San Antonio is waking up warm, gray, and sticky, with temperatures hovering near 72°F and heavy humidity hanging in the air. The quiet will not last. Forecasters expect the weather to turn unsettled Tuesday, with a shot at afternoon storms after 1 p.m. and a better chance for heavier, soaking rain late Tuesday night into early Wednesday.
Afternoon Into Overnight: Timing
Showers and thunderstorms are on the table after 1 p.m. Tuesday, May 26, 2026, as highs climb to around 86°F before easing back into the low 80s later in the afternoon. Rain chances sit around 30 to 40 percent during the afternoon, then ramp up to roughly 80 percent overnight. Localized spots could pick up 1 to 2 inches of new rain, enough to trigger flash flooding in vulnerable areas, according to the National Weather Service Austin/San Antonio.
Flood Safety And Commute Impacts
Downpours later in the day may slow or even stall the evening commute, especially if storms line up over the same areas. Low water crossings and underpasses will be the first trouble spots, with the usual rule still very much in play: never try to drive across a flooded roadway. The City of San Antonio offers flood maps and tips on alternate routes if streets are closed. Keeping phones charged, building in extra travel time, and scrapping outdoor plans when storms are nearby are all smart moves.
Severe Threats To Watch
Forecasters are also watching for isolated severe storms, especially west of US 281 and across the Hill Country, where hail and damaging wind gusts are the main concerns. Most of the storm activity is expected to move through by around sunrise or shortly after on Wednesday, May 27, 2026, but any brief, intense downpour could still trigger rapid street flooding. Residents are urged to keep an eye on local forecasts and weather alerts through Wednesday as timing and storm coverage continue to evolve.
