Strong high pressure over the southwestern US led to increasing heat over Southern California in early July. High heat occurred each afternoon July 1st, 2nd, and 3rd, after which temperatures slowly cooled down.

Excessive Heat in SAN DIEGO COUNTY DESERTS, CALIFORNIA
From 01-JUL-23 11:00:00 to 03-JUL-23 20:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A heat wave impacted the San Diego County Deserts starting on July 1st and lasted through the 3rd. Highs each afternoon at Borrego Valley Airport topped out at 113 degrees on the 1st and 2nd, and hit 115 degrees on the 3rd. Excessive Heat Warnings were in effect during this time.

Excessive Heat in APPLE AND LUCERNE VALLEYS, CALIFORNIA
From 01-JUL-23 11:00:00 to 03-JUL-23 20:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A heat wave impacted the Apple and Lucerne Valleys starting on July 1st and lasting through the 3rd. Highs each afternoon at Southern California Logistics Airport (KVCV) topped out at 102, 106, and 102 degrees on the 1st, 2nd, and 3rd of July, respectively. Excessive Heat Warnings were in effect during this time.

Excessive Heat in COACHELLA VALLEY, CALIFORNIA
From 01-JUL-23 11:00:00 to 03-JUL-23 20:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A heat wave impacted the Coachella Valley starting on July 1st and lasted through the 3rd. Highs each afternoon at Palm Springs International Airport topped out at 117 degrees each afternoon on the 1st through the 3rd, while Jacqueline Cochran Regional Airport (KTRM) reported highs of 115, 111, and 115 on the 1st, 2nd, and 3rd respectively. Excessive Heat Warnings were in effect during this time.

Excessive Heat in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 01-JUL-23 11:00:00 to 03-JUL-23 20:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A heat wave impacted the San Bernardino County Mountains starting on July 1st and lasting through the 3rd. Highs at locations below 6000 FT MSL generally ranged from the upper 80s to upper 90s each day. A Heat Advisory was in effect for these days.

Excessive Heat in RIVERSIDE COUNTY MOUNTAINS, CALIFORNIA
From 01-JUL-23 11:00:00 to 03-JUL-23 20:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A heat wave impacted the Riverside County Mountains starting on July 1st and lasting through the 3rd. Highs at locations below 6000 FT MSL generally ranged from the upper 80s to upper 90s each day. A Heat Advisory was in effect for these days.

Excessive Heat in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 01-JUL-23 11:00:00 to 03-JUL-23 20:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A heat wave impacted the San Diego County Mountains starting on July 1st and lasting through the 3rd. Highs at locations below 6000 FT MSL generally ranged from the upper 80s to upper 90s each day. A Heat Advisory was in effect for these days.

Excessive Heat in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 01-JUL-23 11:00:00 to 03-JUL-23 20:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A heat wave impacted the Inland Empire starting on July 1st and lasting through the 3rd. Highs at Riverside and San Bernardino Airports ranged from 95 to 102 degrees each day. A Heat Advisory was in effect for these days.