textproduct: Austin/San Antonio

KEY MESSAGES

- Isolated showers and storms can be expected today and again Wednesday, mainly over the coastal plains into the Interstate 35 corridor.

- A warming trend continues through much of the week with afternoon heat indices on the rise.

- Rain chances trend upward late this weekend into early next week.

SHORT TERM

(Tonight through Wednesday night) Issued at 156 PM CDT Tue Jun 9 2026

Some isolated showers are ongoing across portions of the southern Edwards Plateau, Rio Grande plains and coastal plains. With continued daytime heating, we expect to see a continuation of isolated to convection over the mentioned areas and farther east into the Hill Country and I-35 corridor. Coverage of showers and storms will not be as high as yesterday. Some brief heavy rainfall, gusty outflow winds and lightning strikes will be the main concern with any thunderstorms. Activity should be on the decrease after sunset, with clouds set to increase leading to another warm and humid night. Little change in the overall weather pattern is anticipated on Wednesday, with isolated showers and storms favored for areas mainly along and east of the I-35/I-37 corridors.

Daytime highs in the lower to middle 90s along with continued humid conditions thanks to recent rains and southeast winds will help push heat index values into the 100 to near 105 degree range over the next couple of days.

LONG TERM

(Thursday through next Tuesday) Issued at 156 PM CDT Tue Jun 9 2026

Mid and upper level high pressure persists over the region Thursday and for now we will keep the forecast dry. We can't rule out some isolated showers near the coastal plains, but coverage of convection should be fairly low and will not mention in the forecast at this time. The mid and upper level high pressure persists into the upcoming weekend, but will eventually begin to be displaced southward as westerly flow aloft increases in advance of an upper trough over the northern Rockies. This weakening of high pressure along with afternoon heating should be enough to allow rain chances to start a slow increase for mainly late this weekend into early next week. Daytime highs in the 90s and humid conditions will still be able to produce afternoon heat index values in the 100 to near 105 degree range into early next week.

The medium range models are also showing some increasing agreement in a cold front dropping southward into the region early next week. While the strength of the northerly winds behind the GFS looks a little overdone, there is some support for a cold front to drop southward into the region based on the broad, upper trough over the central and southern plains states. Timing of the front remains in question, but would tend to favor a Tuesday arrival closer to the ECMWF solution.

AVIATION

(00Z TAFS) Issued at 630 PM CDT Tue Jun 9 2026

Few changes to the going forecast. It remains on track with MVFR to borderline IFR ceilings expected after 07Z at AUS, SAT, and SSF and MVFR ceilings at DRT after 11Z. Winds will remain between 5-10 kts overnight, increasing to 10-15 kts and gusting to 20-22 kts at times Wednesday afternoon along with a return to VFR ceilings.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 76 93 77 94 / 20 20 10 0 Austin Bergstrom Intl Airport 76 93 77 94 / 20 20 10 10 New Braunfels Muni Airport 74 92 75 93 / 20 20 20 10 Burnet Muni Airport 74 92 75 92 / 10 10 10 0 Del Rio Intl Airport 76 95 77 97 / 10 0 0 0 Georgetown Muni Airport 75 93 77 93 / 20 20 10 0 Hondo Muni Airport 74 91 75 93 / 20 10 10 0 San Marcos Muni Airport 75 93 76 93 / 20 20 20 10 La Grange - Fayette Regional 76 92 77 94 / 20 30 20 10 San Antonio Intl Airport 75 92 77 93 / 20 20 10 10 Stinson Muni Airport 75 93 76 94 / 20 20 10 10

EWX WATCHES/WARNINGS/ADVISORIES

None.