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Editor's note: This story was updated at 5:15 p.m. on May 18, 2026.
A cold front is expected to push into the Hill Country and South Texas on Tuesday and then stall over the region, helping to trigger rain all week.
The National Weather Service reports the cold front will combine with a southwesterly flow and existing abundant moisture to create a moderate to strong chance of showers through the weekend and possibly into early next week.
The rain could begin falling on isolated areas of San Antonio on Tuesday afternoon and become more widespread by Wednesday. Most of the city should see rain on Thursday.
The morning and afternoon commutes could become a rainy mess this week, but the afternoon drive home appears more vulnerable to rain due to daytime heating.
Forecasters said the most likely scenario each day this week is for isolated supercells to form in Central Texas before merging into a long line of thunderstorms that move southeast into San Antonio. Meanwhile, some storms could approach the Alamo City from northern Mexico.
The San Antonio area could receive up to two inches on Tuesday alone.
Severe storms are more likely north of a line from Carrizo Springs to Pleasanton to La Grange, including San Antonio. Damaging hail and high winds can't be ruled out.
A rainy April and now May have improved the region's drought, according to the U.S. Drought Monitor. The northern half of Bexar County is now considered to be in moderate drought conditions, while the southern half remains in severe to extreme drought conditions.
The worst drought conditions in the region are along the Bexar-Medina County line and the southern half of Medina County.
