textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 1248 PM CDT Sat Aug 29 2026

- Hot and dry weather return with temperatures in the mid to upper 90s to near 103 through the next week.

- Slight chances for seabreeze showers and storms early next week especially for the Coastal Plains.

SHORT TERM

(Tonight through Sunday night) Issued at 1248 PM CDT Sat Aug 29 2026

The dry and hot weather pattern returns and stays across the local area for the rest of today and Sunday as the upper level high pressure system over New Mexico expands and shifts to the east over the Southern Plains. Today's highs are forecast to range from the mid to upper 90s and up to 102 degrees. Highest heat index values are forecast to range from the 100 to 107 mainly for areas along and east of the I- 35 corridor, Coastal Plains, and portions of the Rio Grande and Southern Edwards Plateau. There may be a brief period (2 hours or less), where heat index values could reach 108 to 110 across the southern portions of Lavaca and DeWitt counties. Also, portions of these two counties and the row of counties above them, have a slight chance of showers and storms as the seabreeze pushes inland into these areas. The probabilities are less than 20 percent but are not zero. Latest HRRR trends show a bit less pwat and humidity values at these locations than 24 hours ago. So, will see what happen later this afternoon. At least an isolated shower or storm is possible.

For Sunday, the upper level high sits between northern Texas and Oklahoma providing a much drier day with highs in the mid to upper 90s and up to 102 degrees. With drier conditions, expect heat index values to relax a bit but still highest values in the 100 to 107 range with a few locations getting into the 108 to 110 over a few locations across the Coastal Plains.

LONG TERM

(Monday through next Saturday) Issued at 1248 PM CDT Sat Aug 29 2026

Rain chances come back to the Coastal Plains on Monday afternoon as increased moisture associated with an upper level inverted trough reaches the east Texas coast. The combination of increased moisture with the seabreeze could bring isolated to scattered showers and isolated thunderstorms. By Tuesday afternoon, the upper level high shifts to the northeast into the middle Mississippi Valley and allows the local area to receive increased moisture from the Gulf as the inverted trough pushes over South Central Texas. Medium range models and ensemble solutions are in good agreement that rain chances are limited for the next work week with the highest probability (10 to 20 percent) over the Coastal Plains. As far as high temperatures for the work week, looking for above normal values ranging from the mid to upper 90s and up to 102/103. Increased moisture middle to late week could bring near to critical heat index values for areas along and east of the I-35 corridor and Coastal Plains.

AVIATION

(18Z TAFS) Issued at 1248 PM CDT Sat Aug 29 2026

VFR conditions are forecast for the local area sites through this cycle. Southeast to south winds of 5 to 10 knots to prevail for most of the forecast period. Occasional gusts of up to 17 knots are possible during the afternoon and evening.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 76 100 76 100 / 0 0 0 0 Austin Bergstrom Intl Airport 76 99 76 99 / 0 0 0 0 New Braunfels Muni Airport 74 99 74 99 / 0 0 0 0 Burnet Muni Airport 73 97 73 97 / 0 0 0 0 Del Rio Intl Airport 77 100 77 100 / 0 0 0 0 Georgetown Muni Airport 76 99 76 99 / 0 0 0 0 Hondo Muni Airport 73 97 73 98 / 0 0 0 0 San Marcos Muni Airport 74 99 74 99 / 0 0 0 0 La Grange - Fayette Regional 76 100 76 100 / 0 0 0 0 San Antonio Intl Airport 76 98 76 98 / 10 0 0 0 Stinson Muni Airport 75 100 76 100 / 10 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.