textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 532 AM CDT Tue Aug 18 2026

- Yes to the heat. No to rain chances. Pattern persists for many days. Stay safe and hydrated.

SHORT TERM

(Today through Wednesday) Issued at 1203 AM CDT Tue Aug 18 2026

Clear skies are forecast to dominate the local area at least through the early portion of the overnight period. Clouds do develop after midnight across the Coastal Plains and then move into the I-35 corridor. There is a chance for patchy to areas of fog across parts of the Coastal Plains around dawn. It should not last for more than 3 to 4 hours with fog lifting and clouds burning quickly around mid morning. Clouds dissipate and give way to sunny skies in the afternoon. The rest of the forecast story is the same like the past few days: dry and hot. Tuesday's highs are forecast to range from the upper 90s across the Hill Country and 100 to 103 elsewhere. As far as heat index values, these could be a bit higher than those observed the past few afternoons. Some locations could briefly hit the 108 to 110. In short, no heat headline is anticipated for Tuesday due to the brief period of temperatures/heat index values meeting criteria. The Texas heat is on during the short term forecast period which includes Wednesday, so stay safe and hydrated. No much changes from day to day.

LONG TERM

(Wednesday night through Monday) Issued at 1203 AM CDT Tue Aug 18 2026

The dry and hot conditions continue throughout the long term forecast period. The upper level ridging remains the main feature controlling our weather even though it shifts to the southwest/four corners region mid to late week. By the weekend into early next week, the ridging gets closer to the local area again to promote more dry and hot days ahead. There is a chance for humidity levels to increase Thursday and Friday and could bring some locations of the Coastal Plains into the Heat Advisory territory, but will see what happens then as mixing is a huge part of the decision process and forecast dewpoint values have been over forecasted.

AVIATION

(12Z TAFS) Issued at 532 AM CDT Tue Aug 18 2026

VFR conditions are expected through the period. Mostly sunny skies will persist today with south to southwest wind generally under 10 knots. Some gusts up to 20 knots may be seen this evening at KSAT/KSSF.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 103 79 102 78 / 0 0 0 0 Austin Bergstrom Intl Airport 102 79 102 78 / 0 0 0 0 New Braunfels Muni Airport 101 77 100 76 / 0 0 0 0 Burnet Muni Airport 101 76 100 75 / 0 0 0 0 Del Rio Intl Airport 101 78 102 78 / 0 0 0 0 Georgetown Muni Airport 101 78 101 78 / 0 0 0 0 Hondo Muni Airport 100 75 101 75 / 0 0 0 0 San Marcos Muni Airport 100 77 101 76 / 0 0 0 0 La Grange - Fayette Regional 100 78 101 77 / 0 0 0 0 San Antonio Intl Airport 100 78 101 78 / 0 0 0 0 Stinson Muni Airport 101 78 102 78 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.