A Flood Watch has been issued until Wednesday morning for the potential of street flooding
WATCH LIVESTREAM IN VIDEO ABOVEFORECAST HIGHLIGHTS
NOW-8PM: Strong to severe storms west of San Antonio capable of hail, gusty winds.
8PM-2AM: Highest storm chance for San Antonio
RISKS: Primarily street flooding, damaging wind gusts
IMPACTS: Restless sleep, few power outages, snapped branches
ACTIONS: Make sure you have FREE KSAT Weather App
SUNRISE WEDNESDAY: Rain moves east, morning commute may still be affected with low water crossings closed
FORECAST
FLOOD WATCH
A Flood Watch is in effect from 4 pm Tuesday through Wednesday morning due to the risk for street flooding. (Copyright 2026 by KSAT – All rights reserved.)
A Flood Watch is in effect for the counties in green (including San Antonio & Bexar County) until Wednesday morning, as the main risk for storms tonight will be street flooding.
REMEMBER: A “Watch” means we’re simply watching for flooding. If you get a flood “warning” that means street flooding is happening, and you should stay off the roads if possible until the warning expires.
But the timeframe of storms depends on where you live…
TIMING OF STORMS LATER TODAY
For those west of San Antonio, storms have already begun. Any storm that develops will be capable of large hail, damaging gusts, and possibly a tornado. This threat is mainly for those west of San Antonio.
From 8pm on, the storms will form into a line and march east. Any storm that form out of ahead of the line will be capable of large hail, but the main threats will be gusty winds and heavy rain with the line itself.
Those at Spurs outdoor watch parties will want to pay close attention to forecast
Heavy rain will peak around midnight, however, showers and storms could linger through sunrise Wednesday. Street flooding will be a concern and the Wednesday morning commute could be affected.
Future radar for 12am Wednesday (5/27) (Copyright KSAT-12 2026 – All Rights Reserved)
WEDNESDAY
It’ll be cooler and cloudier Wednesday, with only a small 30% chance of redevelopment in the afternoon.
REST OF THE WEEK
It’ll be warmer for the rest of the week, apart from an occasional isolated storm chance.
The latest forecast from Your Weather Authority (Copyright 2026 by KSAT – All rights reserved.)Daily Forecast
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Copyright 2026 by KSAT – All rights reserved.
About the AuthorsJustin Horne headshotJustin Horne
Justin Horne is a meteorologist and reporter for KSAT 12 News. When severe weather rolls through, Justin will hop in the KSAT 12 Storm Chaser to safely bring you the latest weather conditions from across South Texas. On top of delivering an accurate forecast, Justin often reports on one of his favorite topics: Texas history.
Sarah Spivey headshotSarah Spivey
Sarah Spivey is a San Antonio native who grew up watching KSAT. She has been a proud member of the KSAT Weather Authority Team since 2017.
Sarah is a Clark High School and Texas A&M University graduate. She previously worked at KTEN News.
When Sarah is not busy forecasting, she enjoys hanging out with her husband and cat, and playing music.