857
FXUS66 KSGX 190125 CCA
AFDSGX
AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE SAN DIEGO CA
625 PM PDT WED MAR 18 2026
SYNOPSIS
WELL ABOVE AVERAGE CONDITIONS WILL CONTINUE THROUGH THE END OF THE
WEEK. SOME COOLING IS EXPECTED THROUGH THE WEEKEND INTO EARLY NEXT
WEEK, BUT TEMPERATURES WILL REMAIN ABOVE AVERAGE. MARINE LAYER LOW
CLOUDS AND FOG WILL BE LARGELY ABSENT FROM THE COAST THIS WEEK,
POTENTIALLY RETURNING BY LATE THIS WEEKEND.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
..NEW AVIATION DISCUSSION BELOW
TEMPERATURES AT 11 AM WERE RUNNING 5 TO 10 DEGREES COOLER THAN
YESTERDAY FOR THE COAST AND PARTS OF THE WESTERN VALLEYS. THE
MOUNTAINS AND DESERTS WERE RUNNING 5 TO 10 DEGREES WARMER THAN
YESTERDAY. A DAILY AND MONTHLY HIGH AND LOW TEMPERATURE RECORDS WERE
BROKEN YESTERDAY WITH MORE EXPECTED TO BE BROKEN EACH DAY THROUGH
FRIDAY. A CLIMATE SECTION CAN BE FOUND BELOW WITH MORE INFORMATION.
WIDESPREAD MODERATE TO LOCALLY MAJOR HEATRISK IS EXPECTED THROUGH
FRIDAY FOR MOST LOCATIONS AND SATURDAY IN THE LOW DESERT. REDUCE
OUTDOOR ACTIVITIES IF POSSIBLE BETWEEN 10 AM AND 5 PM, SEEK SHADE,
AND STAY HYDRATED.
THE HIGH PRESSURE ALOFT WILL PEAK IN STRENGTH FRIDAY WITH HIGH
TEMPERATURES 20 TO 30 DEGREES ABOVE AVERAGE FOR THIS TIME OF YEAR.
OVERNIGHT LOWS WILL ALSO BE ELEVATED, WHICH WILL LIMIT OVERNIGHT
RELIEF FROM THE HEAT FOR MOST LOCATIONS. THROUGH FRIDAY WIDESPREAD
TEMPERATURES IN THE 90S TO LOW 100S EXPECTED FOR THE INLAND VALLEYS,
WITH HIGHS IN THE MID-80S TO LOW 90S FOR COASTAL AREAS AWAY FROM THE
IMMEDIATE COAST AND THE LOWER ELEVATIONS OF THE MOUNTAINS. IN THE
LOW DESERTS, HIGHS WILL LIKELY EXCEED 105 DEGREES IN MOST LOCATIONS
THROUGH SATURDAY. CHANCES FOR EXCEEDING 110 DEGREES ON FRIDAY ARE 70
PERCENT FOR INDIO, 30 PERCENT FOR PALM SPRINGS, AND 20 PERCENT FOR
BORREGO SPRINGS. IN THE HIGH DESERT, TEMPERATURES WILL BE IN THE MID-
90S.
WEAKENING HIGH PRESSURE ALOFT AND STRENGTHENING ONSHORE FLOW WILL
BRING 4 TO 8 DEGREES OF COOLING SATURDAY. THAT WILL BE MOST
NOTICEABLE FOR LOCATIONS WEST OF THE MOUNTAINS, BUT EVEN THE DESERTS
WILL COOL 3 TO 5 DEGREES. A WEAK LOW PRESSURE SYSTEM ALOFT WILL MOVE
EAST THROUGH SOUTHERN CALIFORNIA INTO THE GREAT BASIN SOMETIME
SUNDAY OR MONDAY. THAT WILL BRING AN UPTICK IN WESTERLY WINDS
SATURDAY, WHICH HAVE THE POTENTIAL TO TURN WEAKLY OFFSHORE BY SUNDAY
OR MONDAY. WEAK RIDGING ALOFT WILL RETURN SOMETIME NEXT TUESDAY OR
WEDNESDAY, MAINTAINING ABOVE AVERAGE TEMPERATURES. LOW CLOUDS WILL
REMAIN ABSENT FROM THE COAST THROUGH THE WORK WEEK. PATCHY LOW
CLOUDS MAY RETURN WITH THE RETURN OF ONSHORE FLOW OVER THE
WEEKEND.
AVIATION
190000Z...MOSTLY CLEAR SKIES AND VFR CONDITIONS THROUGH THURSDAY
AFTERNOON. PATCHY FOG OVER COASTAL WATERS TONIGHT INTO THURSDAY, BUT
UNLIKELY TO IMPACT COASTAL AIRPORTS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH
SUNDAY.
