San Antonio rolled into Tuesday, June 16, 2026, under muggy, partly cloudy skies and a warm start near 77°F. Scattered showers and thunderstorms are on tap through the day, with a high around 86°F and some storms capable of dropping brief, heavy downpours. A Flood Watch is still posted for parts of South‑Central Texas through Tuesday evening, and with soils already saturated, urban streets and low‑water crossings could flood quickly when stronger storms pass over.
Afternoon Storm Risk
According to the NWS Austin/San Antonio, rain chances climb to around 50% this afternoon, and any thunderstorm that develops could bring a burst of torrential rain. The heaviest bands are most likely over the Coastal Plains and far southern counties, where an additional 1–3 inches of rain is possible. Inland neighborhoods are not off the hook, though, with intense downpours and localized flash flooding still on the table. Northeast winds should stay light, around 5–10 mph, which means stronger cells may crawl over one area and drop a lot of water in a short time, which is a recipe for quick street flooding and backed‑up drainage.
Timing And Commute
Storm coverage is expected to peak between mid‑afternoon and early evening, then gradually wind down later tonight as temperatures slip to a low near 74°F. Wednesday trends drier with highs returning to the low 90s, while Thursday is poised to be the hottest day in this stretch. If you need help finding cool spaces or brushing up on heat safety, the City of San Antonio has resources available, and for more on how this pattern set up, check out our earlier look at the Alamo City heat and storms.
Hot, Humid Midweek
Drier air is expected to filter in on Wednesday, pushing highs into the low 90s and sending heat‑index readings up to around 100–105. By Thursday, actual temperatures may jump into the upper 90s, with heat indices that could top 110 in a few spots. Forecasters note that if this hot and humid pattern hangs on, heat advisories or other excessive‑heat alerts may be needed later in the week, so it is a good idea to schedule work and outdoor plans with the hotter hours in mind. For the latest detailed rundown, see the NWS Austin/San Antonio.
Safety Tips
If you are heading out, prep for a split personality weather day: bring water and find shade for the heat, and keep a poncho handy in case a slow‑moving storm parks over your area. Never drive through flooded streets and remember the mantra, Turn Around, Don’t Drown, and give crews room to work if you encounter standing water or barricades. Keep an ear on local alerts, move strenuous activities to the cooler parts of the day, and take a quick look at radar before you head outside while San Antonio navigates this sticky, storm‑prone stretch.
