The combination of hot to very hot temperatures and high humidity combined to lead to heat criteria across much of the Rio Grande Valley and Deep South Texas in the later stages of June as a stubborn mid-level area of high pressure refused to let up.  For the Rio Grande Valley overall in June, emergency room hospitalizations were up 11 to 18 percent from June 2022 due to heat-related illnesses and incidents. Detailed information on heat-related illnesses (actual numbers of injuries or fatalities) was not known as of the end of August.
There was one known indirect fatality in Cameron County on June 25th, according to one of the hospital systems that serve the area.

Heat in SOUTHERN HIDALGO COUNTY, TEXAS
From 25-JUN-23 12:35:00 to 25-JUN-23 16:55:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The McAllen-Miller International Airport ASOS station (KMFE) recorded heat indices reaching or exceeding 111 degrees between 2:53PM CDT and 5:53PM CDT the afternoon of June 25th. The South Texas International Airport AWOS station (KEBG) recorded heat indices reaching or exceeding 111 degrees between 1:35PM CDT and 5:55PM CDT the afternoon of June 25th.

Heat in SOUTHERN HIDALGO COUNTY, TEXAS
From 26-JUN-23 13:35:00 to 26-JUN-23 15:35:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The McAllen-Miller International Airport ASOS station (KMFE) recorded heat indices reaching or exceeding 111 degrees at 4:53PM CDT the afternoon of June 26th. The South Texas International Airport AWOS station (KEBG) recorded heat indices reaching or exceeding 111 degrees between 2:35PM CDT and 4:35PM CDT the afternoon of June 26th.

Heat in NORTHERN HIDALGO COUNTY, TEXAS
From 23-JUN-23 11:55:00 to 23-JUN-23 16:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It is reasonable to infer that Northern Hidalgo County reached Heat criteria due to readings at the McAllen-Miller International Airport, South Texas International Airport, and Brooks County Airport, all of which reached criteria on June 23rd.

Heat in NORTHERN HIDALGO COUNTY, TEXAS
From 24-JUN-23 13:15:00 to 24-JUN-23 15:55:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It is reasonable to infer that Northern Hidalgo County reached Heat criteria due to readings at the McAllen-Miller International Airport, South Texas International Airport, and Brooks County Airport, all of which reached criteria on June 24th.

Heat in NORTHERN HIDALGO COUNTY, TEXAS
From 25-JUN-23 12:35:00 to 25-JUN-23 16:55:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It is reasonable to infer that Northern Hidalgo County reached Heat criteria due to readings at the McAllen-Miller International Airport, South Texas International Airport, and Brooks County Airport, all of which reached criteria on June 25th.

Heat in NORTHERN HIDALGO COUNTY, TEXAS
From 26-JUN-23 13:35:00 to 26-JUN-23 15:35:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It is reasonable to infer that Northern Hidalgo County reached Heat criteria due to readings at the McAllen-Miller International Airport, South Texas International Airport, and Brooks County Airport, all of which reached criteria on June 26th.

Heat in STARR, TEXAS
From 23-JUN-23 12:11:00 to 23-JUN-23 17:11:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Mesonet site at Rancho Los Comitas (extreme northern Starr County) recorded heat index values of 111 to 115 generally between 4:20 PM and 4:40 PM CDT. The RAWS site at Falcon Lake, which runs hotter than most locations but is a proxy for locations along the Rio Grande in Starr, had actual temperatures of 108 and heat index between 111 and 117 between 12:11 and 6:11 PM CDT.

Heat in STARR, TEXAS
From 24-JUN-23 11:11:00 to 24-JUN-23 17:11:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The RAWS site at Falcon Lake, which runs hotter than most locations but is a proxy for locations along the Rio Grande in Starr, had actual temperatures of 107 and heat index between 111 and 115 between 12:11 and 6:11 PM CDT.

Heat in STARR, TEXAS
From 25-JUN-23 13:11:00 to 25-JUN-23 17:11:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The RAWS site at Falcon Lake, which runs hotter than most locations but is a proxy for locations along the Rio Grande in Starr, had actual temperatures of 107 and heat index between 111 and 115 between 2:11 and 6:11 PM CDT.

Heat in STARR, TEXAS
From 26-JUN-23 13:11:00 to 26-JUN-23 17:11:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The RAWS site at Falcon Lake, which runs hotter than most locations but is a proxy for locations along the Rio Grande in Starr, had actual temperatures of 109 and heat index between 111 and 115 between 2:11 and 6:11 PM CDT.

