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Flash Flood Warning Texas: San Antonio watches heavy rain through Friday evening

By Emily Rhodes May 1, 2026

San Antonio stayed under watch Friday as continued monitoring weather conditions and rainfall was expected to keep falling across the area. Rounds of storms could bring heavy rain through Friday evening, and the concern remained focused on what the water could do to roads, low-lying spots and commutes.

said rounds of storms could bring heavy rain through Friday evening, underscoring how quickly conditions could worsen. KSAT crews traveled around the San Antonio area to check road conditions and provide safety tips for viewers, with heavy rainfall identified as the main concern.

Forecasters said many spots could pick up 2 to 4 inches of rain, with isolated totals reaching up to 6 inches by Friday evening. That kind of rainfall is enough to turn nuisance flooding into a much bigger problem in a short time, especially when storms keep moving over the same areas.

The tension is that the heaviest rain was still ahead Friday, not behind the city. KSAT’s on-the-ground checks suggested the risk was not abstract: roads, drainage and driver safety all remained in play as storms continued to build through the day.

By Friday evening, the answer to the question was plain: the warning mattered because the rain had the potential to pile up fast, and San Antonio still had several hours left in the threat window.

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