textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 116 PM CDT Tue Aug 25 2026

- Heat Advisory continues through 7PM Wednesday for the Coastal Plains, I-35 corridor, and portions of the Hill Country.

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

SHORT TERM

(Tonight through Wednesday night) Issued at 116 PM CDT Tue Aug 25 2026

The persistent ridge that has been responsible for the dangerous heat across our area is finally starting to slide westward. As it does so we should get a little relief with temperatures "cooling" a few degrees. Instead of seeing highs near 105-107 we should see highs closer to around 100-105 for Wednesday. However, it will still be hot and a Heat Advisory remains in effect across the Coastal Plains, I-35 corridor, and portions of the Hill Country until 7pm Wednesday evening.

As far as precipitation chances, Hi-res Models were showing some signs of an outflow boundary trying to make its way southward across our area as the result of leftover convection up near the Red River Valley. The latest runs have really backed off on this scenario and now it looks like we may just get some high level clouds moving across the area which will help to limit the feel of the recent scorching heat over the area.

LONG TERM

(Thursday through next Tuesday) Issued at 116 PM CDT Tue Aug 25 2026

The upper-level ridge will continue to shift westward mid week and position itself over the Southwestern U.S, thus opening the door for a series of disturbances to track southward across the area. This will provide us with a brief stint of northwest flow aloft and the possibility for isolated to scattered showers and thunderstorms Thursday, and perhaps again on Friday. Any convection that does manage to develop will likely be high-based and would pose a gusty wind threat in any of the stronger cells.

With the cloud cover in place highs on Thursday will likely be slightly cooler and more around the 100 degree mark thus keeping us below advisory criteria. However, dewpoints are expected to increase as we remain in southeasterly flow at the surface. Additionally, any areas that receive rain/storms will likely have an uptick in humidity as well. Thursday may need to be watched if storms don't pan out as we could easily hit advisory criteria once again this time with the heat indices or feels like temperatures approaching and even exceeding 108 degrees. Friday the ridge looks to migrate ever so slowly eastward and be positioned over west TX also weakening in the process. However we arent expecting temperatures nearly as hot as this past weekend as this ridge should be weaker aloft. Additionally, we could see our typical seabreeze kick off showers and storms across the Coastal Plains due to this weaker ridge located overhead.

This weekend is when things get a bit more murky as the ridge will be continuing its progression eastward but flattening/broadening out as it does so. Models are struggling on the placement of this ridge as they typically do in weaker scenarios thus we still are expecting hot temperatures however they should be closer to around 100 degrees. Similarly the afternoon seabreeze should help to kick off isolated showers and a few rumbles of thunder across the Coastal plains as we resume our typical summer pattern. Looking ahead into early next week temperatures look to remain hot but just under heat Advisory criteria.

AVIATION

(18Z TAFS) Issued at 1234 PM CDT Tue Aug 25 2026

VFR will continue through this afternoon and evening as some mid to upper level clouds try to move in from the north. Winds remain south to southeasterly, with some stronger gusts along the I-35 corridor expected this evening. We could see some low clouds develop closer to sunrise and based on trends from today, we have added a TEMPO group for MVFR cigs at KSAT and KSSF. We will mention SCT low clouds at AUS, but will hold off on any cigs for now as confidence here is a little lower for MVFR.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 78 104 81 101 / 0 0 10 30 Austin Bergstrom Intl Airport 78 103 80 102 / 0 0 10 30 New Braunfels Muni Airport 75 103 77 101 / 0 0 10 30 Burnet Muni Airport 75 102 77 99 / 0 0 10 40 Del Rio Intl Airport 79 105 79 102 / 0 0 0 10 Georgetown Muni Airport 78 103 80 100 / 0 0 10 30 Hondo Muni Airport 75 102 77 100 / 0 0 0 30 San Marcos Muni Airport 76 103 78 101 / 0 0 10 30 La Grange - Fayette Regional 77 103 79 101 / 0 0 10 30 San Antonio Intl Airport 77 103 78 100 / 0 0 10 30 Stinson Muni Airport 77 104 78 102 / 0 0 0 20

EWX WATCHES/WARNINGS/ADVISORIES

Heat Advisory until 7 PM CDT Wednesday for TXZ171>173-191>194- 205>209-220>225.