San Antonio Weather Forecast: Severe Storm Threat, Heat Index Spike & Hour-by-Hour Updates for Today

South Texans woke up to rumbling skies again this morning, and the unsettled pattern that flipped the script on May’s drought is not done yet. According to the National Weather Service in Austin/San Antonio, a Severe Thunderstorm Watch remains in effect along the Rio Grande through 8 a.m., with quarter-size hail and 60 mph wind gusts the main hazards. What to expect today • Morning commute: Scattered storms lingering from the overnight line will keep rain chances near 50 percent across Bexar County through 10 a.m. Isolated pockets of street flooding are possible—slow down on wet roadways. • Midday break: A few hours of sunshine should nudge highs into the mid- to upper-80s, but humidity will make it feel closer to 95 degrees. • Afternoon reload: Daytime heating will re-ignite storms after 3 p.m. Coverage is projected around 40 percent, and the Storm Prediction Center places San Antonio in a Level 1 (marginal) risk for severe weather—meaning a rogue cell could still drop hail or knock out power lines with strong wind bursts. Why the pattern flipped A slow-moving upper-level trough parked over the Southwest is tapping Gulf moisture, steering one disturbance after another across the Hill Country. The same setup delivered more than two inches of much-needed rain Monday night—San Antonio’s wettest calendar day since January 2024. While the Edwards Aquifer remains under Stage 5 pumping restrictions, repeated downpours are chipping away at extreme drought conditions. Outlook through the weekend • Thursday: Storm coverage eases to 30 percent; morning lows near 72 °F climb to 88 °F by late day. • Friday: A weak cold front slides in, trimming highs to the mid-80s and bringing a 20 percent chance of showers at sunrise. • Saturday–Sunday: Briefly cooler dawns in the upper-60s give way to hotter, sunnier afternoons—highs rebound to the low 90s by Sunday. Safety reminders 1. Turn Around, Don’t Drown on flooded low crossings. 2. Secure patio furniture ahead of evening storms. 3. Download NOAA Weather Radio alerts or enable Wireless Emergency Alerts on your phone. Bottom line Keep the umbrella and a backup plan handy—San Antonio weather stays storm-prone through mid-week before drier, hotter air returns for the first days of June.