textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 537 AM CDT Fri Sep 4 2026

- Low to medium (15-45%) rain and storm chances today into the weekend; few locally heavier downpours today may lead to nuisance ponding or minor flooding.

- Moisture levels stick around into next week with continued rain chances across the Coastal Plains with the sea breeze.

- Above average heat continues with elevated heat indices, mostly along and east of the I-35 corridor into the Rio Grande Plains.

SHORT TERM

(Today through Saturday) Issued at 1250 AM CDT Fri Sep 4 2026

Leftover mid-level dynamics and moisture in association with the remnants of Edouard drifts to the southwest across the region today. Activity is expected to get an early start where a cluster of scattered showers and few storms develop late in the overnight hours and into the morning, with an initial focus across our northeastern and eastern counties, including the Austin area. The activity with time gradually looks to trend towards the west-southwestward through the day. Latest guidance actually indicates there may be a bit of a decline in the overall coverage along the I-35 corridor later this afternoon with a primarily focus for activity concentrating over the Coastal Plains and from the Hill Country into the southern Edwards Plateau. PWATs will reside in the 1.8 to 2.1 inch range. This will support the ability for any heavier storm cells to produce a quick inch or two in spots. In these cases, there may be the potential for some ponding on roadways and perhaps some minor flooding. WPC does highlight a level 1 of 4 risk for excessive rainfall leading to flooding over portions of the region. Activity should diminish beyond sunset with the loss of daytime heating. Moisture and some of the mid-level energy, now mostly to the south-soutwest lingers for Saturday to allow for another opportunity for some isolated to scattered showers and storms. This activity looks to primarily focus during the afternoon across the higher terrain of the western Hill Country into the Southern Edwards Plateau and across much of the Coastal Plains.

With an early start to activity today and cloud cover spreading over the region, temperatures are forecast to trend lower across much of the area from the Hill Country to the I-35 corridor and into the Coastal Plains. We have highs in the low to mid 90s mainly for this region. Farther west, where more sunshine is expected, highs look to approach or enter the triple digits. Saturday is forecast to be a little warmer with more sun across the region from the morning into the early afternoon as any isolated to scattered activity looks to wait until peak daytime heating before developing unlike today's morning forecast for early day activity. While this morning's lows begin very warm and muggy from the mid 70s to near 80 degrees, lows entering Saturday morning look to trend a little lower, with most in the low to mid 70s.

LONG TERM

(Saturday night through Thursday) Issued at 1250 AM CDT Fri Sep 4 2026

Moisture levels remain elevated in the upcoming workweek with PWATs sitting near the 75th percentile for this time of year (1.7 to 1.9 inches) in the eastern half of the region. This is influenced by a TUTT low and weak inverted troughing that advances west over the northern Gulf towards Texas from Sunday into Labor Day. This and a persistent light to moderate southeasterly onshore flow helps to promote daily chances of isolated to scattered sea breeze rain showers and storms for areas east of the I-35 corridor over the Coastal Plains. Elsewhere, chances through the week are quite minimal. Above average heat will continue with highs in the mid 90s to near 100 degrees and elevated heat indices that reach into the 103 to 108 degree range for many along and to the east of I-35. Overnights stay warm and humid as well in the low to mid 70s.

AVIATION

(12Z TAFS) Issued at 537 AM CDT Fri Sep 4 2026

There is a mix of VFR and MVFR cigs across the local area terminals as of 11Z. Also, light rain is pushing across the northern Hill Country moving to the southwest. This trend continues through the morning hours with light rain likely affecting KAUS. Removed -TSRA from previous forecast package for KAUS based on radar trends and latest NBM guidance. Cigs are forecast to improve to VFR for the I-35 sites by 15Z. KDRT stays VFR for this forecast cycle. Southerly winds are forecast to dominate the local area for most of the day and evening with speeds 10 knots or less for the majority of time and gusts as high as 22 knots. Most of the precipitation for this afternoon and evening to stay across the southern Edwards Plateau/western Hill Country and Coastal Plains. However, a few showers or storms could not be ruled out over the I-35 corridor including KAUS and KSAT sites.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 95 76 98 76 / 30 10 10 10 Austin Bergstrom Intl Airport 95 76 97 75 / 30 10 20 10 New Braunfels Muni Airport 95 75 97 75 / 20 10 20 10 Burnet Muni Airport 91 73 95 74 / 50 10 10 10 Del Rio Intl Airport 100 78 99 77 / 10 10 10 10 Georgetown Muni Airport 93 75 96 75 / 40 0 10 10 Hondo Muni Airport 96 74 97 74 / 20 10 20 10 San Marcos Muni Airport 95 74 97 74 / 20 10 20 10 La Grange - Fayette Regional 95 76 96 76 / 30 10 30 10 San Antonio Intl Airport 95 76 97 77 / 20 10 10 10 Stinson Muni Airport 97 77 99 77 / 20 10 20 10

EWX WATCHES/WARNINGS/ADVISORIES

None.