textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 638 AM CDT Tue Sep 15 2026 - A Heat Advisory is in effect for the coastal plains, Williamson, and Travis Counties today from noon to 7 PM.

- Near critical fire weather conditions are forecast for the southern Edwards Plateau and the Rio Grande Plains.

- Low rain chances in the coastal plains through late week, spreading further inland Thursday.

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

SHORT TERM

(Today through Wednesday) Issued at 1200 AM CDT Tue Sep 15 2026

Hot and breezy conditions continue today with widespread highs from the mid 90s to around 103 degrees. Humid conditions in the east bring heat index values back into the 108-110 degree mark notably for locations in the northeast portion of the forecast area, though values from 105-108 degrees are still noted elsewhere. A Heat Advisory remains in effect for today from noon to 7 PM for portions of the area, though all should take heat precautions as the summer isn't over yet. We may finally be able to break the Heat Advisory streak on Wednesday with a slight decrease in highs expected, though we cannot rule out one just yet.

As mentioned previously, breezy southeasterly wind increases by the afternoon and continues into the evening. Gusts may range between 20- 30 mph at times before decreasing late tonight. A decrease in winds is noted on Wednesday.

Ridging over the southeast US will keep conditions mostly dry through the short term period with only low rain chances over the coastal plains each afternoon/evening.

LONG TERM

(Wednesday night through Monday) Issued at 1200 AM CDT Tue Sep 15 2026

A westward drifting upper-level ridge will elongate over South Central Texas Thursday before an upper low in the Gulf and a trough to the west eventually force this feature south of the area late this weekend. With southerly flow at the surface, increased moisture continues over the area this week most notably Thursday and and Thursday night as a surge of higher PWAT values moves inland over South Central Texas. While rain chances extend over much of the area during this time, we are not expecting widespread shower and thunderstorm activity as the upper ridge continues to influence the area. Upper ridging looks to linger over the area through much of the weekend keep rain chances either out of the area or low during this time. Towards the very end of the forecast period, a series of shortwaves could impact Texas and could bring some additional rain chances and possibly a slight decrease in temperatures, but details remain uncertain.

AVIATION

(12Z TAFS) Issued at 638 AM CDT Tue Sep 15 2026

MVFR cigs are noted on satellite and surface observations and we expect these clouds to continue along the I-35 corridor through mid-morning. Low clouds will then mix out, leaving VFR skies through the remainder of today. South to southeast winds will be gusty at times, especially during the afternoon and evening hours.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 102 77 100 78 / 0 0 0 0 Austin Bergstrom Intl Airport 101 76 99 77 / 0 0 0 0 New Braunfels Muni Airport 100 75 98 75 / 0 0 0 0 Burnet Muni Airport 98 73 96 74 / 0 0 0 0 Del Rio Intl Airport 101 76 100 77 / 0 0 0 0 Georgetown Muni Airport 100 76 99 77 / 0 0 0 0 Hondo Muni Airport 100 73 98 74 / 0 0 0 0 San Marcos Muni Airport 101 75 99 75 / 0 0 0 0 La Grange - Fayette Regional 100 77 99 77 / 10 0 10 0 San Antonio Intl Airport 100 77 98 78 / 0 0 0 0 Stinson Muni Airport 102 76 100 77 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

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