Excessive Heat and Heat in Texas, June 17 to 19, 2026

Temperatures reaching to or just below 100 degrees, combined with high humidity left behind from earlier week rainfall, allowed heat index to rise to above 111 by early afternoon in Brownsville and Harlingen, peaking just below 120 (119.7) in Brownsville at 3:53 PM CDT, and at 111 at Harlingen/Valley Airport at 1:52 PM CDT. The general range was 111 to 114 degrees; the 119.7 value was just for a short while at Brownsville/South Padre Int'l Airport.

Temperatures reaching just below 100 degrees, combined with high humidity left behind from earlier week rainfall, allowed heat index to rise to or above 111 by early afternoon in coastal Cameron County, peaking at 116F at 2:53 PM CDT at the Cameron County Airport near Bayview. The general range was 111 to 114 degrees; the 119.7 value was just for a short while at Brownsville/South Padre Int'l Airport.

The combination of hot temperatures near of just above 100 degrees and high humidity, a remnant of rainfall associated with tropical moisture as Tropical Storm Arthur began to form, created heat index values estimated to be between 111 and 114, with a peak of 115, in inland Willacy County. Observed data from Valley International Airport (Harlingen, about 8 miles south of the county line) and Brooks County Airport (near Falfurrias) were used as proxy data for this area.

The combination of hot temperatures near of just above 100 degrees and high humidity, a remnant of rainfall associated with tropical moisture as Tropical Storm Arthur began to form, created heat index values estimated to be between 111 and 114, with a peak of and estimated 115, in inland Willacy County. Observed data from Cameron County Airport (Bayview, about 13 miles south of the county line) and Brooks County Airport (near Falfurrias) were used as proxy data for this area.

By proxy with the Automated Weather Observing System (AWOS) at Brooks County Airport near Falfurrias, about 10 miles west of the County line, and historical interpolation with Sarita, it was likely that heat index values reached between 111 and 114F during the early to mid afternoon. Air temperatures reached near 100 and combined with high humidity left behind from rainfall earlier in the week.

By proxy with observations in the Automated Weather Observing System (AWOS) at Brooks County Airport near Falfurrias, about 10 miles west of the County line, and historical interpolation with Sarita, as well as distant proxy from observations at Cameron County Airport, it was likely that heat index values reached 111 during the early to mid afternoon. Air temperatures reached the mid to upper 90s and combined with high humidity left behind from rainfall earlier in the week.

The combination of hot temperatures near 100 degrees and high humidity, a remnant of rainfall associated with tropical moisture as Tropical Storm Arthur began to form, created heat index values between 111 and 114 at Brooks Co. Airport near Falfurrias, with peak values briefing reaching 115 degrees.

The combination of hot temperatures near or just above 100 degrees and high humidity, a remnant of rainfall associated with tropical moisture as Tropical Storm Arthur began to form, created heat index values between 111 and 113, with a peak of 114, in southern Hidalgo County (McAllen Miller Int'l Airport).

The combination of hot temperatures near or just above 100 degrees and high humidity, a remnant of rainfall associated with tropical moisture as Tropical Storm Arthur began to form, created heat index values between 111 and 113, with a peak of 114, in northern Hidalgo County. Observed data from S. Texas International Airport (11 miles north of Edinburg) and Brooks County Airport (near Falfurrias) were used as proxy data for this area.

The hottest feels-like day in modern history occurred on June 18th across Jim Hogg County, as searing heat combined with remnant high humidity from early week's rain to produce extreme heat of 116F or higher for more than 9 hours. Peak values exceeded 120 for several hours in the mid to late afternoon, with an absolute peak of 126.08F at 2:15 PM CDT. There were no known heat-related fatalities, though data will be researched in the future. Ambient temperatures were around 100 during the time of peak heating.

The hottest feels-like day in modern history occurred on June 18th across Brooks County, as searing heat combined with remnant high humidity from early week's rain to produce extreme heat of 116F or higher for more than 9 hours. Peak values exceeded 120 for several hours in the mid to late afternoon, with an absolute peak of 124.17F at 2:55 PM CDT. There were no known heat-related fatalities, though data will be researched in the future. Ambient temperatures were around 100 during the time of peak heating.

