textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 534 AM CDT Mon Aug 17 2026

- A dry and rain free weather regime continues this new work week into this weekend. Practice heat safety and stay cool and hydrated.

SHORT TERM

(Today through Tuesday) Issued at 1202 AM CDT Mon Aug 17 2026

Dry and hot conditions persist for the short term forecast period. Overnight lows are forecast to range from the low to mid 70s. Can't rule out a few spots getting down to the upper 60s. Clouds begin to develop overnight through the mid Monday morning time frame. Humidity levels are likely to stay elevated over parts to the east of the Interstate 35 and Coastal Plains. Therefore, expect patchy to areas of fog to develop over portions of these locations by day- break and dissipating mid morning. Mostly sunny to sunny skies are then forecast for the afternoon period as mixing takes place. Monday's highs are going to be similar to those of Sunday, ranging from the upper 90s across most of the Hill Country and 100 to 103 for the rest of South Central Texas. When looking at pwat values and dewpoint temperatures for this afternoon (50s and 60s) for most places, it looks to be the driest day for this week. With that said, it is going to be hot, however, a more comfortable heat versus having dewpoints in the upper 60s to low 70s. Heat index values stay at or slightly higher than the ambient temperatures with highest values across the Coastal Plains and southern Rio Grande Plains ranging from 103 to 107.

The pattern repeats with clouds developing late evening and then lasting through Tuesday morning. Mostly sunny to sunny skies follow and daytime highs reaching the upper 90s and up to 103 across most of South Central Texas. Can't rule out higher temperatures over few spots across the southern Rio Grande Plains. Since both temperatures and heat index values stay on check, no heat product headlines needed. However, stay cool and hydrated.

LONG TERM

(Tuesday night through Sunday) Issued at 1202 AM CDT Mon Aug 17 2026

A dry and hot weather pattern persists through the rest of the work week into the weekend as the region remains under the influence of sub-tropical ridging. The ridging reposition a bit towards late week into the weekend, with the center axis becoming established across the southwest CONUS. Nonetheless, the hot and rain-free forecast continues across South Central Texas with the daytime highs running a bit higher than climate normal values.

AVIATION

(12Z TAFS) Issued at 534 AM CDT Mon Aug 17 2026

MVFR ceilings have developed over portions of the Hill Country, Coastal Plains and I-35 corridor including at KSAT/KSSF. There is higher confidence KAUS will remain VFR this morning, therefore have taken any mention of BKN ceilings out of the TAF this update. Low clouds dissipate mid-morning, then mostly clear skies and VFR conditions are expected the rest of the day across South Central Texas. Southerly wind will be under 10 knots most of the period, though some occasional gusts up to 20 knots cannot be ruled out in the afternoon, particularly in the west near KDRT.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 103 77 102 79 / 0 0 0 0 Austin Bergstrom Intl Airport 102 76 101 78 / 0 0 0 0 New Braunfels Muni Airport 101 75 101 76 / 0 0 0 0 Burnet Muni Airport 101 74 100 76 / 0 0 0 0 Del Rio Intl Airport 101 78 100 77 / 0 0 0 0 Georgetown Muni Airport 101 77 100 79 / 0 0 0 0 Hondo Muni Airport 100 74 100 75 / 0 0 0 0 San Marcos Muni Airport 101 75 100 76 / 0 0 0 0 La Grange - Fayette Regional 101 76 100 77 / 0 0 0 0 San Antonio Intl Airport 100 77 100 77 / 0 0 0 0 Stinson Muni Airport 102 77 101 77 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.