Weather
San Antonio, TX Weather: Flash Flood Risk October 29-30
San Antonio, TX – Portions of South Central Texas face an increasing threat of heavy …
By Jenna Hartley · 2026-10-28T10:40:42.726Z
San Antonio, TX – Portions of South Central Texas face an increasing threat of heavy rainfall and isolated flash flooding Thursday, October 29, into Friday morning, October 30, as tropical moisture moves across the region.
According to the National Weather Service Austin San Antonio office, showers and thunderstorms could produce locally heavy rainfall, particularly across the Rio Grande Plains and southern Edwards Plateau.
Forecasters have identified up to a Level 2 of 4 excessive rainfall risk , indicating a slight risk of flash flooding in the most vulnerable areas.
The greatest concern extends across portions of southwestern Texas near Del Rio, Uvalde, Rocksprings and surrounding communities.
The Weather Prediction Center's excessive rainfall outlook places portions of the Rio Grande region and southern Edwards Plateau within the Level 2 risk area.
Locations farther east, including areas approaching San Antonio, face a lower Level 1 risk in portions of the forecast region.
The primary threat period runs from Thursday, October 29, through Friday morning, October 30.
During this period, tropical moisture could fuel showers and thunderstorms capable of producing heavy downpours.
The National Weather Service warns that isolated flash flooding may develop where rainfall becomes especially intense or repeatedly affects the same location.
Low water crossings, creeks and flood prone roadways could become hazardous if heavy rain develops.
Motorists traveling along U.S. Highway 90, U.S. Highway 83 and other routes across the affected region should remain alert for rapidly changing road conditions.
Drivers should never attempt to cross flooded roadways, even when water appears shallow.
While San Antonio and communities farther east may experience showers and thunderstorms, the highest excessive rainfall risk remains concentrated farther west.
The forecast does not indicate that widespread flooding is certain.
Residents across affected portions of South Central Texas should monitor updated forecasts and any flood advisories or warnings issued as the weather system approaches.
Additional information is available at weather.gov/ewx.