San Antonio’s Memorial Day started on the sticky side, with mostly sunny skies sending morning temperatures into the mid 70s and the upper 80s by afternoon. The high should land near 89°F, with light northeast breezes around 0 to 5 mph and dew points close to 70°F, so it will feel plenty muggy. Outdoor plans look safe for today, but a more active and stormy pattern is lining up for the middle of the week.
Midweek Storm Risk
The big change arrives Tuesday, May 26, when showers and thunderstorms become more likely, especially Tuesday evening into the overnight hours. According to the National Weather Service, some storms could produce heavy rain capable of localized flash flooding and slower commutes. The Storm Prediction Center has outlined a Slight Risk for strong to severe storms across parts of the Rio Grande Plains. The strongest cells may bring hail, damaging wind gusts, and rapid street flooding during the Tuesday night and Wednesday morning commute.
Timing And Impacts
Hourly forecasts show only a modest chance for storms Tuesday afternoon, with rain and storm probabilities jumping to around 90 percent Tuesday night and staying elevated into Wednesday morning. Highs should reach about 87°F on Tuesday and near 82°F on Wednesday. The main issues will be heavy downpours that can cause ponding on roads, reduced visibility, and isolated wind or hail damage in the more intense storms. If you need to be on the road late Tuesday or early Wednesday, plan extra travel time and steer clear of low-lying routes.
Plan Ahead
Before the storms move in, keep your phone charged and make sure local weather alerts are turned on. Shift outdoor gatherings away from soggy yards if possible, and secure patio furniture and grills so they do not get tossed around by gusty winds. Never drive through standing water, as it only takes a small amount to stall a vehicle or sweep it off the road. For official watches and warnings, rely on local emergency channels and the National Weather Service.
Late Week Outlook
If the system clears as expected, Thursday and Friday (May 28 to 29) should trend warmer and drier, with highs back in the upper 80s to around 90°F. That will offer a better window for outdoor plans later in the week. Long range details can still change, so check for updated forecasts before locking in weekend events.
