textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 751 AM CDT Mon Jul 20 2026

- We will continue to see more improvement to our flood waters over the next few days with only a few elevated levels in the Nueces, Frio, San Antonio and Rio Grande basins. Avoid flooded areas.

- Temperatures will continue to rise to more seasonal July levels throughout this week, couple that with some higher humidity levels and we will reach dangerous heat index values.

- While the forecast remains dry, we are watching Tropical Depression Two over the northeaster Gulf, which could track towards Texas by Thursday or Friday.

UPDATE

Issued at 751 AM CDT Mon Jul 20 2026

Only minor updates to the forecast have been made this morning to account for recent observational trends in the dew point temperatures. We have also increased sky cover over the Rio Grande plains and portions of the southern Edwards Plateau.

SHORT TERM

(Today through Tuesday) Issued at 1238 AM CDT Mon Jul 20 2026

River flooding will continue to see some improvements over the next coming days as runoff continues downstream for the Nueces, Frio, San Antonio, and Rio Grande Basins, however, we are monitoring for an additional rise along the Nueces River near Asherton today, with only limited impacts to areas along the riverbank. Otherwise, the main story through Tuesday will be the seasonably hot and dry conditions that are expected across the region as upper-level ridging continues to strengthen. Highs today will generally range from the lower 90s across the Southern Edwards Plateau to the mid and upper 90s elsewhere, although some areas across the far south Rio Grande Plains could reach the century mark by this afternoon.

Heat index values today will reach the 100 degree mark for much of the area, with those who don't still reaching the upper 90s. Still not quite there with reaching Heat Advisory criteria, despite some being issued just the to the northeast of the area, but the conversations are being had for later in the week. After a mild night tonight, temperatures on Tuesday will be very similar to today, although readings might be a degree or two higher than what we will see today, especially the closer you get to the southern and eastern portion of the region. We will still be borderline for reaching any of our heat headline criteria at this time for Tuesday, but that doesn't mean it won't be hot, a good reminder to know the signs and symptoms of heat related illnesses.

LONG TERM

(Tuesday night through Sunday) Issued at 1238 AM CDT Mon Jul 20 2026

Temperatures will continue to increase as we head into the middle of the week, with NBM spitting out a number off 100+ degree temperatures for Wednesday afternoon. Factor in our dew points and Wednesday is looking like it could be a day for some heat headlines for at least portions of the area. That being said, I think we will still be somewhat borderline, and the issuance could go either way depending on how things trend. Regardless, Wednesday and Thursday will be hot across the region and precaution should be used if you are spending an extended period of time outdoors.

The last half of the week becomes a little more tricky to forecast. While it will still be hot, we are keeping an eye on the tropics as Tropical Depression 2 formed in the northeastern Gulf. This system will slowly move westward through the northern Gulf through late Tuesday or Wednesday before moving towards the upper or middle Texas coast Thursday into Friday. There is much uncertainty with the track and intensity of this system and the impact that it will have on our region. Being that we are not far removed from recent flooding across the area, we will continue to monitor this situation closely. It is important to make sure that you use trusted sources throughout the week to find out the latest information.

AVIATION

(12Z TAFS) Issued at 524 AM CDT Mon Jul 20 2026

MVFR cigs are forecast for the I-35 sites through 13Z with cigs improving to MVFR by 14Z and continuing like that through the rest of the forecast period. Southeast to south winds of 5 to 10 knots are forecast for all area terminals through the forecast period.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 97 73 99 78 / 0 0 0 0 Austin Bergstrom Intl Airport 96 72 97 76 / 0 0 0 0 New Braunfels Muni Airport 96 71 97 73 / 0 0 0 0 Burnet Muni Airport 97 72 98 76 / 0 0 0 0 Del Rio Intl Airport 94 74 95 74 / 0 0 0 0 Georgetown Muni Airport 97 73 98 78 / 0 0 0 0 Hondo Muni Airport 95 71 96 72 / 0 0 0 0 San Marcos Muni Airport 96 70 97 73 / 0 0 0 0 La Grange - Fayette Regional 98 72 100 76 / 0 0 0 0 San Antonio Intl Airport 95 72 97 74 / 0 0 0 0 Stinson Muni Airport 97 72 97 75 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.