textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 742 AM CDT Fri Sep 18 2026

- Low rain chances today for the coastal plains, portions of the I-35 corridor and Rio Grande plains.

- Above average temperatures continue through the weekend and next week.

UPDATE

Issued at 742 AM CDT Fri Sep 18 2026

Isolated showers and storms over the coastal plains continue to move northwestward into portions of the I-35/I-37 corridor this morning. Higher moisture levels from this region westward into portions of the Rio Grande plains is where rainfall chances will be favored today. We have updated the forecast to boost rain chances, mainly over the coastal plains region.

SHORT TERM

(Today through Saturday) Issued at 1221 AM CDT Fri Sep 18 2026

A weak perturbation at the southwest portion of the ridging dominating most of the nation's center and mid Atlantic areas, is generating scattered to broken clouds over the coastal plains, I-35 corridor, and Hill Country early this morning. Area Doppler radars are showing very little echos in the way of precipitation with trend continuing for most of the day on Friday. The exception of this is part of the Coastal Plains and Rio Grande where a few showers or a storm is possible. Highs will be in the lower to upper 90s and up to 101. Maximum heat index values to range from 100 to 107 across the Hill Country, I-35 corridor, and coastal plains. By mid to late afternoon, a dry airmass pushes from the east and spread across the local area and limiting rain chances.

By Saturday, the upper level high sits across northeast Texas and keeps a rain-free period across the local area.

LONG TERM

(Saturday night through Thursday) Issued at 1221 AM CDT Fri Sep 18 2026

Little changes to the weather pattern for Sunday across South Central Texas. However, the upper level ridge weakens and brings sea breeze convective activity along the coast in addition to an upper level trough moving across the southern Edwards Plateau. By Tuesday, the upper level high takes control and back to dry for the most parts. Dry weather conditions are forecast mid to late week.

AVIATION

(12Z TAFS) Issued at 524 AM CDT Fri Sep 18 2026

Very few changes to the previous forecast as things remain on track. MVFR ceilings are expected at DRT shortly with SAT and SSF possibly following suite between 12-15Z. Otherwise, expected VFR ceilings and east-southeasterly surface winds of 5-10 kts.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 99 73 99 74 / 0 0 0 0 Austin Bergstrom Intl Airport 99 73 99 74 / 0 0 0 0 New Braunfels Muni Airport 98 72 97 72 / 10 0 0 0 Burnet Muni Airport 96 71 95 71 / 0 0 0 0 Del Rio Intl Airport 97 77 99 76 / 10 0 10 0 Georgetown Muni Airport 98 73 98 74 / 0 0 0 0 Hondo Muni Airport 96 73 97 72 / 20 0 0 0 San Marcos Muni Airport 99 72 98 72 / 0 0 0 0 La Grange - Fayette Regional 97 71 97 72 / 0 0 0 0 San Antonio Intl Airport 97 75 97 75 / 20 0 0 0 Stinson Muni Airport 98 74 98 74 / 20 10 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.