The hottest feels-like day in modern history occurred on June 18th across Starr County, as searing heat combined with remnant high humidity from early week's rain to produce extreme heat of 116F or higher for 8-10 hours. Peak values exceeded 120 for several hours in the mid to late afternoon, with an absolute peak estimated to be around 125F, likely between 230 and 330 PM CDT. There were no known heat-related fatalities, though data will be researched in the future. Ambient temperatures were around 100 during the time of peak heating.

One of the hottest feels-like days in modern history occurred on June 18th across inland Kenedy County, as searing heat combined with remnant high humidity from early week's rain to produce extreme heat of 116F or higher for an estimated 8 to 10 hours. Peak values exceeded 120 for a few hours in the mid to late afternoon, with an absolute peak of 131.48F at 156 PM CDT at Kingsville/NAS (Kleberg, 16 miles north of the county line), with Brooks Co. Airport (about 12 miles west of the county line) over 120F at the same time. Peak heat index is assume to be around 123F in inland Kenedy. There were no known heat-related fatalities, though data will be researched in the future. Ambient temperatures were around 100 during the time of peak heating.

The Automated Surface Observing System at Cameron Co. Airport in coastal Cameron County reached a peak heat index of 114F during the afternoon, with up to 7:30 hours of values reaching advisory levels (111 to 114F in this case).

By proxy with observations in coastal Cameron County, the estimated heat index one and two counties north (Willacy and Kenedy) likely achieved similar values for about 7:30 hours from late morning through late afternoon reaching advisory levels (111 to 114F in this case).. The Automated Surface Observing System at Cameron Co. Airport in coastal Cameron County reached a peak heat index of 114F during the afternoon.

By proxy with observations in coastal Cameron County, the estimated heat index one and two counties north (Willacy and Kenedy) likely achieved similar values for about 7:30 hours from late morning through late afternoon reaching advisory levels (111 to 114F in this case). The Automated Surface Observing System at Cameron Co. Airport in coastal Cameron County reached a peak heat index of 114F during the afternoon; it is likely based on observations at Rincon del San Jose along Laguna Madre (near Kenedy Island) that similar values were achieved just west of there.

One of the hottest feels-like days in modern history occurred on June 18th across southern Hidalgo County, as searing heat combined with remnant high humidity from early week's rain to produce extreme heat of 116F or higher for 7 hours. Peak values exceeded 120 for several hours in the mid to late afternoon, with an absolute peak of 129.55F at 153 PM CDT. Mid-Valley Airport in Weslaco reached a peak of 118F at 1:35 PM CDT (This location runs a bit lower than surrounding locations). There were no known heat-related fatalities, though data will be researched in the future. Ambient temperatures were around 100 during the time of peak heating.

One of the hottest feels-like days in modern history occurred on June 18th across northern Hidalgo County, as searing heat combined with remnant high humidity from early week's rain to produce extreme heat of 116F or higher for 8 hours. Peak values exceeded 120 for several hours in the mid to late afternoon, with an absolute peak of 124.91F at 135 PM CDT. There were no known heat-related fatalities, though data will be researched in the future. Ambient temperatures were around 100 during the time of peak heating.

The hottest feels-like day in modern history occurred on June 18th across Zapata County, as searing heat combined with remnant high humidity from early week's rain to produce extreme heat of 116F or higher for 8 hours. Peak values exceeded 120 for several hours in the mid to late afternoon, with an absolute peak of 123.27F at 3:15 PM CDT. There were no known heat-related fatalities, though data will be researched in the future. Ambient temperatures were around 100 during the time of peak heating.

One of the hottest feels-like days in modern history occurred on June 18th across inland Cameron County, as searing heat combined with remnant high humidity from early week's rain to produce extreme heat of 116F or higher for 6 hours. Peak values exceeded 120 for a few hours in the mid to late afternoon, with an absolute peak of 121.15F at 153 PM CDT at Harlingen/Valley Int'l Airport and 118.37 at 12:53 PM at Brownsville/South Padre Int'l Airport. There were no known heat-related fatalities, though data will be researched in the future. Ambient temperatures were around 100 during the time of peak heating.

One of the hottest feels-like days in modern history occurred on June 18th across inland Willacy County, as searing heat combined with remnant high humidity from early week's rain to produce extreme heat of 116F or higher for 6 hours. Peak values exceeded 120 for a few hours in the mid to late afternoon, with an absolute peak of 121.15F at 153 PM CDT at Harlingen/Valley Int'l Airport and 118.37 at 12:53 PM at Brownsville/South Padre Int'l Airport. Based on proxy to Harlingen (8 miles from the county line), as well as toward Brooks County, the area was assumed to reach extreme heat levels. There were no known heat-related fatalities, though data will be researched in the future. Ambient temperatures were around 100 during the time of peak heating.

