Heavy rainfall possible later today through Thursday, flooding a concern

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FORECAST HIGHLIGHTS

FORECAST

Get ready, South Texas! An active weather pattern is rolling in, bringing with it the potential for heavy rainfall and a risk of flooding. With disturbances in the atmosphere, a boundary in place, and plenty of moisture, the stage is set for some significant weather changes.

WHEN: Expect to see this weather pattern developing from Monday afternoon through Thursday.

WHAT TO WATCH FOR: Be cautious of potential street flooding, especially in urban areas, as river and creek flooding may also occur, particularly west of San Antonio. If you’re in these regions, keep your phone alerts on and stay aware of the weather updates.

HOW MUCH RAINFALL?: Over the next four days, many areas could see between 1-3 inches of rain, but some locations near the Rio Grande might receive over 6 inches. So, it’s important to stay informed!

TODAY: Showers and storms are already popping up near Del Rio this morning. Expect more to develop as the day heats up. In San Antonio, the best chances for rain will come late this afternoon into tonight, with heavy rain possible in some areas.

In this type of weather pattern, pinpointing where the heaviest rainfall will hit is tricky, so be prepared for flash flooding overnight. The Tuesday morning commute may also be impacted.

Future radar for 5pm Monday afternoon.
(Copyright KSAT-12 2026 – All Rights Reserved)

TUESDAY: Heavy rain is expected to continue into Tuesday, though there may be brief breaks during the day. It won’t be pouring all day, with a 60% chance of rain. However, isolated flooding remains a concern.

Flash Flood risk for Tuesday. On a scale of 1-4, those west of San Antonio sit at “3” risk.
(Copyright KSAT-12 2026 – All Rights Reserved)

WEDNESDAY & THURSDAY: The heavy rain continues into Wednesday and Thursday, with the focus shifting west towards the Rio Grande. Rainfall totals could reach up to 5 inches in many areas, with some isolated spots potentially seeing up to 8 inches, particularly around the Rio Grande and Edwards Plateau. River flooding will be closely monitored, so those near the Frio, Nueces, or Rio Grande should stay alert to the forecast.

Extended Forecast
(Copyright KSAT-12 2026 – All Rights Reserved)

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