textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 124 PM CDT Tue Aug 11 2026

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

- Afternoon temperatures each day stay around 100F throughout the week.

SHORT TERM

(Tonight through Wednesday night) Issued at 124 PM CDT Tue Aug 11 2026

Two subtropical ridges, one centered over New Mexico and the other over the eastern Gulf, are beginning to slowly pivot around each other with the pivot point roughly over Texas. The western ridge is bringing a warmer continental airmass aloft over the area while the eastern ridge is helping to steer a drier subtropical airstream at lower levels. These two factors support continued hot and dry summer weather this week. A spotty seabreeze shower or two is still in the cards for this afternoon over the Coastal Plains, but seabreeze shower activity looks more muted Wednesday and Thursday as drier air cycles across the area.

Wednesday is forecast to bring a small step up in temperatures as the aforementioned continental air moves into the area. Highs ranging from 99 to 102 are expected to be widespread, aside from the slightly cooler higher elevations in the Hill Country. While daytime mixing should bring dew points down to seasonable levels, the air is expected to remain humid enough to push heat indices into the 104- 108F range during the afternoon over the Coastal Plains and I-35 corridor. These forecast values are just below the threshold for Heat Advisory issuance, but regardless of specific criteria, it will nonetheless be hot and humid enough to cause issues if adequate heat safety is not followed. Winds could offer a slight respite from the heat as a breezy 10-15 mph southeast wind is expected across the area Wednesday afternoon thanks to the pressure differential provided by the passing blob of warmer air.

LONG TERM

(Thursday through next Tuesday) Issued at 124 PM CDT Tue Aug 11 2026

The streak of hot days is expected to continue through the weekend and into next week. Thursday may be the hottest day of the week by a slim margin with LREF mean 700mb temperatures aloft reaching 14C, or around the 98th percentile for much of the area. Daytime winds should remain on the breezier side through Friday. A temporary increase in moisture from the Gulf is anticipated Friday, but stable conditions due to the overarching presence of ridging keeps rain chances low, providing little aside from than prolonging high heat indices. We'll continue to monitor for the need to issue a Heat Advisory if one of these days becomes notably hotter than our recent streak of conditions, but reliable access to cooling and hydration will be needed regardless of whether those levels are met.

The mid level Gulf ridge slides into the lower Mississippi Valley over the weekend, but will then expand west into the Southern Plains early next week. This progression is well represented in ensembles and is a sign that hot summer conditions will continue with only minor fluctuations in air temperature and heat indices each day. Highs should stay in the upper 90s to low 100s while overnight lows should continue to stay in the mid to upper 70s for most. The northward jaunt of the ridge over the weekend could temporarily spruce up southeasterly flow just enough to allow a few isolated seabreeze showers to get going again over the Coastal Plains, but otherwise rain chances remain minimal through mid- August.

AVIATION

(18Z TAFS) Issued at 1209 PM CDT Tue Aug 11 2026

VFR conditions are forecast for the local terminals through late tonight. Breezy and gusty winds from the southeast are forecast to prevail for the rest of this afternoon into the evening period. Clouds return late tonight into Wednesday morning with MVFR cigs dominating through most of the period. Clouds break mid to late morning on Wednesday for VFR cigs. Breezy and gusty conditions return.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 77 101 76 101 / 0 0 0 0 Austin Bergstrom Intl Airport 77 100 77 101 / 0 0 0 0 New Braunfels Muni Airport 76 101 75 101 / 0 0 0 0 Burnet Muni Airport 75 99 74 98 / 0 0 0 0 Del Rio Intl Airport 78 102 77 103 / 0 0 0 0 Georgetown Muni Airport 76 99 76 100 / 0 0 0 0 Hondo Muni Airport 75 100 74 101 / 0 0 0 0 San Marcos Muni Airport 76 100 75 101 / 0 0 0 0 La Grange - Fayette Regional 77 99 77 99 / 0 0 0 0 San Antonio Intl Airport 78 100 77 100 / 0 0 0 0 Stinson Muni Airport 77 101 77 102 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.