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A threat for heavy rainfall next week. Here’s what we’re watching

A slow-moving front & deep moisture will combine for rain chances

Rain chances next week (Copyright KSAT-12 2026 - All Rights Reserved)

FORECAST HIGHLIGHTS

  • ISOLATED STORMS THIS AFTERNOON: Best chances in Hill Country
  • STORMS LIKELY BY THURSDAY: We’re watching Wednesday night/Thursday morning
  • HEAVY RAINFALL POSSIBLE: Flooding will be a threat this week

FORECAST

ISOLATED STORMS THIS AFTERNOON

The first half of today will be spent with partly cloudy skies and more warmth. We’ll top out in the mid-90s. By the afternoon, a disturbance moving in from the northwest will help to stir up storms in the Hill Country. The storms may make a run at San Antonio by the evening. Rain chances sit at 20%.

Futurecast for 6pm today (9/27/26) (Copyright KSAT-12 2026 - All Rights Reserved)

RAINFALL NEXT WEEK

While we expect Monday and Tuesday to be relatively quiet, an approaching storm system, deep moisture, and a slow-moving front will combine to give us a threat for heavy rainfall starting late Wednesday. The timing of this event is coming into focus, however, expect changes in the finer details. Here’s the latest:

  • WEDNESDAY: We expect most of the day to be quiet. But, we will be watching what is unfolding to our northwest. A line or cluster of storms may form and work into the South-Central Texas by Wednesday night. Should any storms form Wednesday afternoon, severe weather would be possible, along with flooding.
Forecast for Thursday morning (10/1/26). Heavy rainfall is possible. (Copyright KSAT-12 2026 - All Rights Reserved)
  • THURSDAY: Our best shot at rainfall. Storms are possible Thursday morning and may linger throughout the day, depending on the movement of a slow-moving front. Flooding is a threat. Temperatures will be cooler due to clouds and rainfall.
A flood risk exists late Wednesday through Thursday. (Copyright KSAT-12 2026 - All Rights Reserved)
  • FRIDAY-SUNDAY: It’s possible that rain chances could linger into the weekend. While not as heavy, we’ll continue to watch for any additional flood threat. Otherwise, it will be cooler, with highs staying in the 80s.

Again, specifics will need to be ironed out. We’ll continue to update this forecast often. Please check back.

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

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