Heat in CAMERON, TEXAS
From 23-JUN-23 10:53:00 to 23-JUN-23 15:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Harlingen-Valley International Airport ASOS reported a heat index of 111 by 2:52 PM CDT, with 111 or higher values persisting until approximately 3:52 PM CDT on June 23rd. The Brownsville-South Padre International ASOS reported a heat index of 111 by 11:53 AM CDT, with 111 or higher values persisting until approximately 4:53 PM CDT.

Heat in CAMERON, TEXAS
From 25-JUN-23 10:53:00 to 25-JUN-23 13:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Brownsville-South Padre International ASOS reported a heat index of 111 by 11:53 AM CDT, with 111 or higher values persisting until approximately 12:26 PM CDT on June 25th.  An indirect heat-related fatality was reported at 2:04 PM CDT in San Benito, Texas (less than 10 miles southwest of the Harlingen/Valley International Airport). The deceased, a 58 year old male, had several comorbidities, including diabetes mellitus, hypertension, and chronic alcohol abuse.  The cause of death was listed as Heat Exposure, indirect, by medical officials.

Heat in CAMERON, TEXAS
From 26-JUN-23 13:53:00 to 26-JUN-23 15:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Brownsville-South Padre International ASOS reported a heat index of 111 by 2:53 pM CDT, with 111 or higher values persisting until approximately 4:53 PM CDT on June 26th.

Heat in WILLACY, TEXAS
From 23-JUN-23 10:53:00 to 23-JUN-23 15:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

By proxy with nearby ASOS, AWOS, and Texas Water Development Board Mesonet sites, it is realistic to interpolate heat index values between 111 and 115 degrees across inland Willacy County during the afternoon of June 18th. Slightly lower values are common here compared with locations in Kenedy/Brooks and Cameron, due to the populated areas being in a zone of slightly lower, but still dangerous, high temperatures.

Heat in INLAND KENEDY COUNTY, TEXAS
From 25-JUN-23 13:50:00 to 25-JUN-23 16:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Water Development Board Mesonet site in Sarita (TW100) in northern Kenedy County recorded heat indices reaching or exceeding 111 degrees between 2:50PM CDT and 5:30PM CDT the afternoon of June 25th.

Heat in INLAND KENEDY COUNTY, TEXAS
From 27-JUN-23 14:10:00 to 27-JUN-23 16:10:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Water Development Board Mesonet site in Sarita (TW100) in northern Kenedy County recorded heat indices reaching or exceeding 111 degrees between 3:10PM CDT and 5:10PM CDT the afternoon of June 27th.

Heat in COASTAL WILLACY, TEXAS
From 23-JUN-23 11:53:00 to 23-JUN-23 16:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by 12:53 PM CDT, with 111 or higher values persisting until approximately 5:30 PM CDT on June 23rd. By proxy, these values likely extended northward through coastal Willacy County as well.

Heat in COASTAL KENEDY, TEXAS
From 23-JUN-23 12:30:00 to 23-JUN-23 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by 12:53 PM CDT, with 111 or higher values persisting until approximately 5:30 PM CDT on June 23rd. By proxy, these values likely extended northward through coastal Kenedy County as well.  Times were adjusted for Coastal Kenedy as a proxy to the Texas Water Development Board location in Sarita.

Heat in COASTAL WILLACY, TEXAS
From 25-JUN-23 12:30:00 to 25-JUN-23 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by approximately 1:30 PM CDT, with 111 or higher values persisting until approximately 3:30 PM CDT on June 25th.  By proxy, these values likely extended northward near the coast of Willacy County.

Heat in COASTAL KENEDY, TEXAS
From 25-JUN-23 12:30:00 to 25-JUN-23 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by approximately 1:30 PM CDT, with 111 or higher values persisting until approximately 3:30 PM CDT on June 25th.  By proxy, these values likely extended northward near the coast of Kenedy County.  In addition, the inland Texas Water Development Board Mesonet site in Sarita recorded more than three hours of heat index of 111 or higher between 150 and 410 PM CDT; times were adjusted for Coastal Kenedy as a best-guess interpolation.

Heat in COASTAL WILLACY, TEXAS
From 26-JUN-23 13:30:00 to 26-JUN-23 15:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by approximately 230 PM CDT, with 111 or higher values persisting until approximately 430 PM CDT on June 26th. Peak values were just under 113 degrees at 353 PM CDT.  By proxy, it can be assumed that these or similar values extended north near the coast (bayside) of Willacy County.

