San Antonio weather, explained by a local pattern
San Antonio sits in 'flash flood alley': when spring or fall storms stall over the Hill Country, normally dry creeks turn dangerous in minutes. Summers are long, hot, and mostly rain-free. If a storm chance shows up in your window here, take the percentage seriously — rain in this part of Texas tends to mean business.
How to use this page
The verdict above reads the next 12 hours of official National Weather Service hourly data for central San Antonio and reduces it to one answer. The bar chart underneath shows the precipitation probability hour by hour — taller and bluer means wetter. A quick reading guide: probabilities under 25% are generally safe to plan through, 40% and above during your specific window deserves a plan B, and any active NWS alert (which appears automatically above the chart) outranks everything else on this page.
Conditions can differ across the metro, so for your exact neighborhood — and to check a specific date and time instead of right now — use the ZIP code checker, which also finds your longest dry window of the day. For a deeper read on what these percentages actually mean, see our guide: What does a 40% chance of rain actually mean?