textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 122 PM CDT Wed Aug 12 2026

- Hot and mostly dry summer weather continues this week. Practice heat safety and stay cool and hydrated.

SHORT TERM

(Tonight through Thursday night) Issued at 122 PM CDT Wed Aug 12 2026

Rinse and repeat hot summer weather, minus the rinsing, persists for South Central Texas. GOES-derived soundings show a broad plume of drier air is being swept into our area by the dominant ridge in the Gulf. Mostly clear skies are forecast during the early part of the night across the region. This should provide initially good viewing for the Perseids meteor shower, which peaks after midnight with occasional meteors emanating from the northeast. However, we do expect cloud cover to gradually trend from clear skies around midnight to cloudier skies in pre-dawn hours as the typical low stratus builds along and east of the I-35 corridor with some extension into the southern Hill Country. Modeled low-level humidity profiles do suggest moisture tonight will be slightly lower than the other nights this week, so perhaps the overall nocturnal cloud cover could be slightly better compared to what we've seen so far. Expect mild temperatures in the 70s during the late night and early morning.

Thursday will be hot and dry again. Drier mid-level air may slightly aid in alleviating the heat, but temperatures are expected to stay hot with highs in the 99 to 103 range for most of the area. Peak afternoon heat indices should reach the 104 to 108 range below the Balcones Escarpment and along the Rio Grande. Breezy afternoon winds are also expected to reach their apex on Thursday thanks to a strong pressure gradient enforced by high pressure over the Gulf and hot temperatures over the Central Plains. Breezy winds southeast of 10- 20 mph with gusts to 25-30 mph are possible throughout the daytime.

LONG TERM

(Friday through next Wednesday) Issued at 122 PM CDT Wed Aug 12 2026

Little substantive change is expected in the weather over the next several days. Conditions remain hot and opportunities for rain will be hard to come by as ridging strengthens over the area. Afternoon breezes are expected to trend downward after Friday as high pressure over the Gulf broadens. A weak inverted trough is forecast to move onshore South Texas on Friday. The increase in moisture may be accompanied by isolated showers from the Coastal Plains to Winter Garden region, though rain chances are low (below 30 percent). That may be our only window for rain within the next 10 days. The more noteworthy change is that the passing disturbance could raise heat indices by a few degrees, especially over the Coastal Plains and I35 corridor where conditions could meet Heat Advisory criteria. Moisture is expected to decrease over the weekend into next week, but hot weather will continue to prevail with highs regularly straddling 100F.

AVIATION

(18Z TAFS) Issued at 1117 AM CDT Wed Aug 12 2026

VFR flight conditions under mostly to completely clear skies this afternoon through late this evening. Otherwise, the main item to note would be breezy south-southeasterly winds with the highest gusts with and after the inland push of the sea breeze towards and after sunset. Peak gusts of around 25 kts are expected. Winds subside beyond midnight and low stratus with MVFR ceilings will develop along and near the Balcones Escarpment into Thursday morning. Have added a prevailing MVFR group at KSAT and KSSF for this stratus deck and TEMPO MVFR conditions at KAUS around 11Z to 14/15Z. The low clouds erode and VFR ceilings return with increasing south-southeasterly breezes into and through Thursday afternoon.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 77 101 77 98 / 0 0 0 10 Austin Bergstrom Intl Airport 77 101 77 99 / 0 0 0 10 New Braunfels Muni Airport 76 101 76 98 / 0 0 0 10 Burnet Muni Airport 74 98 74 96 / 0 0 0 0 Del Rio Intl Airport 78 102 77 99 / 0 0 0 0 Georgetown Muni Airport 76 100 76 97 / 0 0 0 10 Hondo Muni Airport 75 100 75 97 / 0 0 0 10 San Marcos Muni Airport 76 101 76 98 / 0 0 0 10 La Grange - Fayette Regional 77 100 77 98 / 0 0 10 20 San Antonio Intl Airport 77 100 78 97 / 0 0 0 10 Stinson Muni Airport 77 102 78 99 / 0 0 0 10

EWX WATCHES/WARNINGS/ADVISORIES

None.