San Antonio woke up to light rain, mist and patchy fog on Thursday, May 21, 2026, with temperatures sitting in the low 70s, a muggy start that will not cool much as the day goes on. Showers are expected on and off through the morning, with a better shot at thunderstorms later. The official outlook keeps showers and storms likely through the afternoon, with a high near 84°F, so keep umbrellas close and expect slower commutes on wet streets.
Morning Showers, Afternoon Rumbles
The National Weather Service is calling for showers and thunderstorms likely before 1 p.m. Thursday, May 21, 2026, with a roughly 60% chance of rain and new totals generally between a tenth and a quarter of an inch. Isolated heavier downpours could still lead to brief flooding in low lying spots. Winds should stay light from the east southeast at around 5 mph, and the office notes a low 1 out of 5 severe storm risk well west of the metro where storms could produce hail and damaging gusts. For the full forecast and latest watches, see the National Weather Service Austin/San Antonio.
What To Expect On The Roads
Morning and early afternoon drives could move at a crawl wherever showers roll through. Standing water and sudden downpours will cut visibility and stretch braking distances, so build in extra time if you can. Drivers heading into the Hill Country or the southern Edwards Plateau should be ready for isolated storms that can bubble up quickly. Our look at why this week remains unsettled broke down last night’s activity and why the atmosphere is not calming down just yet. Tie down patio furniture and move outdoor plans inside if radar shows storms closing in.
Weekend And Next Week
The wet pattern is not leaving town for the weekend. Saturday is forecast with a high near 84°F and a 90% chance of showers and thunderstorms, and multiple rounds of storms are likely through Sunday and into next week. Repeated downpours could saturate soils and raise the risk of localized flooding, and officials say watches may be needed if heavier cells track over the same neighborhoods. Check updated forecasts before locking in big outdoor gatherings. Memorial Day on Monday currently looks drier, but there is still a slight chance of showers.
