textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 536 AM CDT Wed Sep 23 2026

- Isolated showers and thunderstorms Wednesday and Thursday afternoons.

- Drier with summer-like temperatures through the weekend.

SHORT TERM

(Today through Thursday) Issued at 135 AM CDT Wed Sep 23 2026

Upper air analysis this evening shows a 500mb high centered over the coast near Galveston and a large amplitude ridge stretching from there to eastern WY. The flow over TX was anticyclonic and light. At the surface there is a weak frontal boundary stretched across TX cutting through our CWA from Giddings to Fredericksburg. There's not much difference between the two airmasses, but there are some northerly winds north of the front. The upper high will remain in place through the short term period. The frontal boundary will push back toward the northeast. There may be enough instability around the front to generate isolated showers and thunderstorms this afternoon and early evening over the Coastal Plains and near the northern I-35 Corridor. Any convection should dissipate quickly after sunset leading to a dry night. Thursday afternoon afternoon seabreeze showers and thunderstorms could move across the southern part of our CWA, but chances are mainly around 20%. Temperatures will be about the same as the last few days.

LONG TERM

(Thursday night through Tuesday) Issued at 135 AM CDT Wed Sep 23 2026

The upper high will remain near the TX coast through the end of the week. Strong subsidence from this feature will bring an end to the afternoon convection we've been seeing. The airmass over South- Central Texas remain about the same with low level flow from the east to southeast. Temperatures will will also be stagnant through the weekend. It will feel like an endless summer rather than the start of fall. For the start of next week, the upper high will slide to the south. The height falls associated with this movement may allow convection to develop along the northern edge of the high across our northern counties Monday and Tuesday afternoons. Chances will be better Tuesday as the high moves farther away.

AVIATION

(12Z TAFS) Issued at 536 AM CDT Wed Sep 23 2026

The only change to make note of was to introduce MVFR sooner at SAT and SSF. Otherwise, the forecast remains on track with VFR expected by 16Z at all sites. Winds will increase to 10-15 kts by late morning, relaxing once again after 06Z tonight.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 99 76 99 75 / 10 10 0 0 Austin Bergstrom Intl Airport 99 75 99 75 / 10 20 0 0 New Braunfels Muni Airport 97 74 97 73 / 10 10 0 0 Burnet Muni Airport 94 73 94 72 / 10 10 0 0 Del Rio Intl Airport 97 75 97 74 / 0 0 0 20 Georgetown Muni Airport 97 75 97 73 / 10 10 0 0 Hondo Muni Airport 95 74 95 73 / 0 10 10 10 San Marcos Muni Airport 98 74 98 73 / 10 20 0 0 La Grange - Fayette Regional 99 75 99 73 / 20 20 0 0 San Antonio Intl Airport 95 77 95 76 / 10 10 0 0 Stinson Muni Airport 97 76 96 76 / 10 10 10 10

EWX WATCHES/WARNINGS/ADVISORIES

None.