Cloudy & Cool Sunday, Widespread Rain Returns Monday

Chilly, damp conditions expected for the Texas Cavaliers River Parade

Apr. 19, 2026 at 11:08am

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A vast, atmospheric landscape painting depicting dark, ominous clouds obscuring the horizon and casting a somber, melancholic mood over a small, isolated structure or landmark in the foreground, dwarfed by the overwhelming power of the natural elements.The looming storm clouds and chilly temperatures set an ominous tone for Fiesta events in San Antonio, as the community braces for a weekend of unpredictable weather.San Antonio Today

A cloudy and cool day is in store for San Antonio on Sunday, with occasional light rain mainly south of the city. More widespread showers are expected on Monday due to an upper-level disturbance, keeping temperatures in the 50s and low 60s. While the rain may taper off in time for the Texas Cavaliers River Parade, damp and chilly conditions are likely. Gradual warming is expected later in the week, though there is a slight storm chance for the Battle of Flowers and Flambeau events.

Why it matters

The changing weather conditions could impact Fiesta events and activities in the San Antonio area, including the popular Texas Cavaliers River Parade. Residents and visitors need to be prepared for the potential of rain, cooler temperatures, and the possibility of storms later in the week.

The details

On Sunday, a few light showers are possible, but the majority of the rain will be south of San Antonio. Temperatures will start in the 50s and top out in the low 60s under mostly cloudy skies. In the evening, the coverage of light rain is expected to increase. Monday will bring another round of off-and-on showers due to an upper-level disturbance, keeping temperatures chilly in the 50s. While the rain may lessen a bit in time for the Texas Cavaliers River Parade, damp and cool conditions are still likely. No severe weather, including thunder and lightning, is expected.

  • On Sunday, occasional light rain is expected, mainly south of San Antonio.
  • On Monday, off-and-on showers are anticipated throughout the day due to an upper-level disturbance.
  • Showers may taper off in time for the Texas Cavaliers River Parade on Monday, but damp and chilly conditions are still likely.
  • Gradual warming is expected later in the week, though there is a slight storm chance for the Battle of Flowers and Flambeau events.

The players

KSAT

The local television news station in San Antonio, Texas, providing weather forecasts and coverage.

Texas Cavaliers River Parade

An annual Fiesta event in San Antonio featuring floats and entertainment on the San Antonio River.

Battle of Flowers

A Fiesta event in San Antonio featuring a parade with floats, marching bands, and other entertainment.

Flambeau

A Fiesta event in San Antonio featuring a nighttime parade with illuminated floats and marching bands.

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What’s next

The latest forecast from KSAT meteorologists will continue to monitor the weather conditions and provide updates on any potential impacts to Fiesta events in the San Antonio area.

The takeaway

The changing weather conditions over the next few days could affect Fiesta events and activities in San Antonio, with the potential for rain, cooler temperatures, and the possibility of storms. Residents and visitors should be prepared to adjust their plans and dress accordingly to enjoy the festivities.