textproduct: Austin/San Antonio

SHORT TERM

(Today through Monday) Issued at 1245 AM CDT Sun Sep 13 2026

The ridge currently impacting our area will move over North Texas today thus keeping rain chances low once again. The main exception would be for the coastal plains. Highs should be a degree or two today but could still support Heat Advisory conditions once again over the I-35 corridor and coastal plains. Expect nearly identical conditions for Monday as the high continues to elongate and push off to the north and east. This should allow most of the area to continue to see high temperatures in the upper 90s to near 103 degrees particularly across the southern part of the area. Additionally we could see some very isolated showers and thunderstorms form across the Coastal Plains with the continued Seabreeze.

SHORT TERM

(Today through Monday) Issued at 1245 AM CDT Sun Sep 13 2026

The ridge currently impacting our area will move over North Texas today thus keeping rain chances low once again. The main exception would be for the coastal plains. Highs should be a degree or two today but could still support Heat Advisory conditions once again over the I-35 corridor and coastal plains. Expect nearly identical conditions for Monday as the high continues to elongate and push off to the north and east. This should allow most of the area to continue to see high temperatures in the upper 90s to near 103 degrees particularly across the southern part of the area. Additionally we could see some very isolated showers and thunderstorms form across the Coastal Plains with the continued Seabreeze.

LONG TERM

(Monday night through Saturday) Issued at 1245 AM CDT Sun Sep 13 2026

An upper level ridge will continue to be centered northeast of our area through at least the middle of next week, and began expanding further west later in the week. Highs once more will continue to range from the middle 90s to just above 100 degrees each day through the middle of next week. Heat indices will continue hovering around the 105-108 degree mark near the I-35 corridor and coastal plains. Seabreeze showers and thunderstorms could impact the coastal plains every afternoon into the evening. Most other locations should see mainly dry conditions. Towards the end of the forecast period models are hinting at a pattern shift which would finally drop temperature below 100 degrees and perhaps see better chances for rain coverage over the area. Models continue to disagree on how this occurs so continue to check back as we get closer and models hopefully come into better agreement.

AVIATION

(12Z TAFS) Issued at 602 AM CDT Sun Sep 13 2026

Morning low cloudiness was more aggressive Saturday than from recent days as the onshore flow may have been enhanced by an inverted trough over Mexico undercutting a broad ridge over the central CONUS. This general pattern remains intact for today, so will follow the persistence trend with the 3 I-35 sites. Winds will also remain diurnally consistent with those of Saturday with some SE gusts to around 25 knots in the early evening. More low stratus are scheduled for Monday morning.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 78 101 77 101 / 0 10 0 0 Austin Bergstrom Intl Airport 77 100 77 100 / 0 10 0 0 New Braunfels Muni Airport 77 99 75 100 / 0 10 0 0 Burnet Muni Airport 76 97 74 97 / 0 0 0 0 Del Rio Intl Airport 78 100 78 101 / 0 0 0 0 Georgetown Muni Airport 77 100 76 100 / 0 0 0 0 Hondo Muni Airport 76 100 74 100 / 0 0 0 0 San Marcos Muni Airport 76 100 75 100 / 0 10 0 0 La Grange - Fayette Regional 77 100 77 100 / 0 30 0 10 San Antonio Intl Airport 78 99 77 99 / 10 0 0 0 Stinson Muni Airport 78 101 77 101 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

Heat Advisory from noon today to 7 PM CDT this evening for TXZ173-191>194-205>209-220>225.