San Antonio, Texas – South-Central Texas is baking under triple-digit heat, but a major shift in weather is on the horizon, with flash flooding possible from Sunday night through Monday as tropical moisture surges into the region.
According to the National Weather Service in Austin-San Antonio, a Level 1 to 2 risk for excessive rainfall is in effect across much of the Hill Country and western South-Central Texas. The highest flash flood potential spans from Del Rio and Eagle Pass through Uvalde and Rocksprings. Rain chances for these areas exceed 60% by Sunday, with the window of concern continuing into early Monday.
San Antonio, Austin, and New Braunfels are expected to see increasing rain chances—up to 60% by Sunday—as highs drop into the upper 80s. While the threat for flooding is lower in the I-35 corridor, brief heavy downpours could still cause minor roadway ponding, especially in urban and low-lying areas.
Drivers in high-risk zones should avoid flooded roadways and monitor local alerts. Residents are advised to prepare now by clearing drains and staying weather-aware.
Uncertainty remains in exact rainfall totals and locations, but forecasters stress conditions are ripe for locally heavy rain. Additional advisories are likely as confidence in the setup grows.
Five-Day Forecast for San Antonio, TX:
- Thursday: Hot and dry, high of 102°F
- Friday: Sunny, high of 101°F
- Saturday: Isolated showers late, high of 95°F, rain chance 25%
- Sunday: Scattered storms, high of 87°F, rain chance 60%
- Monday: Showers likely, high of 90°F, rain chance 50%
