textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 524 AM CDT Tue Sep 8 2026

- Daily sea breeze thunderstorm chances in the Coastal Plains through the rest of the week.

- Humid conditions with above average temperatures and peak heat indices will continue.

UPDATE

Issued at 524 AM CDT Tue Sep 8 2026

Based on latest guidance, I have updated the forecast for the mid to late afternoon and early evening to add isolated shower and thunderstorm activity to expand it into the I-35 corridor which includes the Austin metro. San Antonio metro stays dry.

SHORT TERM

(Today through Wednesday) Issued at 1236 AM CDT Tue Sep 8 2026

A large and expansive upper level ridge currently located over Oklahoma continues to influence our area when looking at upper air analysis. Temperatures will remain above normal with highs in the upper 90s to low 100s for today. Wednesday we could see similar conditions but a few degrees cooler with upper 90s expected for most with heat indices once again just below or near advisory criteria. We could see some isolated showers/storms across the Edwards Plateau and Hill Country as recent Hi-res guidance has been pretty aggressive so have added in very low pops (10%) otherwise most areas should once again remain hot and dry.

LONG TERM

(Wednesday night through Monday) Issued at 1236 AM CDT Tue Sep 8 2026

Not much change expected in the long term as the strong upper level ridge eventually breaks down over the northern part of the country. However, it will continue to control the weather across the southern states. We will remain under southeasterly low level flow which will continue to keep hot, moist air over South-Central Texas. Additionally, we could see some seabreeze convection occur daily through the rest of the week mainly over the Coastal Plains, but chances remain rather low. Otherwise expect the majority of our area to remain hot and dry with highs in the upper 90s to near 100 each day and lows in the low to mid 70s. We could likely see heat indices just shy of heat advisory criteria (108+ degrees) as moisture will remain across the area. Continue to check back to future forecasts and remember to practice safe heat safety.

AVIATION

(12Z TAFS) Issued at 524 AM CDT Tue Sep 8 2026

VFR conditions are forecast for the local area terminals through this cycle. Light southerly winds are forecast through late this morning. Then, wind speeds increase to average between 5 to 10 knots in the afternoon and early evening. May be a bit gusty early evening with the passage of the seabreeze or any shower/storm activity near KAUS. I decided to keep out mentioning shra/tsra due low confidence. Late evening into Wednesday morning, light southerly winds dominate.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 101 77 99 77 / 20 20 10 10 Austin Bergstrom Intl Airport 100 77 99 77 / 20 20 10 10 New Braunfels Muni Airport 99 76 98 75 / 20 20 10 10 Burnet Muni Airport 98 75 96 74 / 10 0 10 10 Del Rio Intl Airport 101 78 99 78 / 0 0 0 0 Georgetown Muni Airport 100 77 98 76 / 10 20 10 10 Hondo Muni Airport 99 75 98 74 / 0 0 0 0 San Marcos Muni Airport 100 76 98 75 / 20 20 10 10 La Grange - Fayette Regional 100 77 98 77 / 20 0 20 0 San Antonio Intl Airport 99 78 97 77 / 10 10 10 0 Stinson Muni Airport 101 78 99 77 / 10 0 10 0

EWX WATCHES/WARNINGS/ADVISORIES

None.