CLIMATE
HERE ARE A LIST OF LOCATIONS CURRENTLY FORECAST TO BREAK/TIE
MONTHLY HIGH TEMPERATURE RECORDS THROUGH FRIDAY:
TODAY:
HIGH RECORD YEAR AVG +/-
RAMONA 95 89 IN 1997 68 26 MONTHLY RECORD: 94
IDYLLWILD 87 75 IN 2004 60 25 MONTHLY RECORD: 82
LAKE CUYAMACA 85 76 IN 2007 56 30 MONTHLY RECORD: 82
CAMPO 94 89 IN 2004 68 26 MONTHLY RECORD: 92
PALM SPRINGS 106 95 IN 1990 79 28 MONTHLY RECORD: 104
INDIO 105 99 IN 2007 81 26 MONTHLY RECORD: 104
THERMAL 107 97 IN 1997 82 27 MONTHLY RECORD: 103
BORREGO 104 97 IN 1972 80 24 MONTHLY RECORD: 101
THURSDAY:
FORECAST HIGH RECORD YEAR AVG +/-
RAMONA 96 92 IN 1997 68 28 MONTHLY RECORD: 94
BIG BEAR LAKE 81 70 IN 1997 52 28 MONTHLY RECORD: 80
IDYLLWILD 88 77 IN 1997 60 27 MONTHLY RECORD: 82
PALOMAR MOUNTAIN 86 76 IN 2007 57 28 MONTHLY RECORD: 82
LAKE CUYAMACA 88 79 IN 1956 56 30 MONTHLY RECORD: 82
CAMPO 97 87 IN 1997 69 26 MONTHLY RECORD: 92
PALM SPRINGS 108 97 IN 1997 80 29 MONTHLY RECORD: 104
INDIO 108 98 IN 1997 81 28 MONTHLY RECORD: 104
THERMAL 108 101 IN 1997 82 29 MONTHLY RECORD: 103
BORREGO 106 95 IN 2017 80 24 MONTHLY RECORD: 101
FRIDAY:
FORECAST HIGH RECORD YEAR AVG +/-
RAMONA 97 92 IN 1997 68 28 MONTHLY RECORD: 94
BIG BEAR LAKE 81 72 IN 2004 52 29 MONTHLY RECORD: 80
IDYLLWILD 88 79 IN 2004 60 27 MONTHLY RECORD: 82
PALOMAR MOUNTAIN 87 76 IN 1972 57 29 MONTHLY RECORD: 82
LAKE CUYAMACA 88 75 IN 2004 56 32 MONTHLY RECORD: 82
CAMPO 97 92 IN 1997 69 27 MONTHLY RECORD: 92
PALM SPRINGS 108 98 IN 2004 80 31 MONTHLY RECORD: 104
INDIO 109 100 IN 2004 81 31 MONTHLY RECORD: 104
THERMAL 111 101 IN 2004 82 32 MONTHLY RECORD: 103
BORREGO 107 97 IN 1997 80 26 MONTHLY RECORD: 101
HERE ARE A LIST OF LOCATIONS CURRENTLY FORECAST TO BREAK/TIE
MONTHLY HIGHEST LOW TEMPERATURE RECORDS WEDNESDAY THROUGH FRIDAY:
THURSDAY:
FORECAST LOW RECORD YEAR
RIVERSIDE 67 57 IN 1995 MONTHLY RECORD: 66
LAKE ELSINORE 62 56 IN 1986 MONTHLY RECORD: 61
ALPINE 69 55 IN 1990 MONTHLY RECORD: 63
IDYLLWILD 64 43 IN 2017 MONTHLY RECORD: 50
LAKE CUYAMACA 64 53 IN 2017 MONTHLY RECORD: 55
CAMPO 58 51 IN 1951 MONTHLY RECORD: 58
PALM SPRINGS 74 64 IN 2017 MONTHLY RECORD: 70
BORREGO 70 64 IN 2013 MONTHLY RECORD: 70
FRIDAY:
FORECAST LOW RECORD YEAR
RIVERSIDE 68 58 IN 1995 MONTHLY RECORD: 66
LAKE ELSINORE 64 57 IN 1940 MONTHLY RECORD: 61
ALPINE 72 58 IN 2001 MONTHLY RECORD: 63
IDYLLWILD 67 45 IN 2017 MONTHLY RECORD: 50
LAKE CUYAMACA 66 51 IN 2017 MONTHLY RECORD: 55
PALM SPRINGS 75 69 IN 1932 MONTHLY RECORD: 70
THERMAL 70 68 IN 1989 MONTHLY RECORD: 69
BORREGO 71 65 IN 2017 MONTHLY RECORD: 70
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...HEAT ADVISORY UNTIL 8 PM PDT FRIDAY FOR RIVERSIDE COUNTY
MOUNTAINS-SAN BERNARDINO COUNTY MOUNTAINS-SAN DIEGO COUNTY
MOUNTAINS.
PZ...NONE.
PUBLIC...CO
AVIATION/MARINE...STEWEY
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