A short-duration heat wave impacted inland locations during the second weekend of September. The Coachella Valley saw readings up to 110-115 degrees on September 9, with lows only falling into the 90s. Elsewhere, the Inland Empire, the San Diego County Valleys and the High Desert saw highs in the upper-90s to low-100s each day.

Heat in APPLE AND LUCERNE VALLEYS, CALIFORNIA
From 08-SEP-23 12:00:00 to 11-SEP-23 18:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hot temperatures impacted the High Desert September 8-11, 2023. High temperatures reached the upper-80s to the upper-90s each day, with overnight lows falling into the 60s and 70s. The hottest temperatures occurred on September 9, when Apple Valley reached 99 degrees, and Hesperia reached 94 degrees.

Heat in COACHELLA VALLEY, CALIFORNIA
From 07-SEP-23 12:00:00 to 12-SEP-23 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hot temperatures impacted the Coachella Valley September 7-12, 2023. High temperatures reached the 100s to mid-110s each day, with overnight lows falling mainly into the 80s and 90s. The hottest temperatures occurred on September 9:
Palm Springs: 115/84
Indio: 112/94
Thermal Airport: 112/93.

Heat in ORANGE COUNTY INLAND, CALIFORNIA
From 09-SEP-23 10:00:00 to 09-SEP-23 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hot temperatures impacted inland Orange County on September 9, 2023. High temperatures reached the upper-80s to the upper-90s, with overnight lows falling into the upper-60s and 70s. Highs/Lows from September 9:
Yorba Linda: 98/74
Los Alamitos: 92/69
Fullerton: 96/72
Santa Ana: 94/72
Lake Forest: 94/74.

Heat in RIVERSIDE COUNTY MOUNTAINS, CALIFORNIA
From 08-SEP-23 10:00:00 to 09-SEP-23 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hot temperatures impacted the Riverside County Mountains September 8-9, 2023. High temperatures reached the upper-80s to the mid-90s each day. The hottest temperatures occurred on September 9, when Anza reached 94 degrees, and Idyllwild reached 88 degrees.

Heat in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 08-SEP-23 10:00:00 to 09-SEP-23 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hot temperatures impacted the Inland Empire September 8-9, 2023. High temperatures reached the upper-90s to the low-100s each day, with overnight lows falling into the 60s and 70s. The hottest temperatures occurred on September 8:
Ontario: 98/72
Chino: 102/69
Riverside Airport: 100/72
San Jacinto: 100/71
Temecula: 98/70
San Bernardino: 99/72.

Heat in SAN DIEGO COUNTY DESERTS, CALIFORNIA
From 07-SEP-23 10:00:00 to 12-SEP-23 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hot temperatures impacted the Coachella Valley September 7-12, 2023. High temperatures reached the 100s to mid-110s each day, with overnight lows falling mainly into the 80s and 90s. The hottest temperatures occurred on September 9, when Borrego Springs reached 110 degrees.

Heat in SAN DIEGO COUNTY VALLEYS, CALIFORNIA
From 08-SEP-23 10:00:00 to 10-SEP-23 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hot temperatures impacted the San Diego County Valleys September 8-10, 2023. High temperatures reached the upper-90s, with overnight lows falling mainly into the 60s and 70s. The hottest temperatures occurred on September 8:
Ramona: 99/61
Poway: 97/66
Alpine: 96/69
Gillespie Field: 97/70
El Cajon: 97/70.