The Automated Weather Observing System at the Brooks Co. Airport recorded heat index values ranging from 111 to 115F, as the final day of a three-day mini June heat wave continued to produce dangerous, though not extreme, feels like temperatures across the area. The trifecta of dangerous heat may have caused human impacts, but data would not be available until a later date.

The third day of a trifecta of dangerous heat saw the Automated Weather Observing System (AWOS) at the South Texas Int'l. Airport record a peak heat index value 113 during the mid afternoon, with 5:30 hours of values between 111 and 113F.

The final day of a trifecta of dangerous heat afternoons saw the Automated Weather Observing System sensor at Kingsville NAS (17 miles north of the county line in Kleberg), as well as proxy observations with Brooks Co. Airport, suggested that heat index values ranged from 111 to 115 during the afternoon in Inland Kenedy County, with a few locations potentially exceeding 116 for an hour or so based on the proximity to Brooks Co. Airport.

The third day of a trifecta of dangerous heat saw the Automated Surface Observing System (ASOS) at Brownsville/South Padre Island Int'l. Airport record a peak heat index value 115.53F during the mid afternoon, while Harlingen/Valley Int'l Airport recorded a peak value of 116.02 (briefly) with 4:30 hours of values between 111 and 113F overall.

The third day of a trifecta of dangerous heat saw the Automated Surface Observing System (ASOS) at McAllen/Miller Int'l. Airport record a peak heat index value 114.65F during the mid afternoon, with four hours of values between 111 and 113F overall. Weslaco/Mid Valley Airport recorded a peak of 111F, with several observations just below this. By proxy, it is assume that much of Southern Hidalgo had values in advisory levels (111 to 115).

The third day of a trifecta of dangerous heat saw the Automated Surface Observing System (ASOS) at Cameron County Airport record a peak heat index value 112.6F during the mid afternoon. It is generally assumed that coastal Cameron County (west of Laguna Madre) observed a 3-hour period of advisory-level heat index (111 to 113 in this case).

The third day of a trifecta of dangerous heat saw the Automated Surface Observing System (ASOS) at Cameron County Airport record a peak heat index value 112.6F during the mid afternoon (12 miles south of the Willacy County line). By proxy, it is generally assumed that coastal Willacy County (west of Laguna Madre) observed a 3-hour period of advisory-level heat index (111 to 113 in this case).

The final day of a trifecta of dangerous heat afternoons saw the Automated Weather Observing System sensor at Kingsville NAS (17 miles north of the county line, inland in Kleberg), as well as proxy observations from Rincon del San Jose (along Laguna Madre) as well a downstream observations in coastal Cameron, see heat index values between 111 to 115 during the afternoon for about 3:30 hours.

The Automated Weather Observing System at the Jim Hogg Co. Airport recorded heat index values ranging from 111 to 115F, with a brief peak of 116F as the final day of a three-day mini June heat wave continued to produce dangerous, though not extreme, feels like temperatures across the area. The trifecta of dangerous heat may have caused human impacts, but data would not be available until a later date.

The Automated Weather Observing System at the Brooks Co. Airport recorded heat index values ranging from 111 to 118.18F, as the final day of a three-day mini June heat wave continued to produce dangerous, extreme feels like temperatures across the area. The period of extreme values (116F to 118F) lasted for just under three hours. It was unknown dangerous heat may have caused significant casualties, but data would not be available until a later date.

The third day of a trifecta of dangerous heat saw the Automated Weather Observing System (AWOS) at Zapata Co. Airport recorded a peak heat index value 113 during the mid afternoon, with just under three hours of values between 111 and 113F.

The Automated Weather Observing System at the Jim Hogg Co. Airport recorded heat index values ranging from 111 to 116.98F, as the final day of a three-day mini June heat wave continued to produce dangerous, extreme feels like temperatures across the area. The period of extreme values (116F) lasted for around two hours. Dangerous heat (111 to 115) stretched from 1255 until 6 PM. It was unknown dangerous heat may have caused significant casualties, but data would not be available until a later date.