textproduct: Austin/San Antonio

KEY MESSAGES

- Dry and warm during the work week into next weekend.

- Elevated heat index values expected for the I-35 corridor, Coastal and Rio Grande Plains areas through next weekend.

SHORT TERM

(Today through Tuesday) Issued at 1259 AM CDT Mon Jun 22 2026

Low clouds have begun to develop across the Coastal Plains and spreading across portions of the I-35 corridor, Hill Country, and southern Edwards Plateau. This trend continues overnight through Monday morning. Also, can't rule out a few pockets of low visibility across portions of the Hill Country and southern Edwards Plateau during the middle overnight period and sunrise. In addition to the low level clouds moving from south to north over most of the local area, there is a cluster of storms forecast to push across northeast into central Texas overnight into Monday morning. This boundary is likely sending a low level cloud deck over the Hill Country into the San Antonio area before dissipating mid Monday morning. Then a good mixing is forecast with low clouds breaking and dissipating giving way to partly cloudy to mostly sunny skies. High temperatures are forecast to reach the low to mid 90s across most of the local area and mid to upper 90s along the Rio Grande Plains and southern Edwards Plateau. With a good mixing scenario in place, heat index values are likely to range from 100 to 107 from noon to 9 PM Monday evening. Can't rule out a few spots getting to 108 and 110 for a few hours along the I-35 corridor and Coastal Plains and 110 to 113 for parts of the Rio Grande. With that said, we are holding off on a Heat Advisory. A Special Weather Statement could be issued during the daytime to address any concern about heat index values once clouds break and temperature/dewpoint combo evaluated. Otherwise, a dry and warm day is in store for Monday with a nice southerly breeze and gusts of 20 to 25 mph in the afternoon and early evening.

Low clouds return Monday evening and continue through Tuesday morning. Overnight lows stay in the 70s areawide. By Tuesday afternoon, we are expecting mostly sunny to sunny skies across South Central Texas with highs in the low to mid 90s across most areas and mid to upper 90s along the Rio Grande.

LONG TERM

(Tuesday night through Sunday) Issued at 1259 AM CDT Mon Jun 22 2026

Dry and warm weather conditions are forecast across South Central Texas through the work week into next weekend. An upper level ridge between the southwest states and northern Mexico is forecast to dominate and block disturbances from the north to reach the local area through the long term forecast period. Highs stay in the 90s and lows in the 70s.

AVIATION

(12Z TAFS) Issued at 547 AM CDT Mon Jun 22 2026

No convection is expected in the region today. Area IFR CIGs have thus far held to higher terrain in the Hill Country, so the MVFR trend continues higher each day while soils dry out. Late morning trends should be somewhat typical in terms of the mixing to VFR. More low clouds are expected to arrive near or shortly after midnight at AUS/SAT. Winds are expected to be less breezy tonight, but we'll still want to add a last minute MVFR CIG to DRT given still some decent soil and vegetation moisture to the east.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 94 78 95 77 / 0 0 0 0 Austin Bergstrom Intl Airport 93 78 95 77 / 0 0 0 0 New Braunfels Muni Airport 93 77 94 75 / 0 0 0 0 Burnet Muni Airport 93 76 93 75 / 0 0 0 0 Del Rio Intl Airport 98 78 98 77 / 0 0 0 0 Georgetown Muni Airport 93 77 95 76 / 0 0 0 0 Hondo Muni Airport 93 76 92 74 / 0 0 0 0 San Marcos Muni Airport 94 77 95 76 / 0 0 0 0 La Grange - Fayette Regional 93 79 94 77 / 0 0 0 0 San Antonio Intl Airport 93 78 93 76 / 0 0 0 0 Stinson Muni Airport 94 78 93 76 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.