textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 512 AM CDT Wed Sep 9 2026

- Rain chances today and Thursday over the coastal plains region as well as the Hill Country and southern Edwards Plateau.

- Low rain chances shrink back to the coastal plains Friday through the upcoming weekend, with dry weather elsewhere.

- Temperatures remain above normal through the period, with some concerns for maximum temperatures and peak heat index values near Heat Advisory levels this weekend.

SHORT TERM

(Today through Thursday) Issued at 1215 AM CDT Wed Sep 9 2026

A weak, mid-level disturbance moving inland from the northwestern Gulf will bring a subtle increase in moisture to the region today. This along with daytime heating should help generate some isolated to scattered showers and storms across the coastal plains region as well as the Hill Country and southern Edwards Plateau. The coastal plains will see the best chance for rainfall today and again Thursday. Some slow-moving showers and storms may produce up to around 1 inch of rainfall. Rain chances on Thursday should be fairly similar to Wednesday as models indicate a weakness in the mid-levels still hanging out in the vicinity of the northwestern Gulf. Temperatures will change little through Thursday with highs in the mid 90s to lower 100s. A few spots in the coastal plains may briefly see peak heat index values near 108 degrees.

LONG TERM

(Thursday night through Tuesday) Issued at 1215 AM CDT Wed Sep 9 2026

For Friday into the upcoming weekend, the models generally agree in showing some remnant mid-level weakness remaining over the northwestern Gulf, with weak ridging building in from the west. Any rain chances should be confined to the coastal plains region, with dry weather expected elsewhere. Models indicate a slight increase in 850mb temperatures and this may translate into a degree or two upward nudge in temperatures across the region. We will continue to monitor for the possibility of maximum temperatures and peak heat index values near Heat Advisory criteria for areas generally along and east of Interstate 35 for the upcoming weekend.

For early next week, mid and upper level high pressure builds over the southeastern U.S. allowing for a deeper south to southeasterly flow in the lower and mid-levels of the atmosphere to develop. No significant change in temperatures are anticipated with both high and low temperatures likely to remain above climatological normals. Some low rain chances will likely persist over the coastal plains, with dry weather expected elsewhere.

AVIATION

(12Z TAFS) Issued at 512 AM CDT Wed Sep 9 2026

VFR conditions are forecast for the local area terminals for the most part. However, there are some MVFR cigs passing along the I-35 corridor and may affect the Austin and San Antonio sites for an hour or so or through 13Z. Latest guidance suggest for VFR through prevail for most of the day and evening periods. A southerly wind flow of 7 to 10 knots is forecast to stay in place mid to late morning through this evening. Then winds decrease late tonight. Any shower or storm activity is to stay away from local area airports.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 100 77 99 76 / 10 0 10 0 Austin Bergstrom Intl Airport 99 76 99 76 / 10 0 10 0 New Braunfels Muni Airport 98 75 98 74 / 10 10 10 10 Burnet Muni Airport 96 74 96 74 / 20 20 10 10 Del Rio Intl Airport 100 77 100 77 / 0 0 0 0 Georgetown Muni Airport 98 75 98 75 / 10 0 10 10 Hondo Muni Airport 98 74 97 74 / 0 10 10 10 San Marcos Muni Airport 98 74 98 74 / 10 10 10 0 La Grange - Fayette Regional 98 76 98 76 / 30 0 20 10 San Antonio Intl Airport 97 77 97 77 / 10 10 10 10 Stinson Muni Airport 99 77 98 76 / 10 10 10 0

EWX WATCHES/WARNINGS/ADVISORIES

None.