textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 615 PM CDT Mon Aug 24 2026

- Extreme Heat Warning continues Monday for the northern Hill Country and Austin area along with a Heat Advisory for the Coastal Plains and I-35 corridor.

- Heat Advisory continues through Wednesday for the Coastal Plains, I-35 corridor, and portions of the Hill Country.

- Low rain chances for most areas Thursday and Friday. Otherwise, hot and dry weather throughout the week.

SHORT TERM

(Tonight through Tuesday night) Issued at 134 PM CDT Mon Aug 24 2026

Early afternoon temperature trends compared to 24 hours ago are neutral to 5 degrees lower and we have noted some subtle lowering of 850mb temperatures on the 12Z DRT sounding today vs. yesterday. However, with ample sunshine and dewpoint temperatures continuing to fall, we still expect to see plenty of warming resulting in another day of hot temperatures across the region. Based on our current forecast, we did opt to add Blanco County to the Heat Advisory for today. Otherwise, no changes were made to the Extreme Heat Warning and Heat Advisory products. For tomorrow, the overall forecast remains on track as little change in the atmospheric conditions are expected. The NBM is showing some low probabilities of temperatures reaching 105 degrees across portions of the northern Hill Country into the Austin area. However, these probabilities are low and isolated in nature. For now, we will stick with a Heat Advisory for Tuesday (and Wednesday) for the coastal plains, I-35 corridor, and portions of the Hill Country.

LONG TERM

(Wednesday through next Monday) Issued at 134 PM CDT Mon Aug 24 2026

Mid and upper level high pressure remain centered over the southwestern U.S. on Wednesday. We do expect to see the flow aloft trend to a more northwesterly direction in response to the location of the high pressure ridge. There is still some signs that convection to our north could send a weak outflow boundary southward late Wednesday. Our confidence is low as models keep any wind shift/outflow boundary to our north. We will monitor for the possibility of adding some low rain chances to portions of the southern Edwards Plateau and northern Hill Country, but will keep the forecast dry for now.

We will continue to mention low rain chances in the forecast for most of the region Thursday into Friday as northwest flow aloft sends a few weak disturbances into the region. Any convection that manages to develop will be high-based and could pose a gusty wind threat with the stronger cells. While temperatures will continue to remain above normal during the mid-week period, an increase in cloud cover and slightly lower 850mb temperatures will hopefully keep temperatures and heat index values below Heat Advisory criteria.

Towards the end of this week and into early next week, the flow aloft should trend back to a more north to northeasterly direction signaling an end to rain chances. Temperature trends from the ECMWF and GFS MOS guidance are on the uptick and if this continues, our current forecast temperatures will be a little low.

AVIATION

(00Z TAFS) Issued at 615 PM CDT Mon Aug 24 2026

VFR conditions are expected through the period. Occasional gusty wind is forecast at I-35 terminals through 06Z with southerly wind under 10 knots otherwise. Chances for any patchy MVFR ceilings at I- 35 terminals remains low and are not included in the forecast.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 77 104 79 104 / 0 0 0 0 Austin Bergstrom Intl Airport 77 104 78 103 / 0 0 0 0 New Braunfels Muni Airport 74 102 76 102 / 0 0 0 0 Burnet Muni Airport 73 102 75 101 / 0 0 0 10 Del Rio Intl Airport 77 103 79 103 / 0 0 0 0 Georgetown Muni Airport 77 104 78 103 / 0 0 0 10 Hondo Muni Airport 73 101 75 101 / 0 0 0 0 San Marcos Muni Airport 75 103 76 102 / 0 0 0 0 La Grange - Fayette Regional 77 104 78 103 / 0 0 0 0 San Antonio Intl Airport 75 102 77 102 / 0 0 0 0 Stinson Muni Airport 75 104 77 103 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

Extreme Heat Warning until 7 PM CDT this evening for TXZ171>173- 192-193.

Heat Advisory until 7 PM CDT Wednesday for TXZ171>173-192-193.

Heat Advisory until 7 PM CDT this evening for TXZ190.

Heat Advisory until 7 PM CDT Wednesday for TXZ191-194-205>209- 220>225.