THURSDAY MORNING. THESE WILL AGAIN GENERALLY RISE ABOVE 3000 FT MSL
TOWARDS 16-17Z, THEN SCATTER OUT 17-20Z THU.
MOUNTAINS/DESERTS...MOSTLY CLEAR AND VFR CONDITIONS TODAY AND
TONIGHT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SUNDAY.
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...CSP
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page