textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 1255 PM CDT Mon Sep 14 2026

- Heat Advisory for the I-35 Corridor and Coastal Plains today and for Coastal Plains, Williamson, and Travis Counties Tuesday.

- Low rain chances (10-20%) each day through the week, mainly over the Coastal Plains.

- Humid morning conditions and above average temperatures continue through the the week.

SHORT TERM

(Tonight through Tuesday night) Issued at 1255 PM CDT Mon Sep 14 2026

Mid-level ridging is noted on regional water vapor imagery, primarily centered over the southeastern CONUS. On the southwestern periphery of this ridge, a weak upper low will slide westward today and tomorrow, helping to enhance the seabreeze. This will result in isolated to possibly scattered showers and storms over the Coastal Plains today and again Tuesday. Not to be outdone, the added moisture has been rather notable the last several days with muggy, nasty mornings in the upper 70s to lower 80s and hot/humid afternoons and highs in the mid 90s to around 103. Factoring in the humidity will make it feel like 108-111 for the I-35 Corridor and Coastal Plains today, but a shift a bit further east in the highest heat indices is expected tomorrow. Most locations will remain hot and dry but you may get lucky with a quick downpour this afternoon or Tuesday afternoon.

LONG TERM

(Wednesday through next Monday) Issued at 1255 PM CDT Mon Sep 14 2026

Wednesday and Thursday will bring the best shot at rain in some time, but it's not a washout by any means. The aforementioned upper low over the northern Gulf will move inland and then be absorbed by the mid-level ridge by Thursday. Despite this scenario, some showers and storms are expected and coverage should be higher than Monday and Tuesday as moisture works further inland. Beyond Thursday, the ECMWF and GFS are in disagreement on the long term pattern, with notable differences with the development of a large scale trough out west and what may transpire as an inverted trough slides east over the northern Gulf this upcoming weekend. For now, will stick with the NBM, but things could certainly become more active towards the weekend if things line up properly.

AVIATION

(18Z TAFS) Issued at 1233 PM CDT Mon Sep 14 2026

Most sites have returned to VFR CIGs, expect this to continue through this evening before MVFR CIGs make a return in the pre dawn hours 08/09Z for KSSF and KSAT. There is a very low chance (less than 20 percent) for an isolated shower or storm but have kept mention out of this TAF package for now. Much like the past couple days, shower and storm activity may try to progress westward with the seabreeze but its unclear how far west it gets. For KAUS VFR CIGs expected throughout the period but there is a possibility seeing MVFR CIGs overnight however models are not in agreement so have kept out of TAFs for now. Expect VFR CIGs to return to all I-35 TAF sites by 13/14Z tomorrow. VFR and gusty SE winds expected throughout the period for KDRT.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 77 102 77 100 / 0 0 0 0 Austin Bergstrom Intl Airport 77 101 76 100 / 10 0 0 0 New Braunfels Muni Airport 77 100 75 99 / 0 0 0 10 Burnet Muni Airport 75 98 73 96 / 0 0 0 0 Del Rio Intl Airport 78 101 76 100 / 0 0 0 0 Georgetown Muni Airport 77 101 76 99 / 0 0 0 0 Hondo Muni Airport 75 100 73 99 / 0 0 0 0 San Marcos Muni Airport 76 101 75 99 / 10 0 0 10 La Grange - Fayette Regional 77 101 76 99 / 0 0 0 10 San Antonio Intl Airport 77 100 77 98 / 0 0 0 10 Stinson Muni Airport 77 102 76 100 / 0 0 0 10

EWX WATCHES/WARNINGS/ADVISORIES

Heat Advisory until 7 PM CDT this evening for TXZ173-191>194- 205>209-220>225.

Heat Advisory from noon to 7 PM CDT Tuesday for TXZ173-192>194- 209-225.