San Antonio wakes up Saturday, July 11, to that familiar wall of humidity: cloudy skies, temperatures near 79°F, and dew points parked in the low 70s. The heat will build slowly, topping out around 90°F this afternoon with a light southeast breeze. Showers and isolated thunderstorms are on the table, and any quick-hitting downpours could snag the afternoon commute.
Afternoon Storms And Timing
A slight chance of showers hangs on through mid-morning, then scattered storms become more likely from early afternoon into the evening. Winds should stay out of the southeast around 5-10 mph, which means storms will be hit-or-miss: one neighborhood can stay bone dry while the next gets a fast, heavy cell.
Most spots are in line for only a tenth to a quarter of an inch of rain, but any stronger storm could unload a rapid half-inch in a short burst.
Rain Adds Up Through Early Week
Forecasters say repeated daily rain chances into Monday and Tuesday could pile up into locally heavy totals, with some locations picking up more than 3 inches of cumulative rainfall by Tuesday. The Weather Prediction Center has much of the region under a marginal risk for excessive rainfall.
That setup bumps up the odds of brief flash flooding on low-lying roads and in poor-drainage areas if storms slow down or stall. For the full discussion and technical breakdown, see the NWS Austin/San Antonio.
Heat And Where To Cool Off
Even with those pop-up storms, highs will bounce back into the low 90s Sunday and Monday, with heat index readings creeping into the low 100s in some neighborhoods. If the heat gets to be too much, the city maintains a heat resources hub and an interactive map of cooling centers, including libraries, community centers, pools, and splash pads.
You can also call 3-1-1 or the Community Connections Hotline at 210-207-1799 for help finding a spot to cool off. Check the City of San Antonio hot weather page for locations and safety tips.
Plan For The Weekend
If you are tackling outdoor projects or workouts, try to shift the heavy lifting to early morning or later in the evening. Keep water close, build in extra time if roads are wet, and do not be shy about ducking inside during the hottest hours.
A weather app or local radar can be your best friend on a weekend like this, so keep an eye on updates before you head out and while you are on the move.
