textproduct: Austin/San Antonio

KEY MESSAGES

Updated at 1224 PM CDT Sun Aug 16 2026

- August heat and a mainly rain free weather regime continues this week. Practice heat safety and stay cool and hydrated.

SHORT TERM

(Tonight through Monday night) Issued at 1224 PM CDT Sun Aug 16 2026

This morning did see a corridor of fog setup from the eastern side of the San Marcos/New Braunfels area into portions of the coastal plains. This was due to lighter, calm winds and near the ground saturation as the morning low temperatures dipped close to the dew points, which were notably lower compared to the previous few mornings. A region of drier air, primarily focused near and to the east of the I-10/I-37 corridor is responsible for these lower dew points. Despite a lighter southerly flow compared to the previous few afternoons, expect through the diurnal heating process for the dew points across this same region to mix out to the mid to upper 50s and low 60s from this afternoon into the early evening. This yields to mostly sunny conditions and for afternoon highs to climb into the 100 to 103 degree range outside of the naturally cooler locations within the Hill Country. Heat indices, however, will remain closer to the ambient temperature. Farther west towards the Rio Grande, where slightly higher dew points should persist with closer proximity to an exiting upper low, temperatures may be a little harder to efficiently warm across this region as result.

The drier air focused across our eastern areas today should expand into the west from the overnight into Monday. Morning lows in the low to mid 70s will be common across the region, but do expect for isolated locations across the Hill Country and Edwards Plateau to begin the day in the 60s. While low clouds still may develop, especially near or west of San Antonio, towards sunrise, it should be less widespread in generally across the region as the past few overnights. However, given the lighter winds, we still may see a little bit of patchy fog for the coastal plains but the signal for this is weaker than what had occurred this morning. Monday trends with mostly to completely sunny skies and temperatures that will again efficiently warm into the 100 to 103 degree range for many, except for those naturally cooler locations with the terrain.

LONG TERM

(Tuesday through next Sunday) Issued at 1224 PM CDT Sun Aug 16 2026

A persistent weather pattern remains through the upcoming week as the region remains under the influence of sub-tropical ridging. The ridging does reposition a bit towards late week into the weekend, with the center axis becoming established across the Four Corners region. Nonetheless, the hot and primarily rain free forecast will continue across South-Central Texas with the daytime highs still running a bit above normal. Midweek features the driest air before humidity levels slowly creep back upwards with time from late week into the weekend. This would allow for a gradual increase in the potential for the returning of more morning low clouds but also perhaps a stray shower in association with the seabreeze.

AVIATION

(18Z TAFS) Issued at 1224 PM CDT Sun Aug 16 2026

VFR conditions have finally returned to all terminals and should stay VFR throughout the period at KAUS and KDRT. KSSF and KSAT look to return to MVFR conditions late overnight 08Z/09Z as a cloud deck forms over the terminals. This cloud deck should erode with VFR returning by late morning (15Z). Confidence is somewhat low as a upper level ridge will be approaching the area from the west leading to possibility that these clouds don't form over the sites. We will continue to closely monitor and amend as we get closer in time. As this ridge approaches we should see a wind shift overnight as well with winds briefly becoming south southwesterly before resuming a southerly motion as the ridge moves off to our north and west.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 75 102 77 102 / 0 0 0 0 Austin Bergstrom Intl Airport 72 102 75 101 / 0 0 0 0 New Braunfels Muni Airport 73 101 75 101 / 0 0 0 0 Burnet Muni Airport 73 101 74 100 / 0 0 0 0 Del Rio Intl Airport 77 101 78 100 / 0 0 0 0 Georgetown Muni Airport 74 101 76 100 / 0 0 0 0 Hondo Muni Airport 73 100 74 100 / 0 0 0 0 San Marcos Muni Airport 72 101 74 100 / 0 0 0 0 La Grange - Fayette Regional 73 101 76 100 / 0 0 0 0 San Antonio Intl Airport 75 100 77 100 / 0 0 0 0 Stinson Muni Airport 75 102 76 101 / 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.