Heat in COASTAL CAMERON, TEXAS
From 23-JUN-23 11:53:00 to 23-JUN-23 16:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by 12:53 PM CDT, with 111 or higher values persisting until approximately 5:30 PM CDT on June 23rd.

Heat in COASTAL CAMERON, TEXAS
From 25-JUN-23 12:30:00 to 25-JUN-23 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by approximately 1:30 PM CDT, with 111 or higher values persisting until approximately 3:30 PM CDT on June 25th.

Heat in COASTAL WILLACY, TEXAS
From 27-JUN-23 12:30:00 to 27-JUN-23 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by approximately 1:30 PM CDT, with 111 or higher values persisting until approximately 3:30 PM CDT on June 27th. Peak heat index was 112 at 1:53 PM CDT. By proxy, these values can be extended northward along the west side of Laguna Madre in Willacy County.

Heat in COASTAL CAMERON, TEXAS
From 26-JUN-23 13:30:00 to 26-JUN-23 15:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by approximately 230 PM CDT, with 111 or higher values persisting until approximately 430 PM CDT on June 26th. Peak values were just under 113 degrees at 353 PM CDT.

Heat in COASTAL CAMERON, TEXAS
From 27-JUN-23 12:30:00 to 27-JUN-23 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by approximately 1:30 PM CDT, with 111 or higher values persisting until approximately 3:30 PM CDT on June 27th. Peak heat index was 112 at 1:53 PM CDT.

Excessive Heat in BROOKS, TEXAS
From 23-JUN-23 11:55:00 to 23-JUN-23 18:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Brooks County Airport AWOS reported a heat index of 111 by 12:55 PM CDT, with 111 or higher values persisting until approximately 7:15 PM CDT on June 23rd. A heat index of 116 degrees or higher was reported between 3:55 PM CDT and 6:35 PM CDT.

Excessive Heat in BROOKS, TEXAS
From 24-JUN-23 14:35:00 to 24-JUN-23 16:55:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Brooks County Airport AWOS reported a heat index of 111 by 3:35 PM CDT, with 111 or higher values persisting until approximately 5:55 PM CDT on June 24th. A heat index of 116 degrees or higher was reported at 4:55 PM CDT.

Excessive Heat in BROOKS, TEXAS
From 25-JUN-23 13:35:00 to 25-JUN-23 18:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Brooks County Airport AWOS reported a heat index of 111 by 2:35 PM CDT, with 111 or higher values persisting until approximately 7:15 PM CDT on June 25th. A heat index of 116 degrees or higher was reported between 4:55 PM CDT and 6:15 PM CDT.

Excessive Heat in BROOKS, TEXAS
From 27-JUN-23 15:55:00 to 27-JUN-23 18:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Brooks County Airport AWOS reported a heat index of 111 by 4:55 PM CDT, with 111 or higher values persisting until approximately 7:15 PM CDT on June 27th. A heat index of 116 degrees or higher was reported at 5:15 PM CDT.

Heat in INLAND KENEDY COUNTY, TEXAS
From 23-JUN-23 12:50:00 to 23-JUN-23 15:10:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Water Development Board Mesonet site in Sarita (TW100) in northern Kenedy County recorded heat indices reaching or exceeding 111 degrees between 1:50PM CDT and 4:10PM CDT the afternoon of June 23rd.

Heat in SOUTHERN HIDALGO COUNTY, TEXAS
From 23-JUN-23 11:55:00 to 23-JUN-23 16:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The McAllen-Miller International Airport ASOS station (KMFE) recorded heat indices reaching or exceeding 111 degrees between 1:53PM CDT and 3:53PM CDT the afternoon of June 23rd. The South Texas International Airport AWOS station (KEBG) recorded heat indices reaching or exceeding 111 degrees between 12:55PM CDT and 5:15PM CDT the afternoon of June 23rd.

Heat in SOUTHERN HIDALGO COUNTY, TEXAS
From 24-JUN-23 13:15:00 to 24-JUN-23 15:55:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The McAllen-Miller International Airport ASOS station (KMFE) recorded heat indices reaching or exceeding 111 degrees at 4:53PM CDT the afternoon of June 24th. The South Texas International Airport AWOS station (KEBG) recorded heat indices reaching or exceeding 111 degrees between 2:15PM CDT and 4:55PM CDT the afternoon of June 24th.