textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 712 PM CDT Sun Aug 23 2026

- Extreme Heat Warning continues Monday for the northern Hill Country and Austin area.

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

UPDATE

Issued at 712 PM CDT Sun Aug 23 2026

Due to increased confidence in similarly hot conditions continuing Monday afternoon, the Extreme Heat Warning was extended in part for Bastrop, Burnet, Llano, Travis, and Williamson counties through 7 PM CDT Monday. Temperatures up to 107F are again forecast Monday afternoon for these areas.

SHORT TERM

(Tonight through Monday night) Issued at 141 PM CDT Sun Aug 23 2026

The heat will continue to be the main focus through mid-week as temperatures remain above normal. A strong ridge of high pressure remains centered over the southern Rocky Mountains and this will be the main influencer of our weather pattern. The Extreme Heat Warning for the northern Hill Country, Austin area and southward into the Coastal plains will remain in effect until 7 PM CDT Sunday. A Heat Advisory also continues today for portions of the Hill Country, I-35 Corridor and Coastal plains. Highs are still on track to top out in the 103 to 107 degree range for areas under the Extreme Heat Warning and Heat Advisory.

For Monday (through Wednesday), we will continue the current Heat Advisory for portions of the Hill Country, I-35 Corridor, and Coastal Plains. While a few spots may approach 105 degrees (mainly northern Hill Country to near Austin), confidence is not quite high enough to go with another Extreme Heat Warning at this time.

LONG TERM

(Tuesday through next Sunday) Issued at 141 PM CDT Sun Aug 23 2026

The above mentioned ridge of high pressure will continue to remain the dominant weather feature through much of this week. There are some indications that convection to our north could send a weak outflow boundary southward late Wednesday. Confidence is low, but we will monitor as the boundary may allow a surface focus for convective initiation. In addition, models generally show a decent signal for an increase in mid and upper level cloud cover Wednesday into Thursday as the mid-level flow briefly trends back to a northwesterly direction. Weak disturbances embedded in northwest flow aloft always bear watching and for now we will keep some low rain chances (20-30%) in the forecast Thursday afternoon and evening across the Hill Country into the I-35 corridor from near San Marcos northward. Some low rain chances for the same areas could linger into Friday, but overall confidence in this is rather low.

Late in the forecast period, the flow aloft should trend back to a more north to northeasterly direction, which typically does not favor any rainfall chances. Temperatures will remain well above normal through the period and additional heat headlines will be our main concern.

AVIATION

(00Z TAFS) Issued at 640 PM CDT Sun Aug 23 2026

VFR conditions are forecast for all local terminals through Monday night. Southerly winds prevail through the period with speeds around 5 to 10 knots with occasional higher gusts during the daytime hours.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 79 106 77 105 / 0 0 0 0 Austin Bergstrom Intl Airport 77 105 77 104 / 0 0 0 0 New Braunfels Muni Airport 76 103 75 102 / 0 0 0 0 Burnet Muni Airport 76 103 74 102 / 0 0 0 0 Del Rio Intl Airport 78 105 77 103 / 0 0 0 0 Georgetown Muni Airport 78 105 77 103 / 0 0 0 0 Hondo Muni Airport 74 102 74 101 / 0 0 0 0 San Marcos Muni Airport 75 104 75 103 / 0 0 0 0 La Grange - Fayette Regional 76 104 77 104 / 0 0 0 0 San Antonio Intl Airport 76 103 76 102 / 0 0 0 0 Stinson Muni Airport 75 104 76 104 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

Extreme Heat Warning until 7 PM CDT Monday for TXZ171>173-192- 193.

Heat Advisory from 7 PM Monday to 7 PM CDT Wednesday for TXZ171>173-192-193.

Heat Advisory until 7 PM CDT Wednesday for TXZ191-194-205>209- 220>225.