San Antonio, Texas, August 16, 2025
News Summary
Tropical moisture has entered South Texas, raising the likelihood of scattered downpours across San Antonio this weekend. Rainfall could reach 1 to 2 inches, with some isolated locations receiving up to 5 inches. The National Weather Service has issued a Flood Watch for several counties, emphasizing precautions for sudden downpours. Residents should prepare for significant rainfall starting early Saturday morning, with triple-digit heat returning on Sunday and into the following week.
San Antonio, Texas – Tropical moisture has moved into South Texas, resulting in a significant increase in the likelihood of scattered downpours this weekend. Rainfall amounts in some areas are projected to reach between 1 and 2 inches, sparking concerns over potential localized flooding. The National Weather Service has issued a Flood Watch for Real, Uvalde, Kerr, Bandera, and Medina counties, which will remain in effect until Saturday at 7 p.m.
The weather service has expressed an “increasing confidence” regarding a small-scale heavy rain event, indicating that widespread rainfall ranging from 1 to 2 inches is likely, with certain isolated locations possibly receiving between 3 to 5 inches. Rainfall may begin impacting the area as early as 3 a.m. Saturday morning, according to forecasts.
Current radar data shows new weather convection is developing in regions northwest of Corpus Christi, advancing towards San Antonio and its surrounding areas. Forecast models are predicting that by Saturday morning, the Uvalde and Medina counties could accumulate over 4 inches of rainfall.
Many regions across San Antonio, inclusive of the Hill Country and communities along the I-35 corridor, have been assigned a Level 1 out of 4 risk classification for excessive rainfall on Saturday, mostly between midnight and 8 p.m. This situation emphasizes the urgency for residents to be cautious and prepared for sudden downpours.
In terms of temperatures, Friday night is expected to see a low of around 78 degrees with a 30% chance of showers and thunderstorms, accompanied by wind gusts reaching up to 20 mph. Moving into Saturday, the temperature will exhibit a low of 78 degrees and a high of 97 degrees, with rain showers and thunderstorms anticipated to commence after 4 p.m. The conditions will generally be mostly sunny, with a 40% chance of precipitation.
Looking ahead, Sunday will bring a return to triple-digit heat, with a low of 78 degrees and a high forecasted at 100 degrees under mostly sunny skies. The conditions will remain warm into the following week, with Monday predicting a low of 77 degrees and a high of 100 degrees, followed by Tuesday exhibiting a low of 78 degrees, a high near 99 degrees, and a 20% chance of afternoon showers and storms.
This weather event is subject to rapid changes; as conditions evolve, further updates will be provided to keep the public informed and safe.
Weather Overview
| Day | Low (°F) | High (°F) | Chance of Rain |
|---|---|---|---|
| Friday Night | 78 | 30% | |
| Saturday | 78 | 97 | 40% |
| Sunday | 78 | 100 | |
| Monday | 77 | 100 | |
| Tuesday | 78 | 99 | 20% |
Frequently Asked Questions
What is a Flood Watch, and who is affected?
A Flood Watch is a notification issued by the National Weather Service indicating that flood conditions are possible in the specified area. Residents in Real, Uvalde, Kerr, Bandera, and Medina counties are primarily affected by this watch.
How much rainfall is expected in San Antonio this weekend?
San Antonio is expected to see rainfall amounts of 1 to 2 inches, with the possibility of isolated areas receiving up to 3 to 5 inches.
When will the rain begin?
Rain could begin affecting the area as early as 3 a.m. on Saturday.
What are the expected temperatures?
Temperatures are expected to range from a low of 78 degrees to a high of 97 degrees on Saturday, with triple-digit heat returning on Sunday.
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Additional Resources
- KENS5
- Wikipedia: Weather
- Express News
- Google Search: San Antonio Weather
- The Weather Channel
- Google Scholar: Climate in San Antonio
- Express News
- Encyclopedia Britannica: Tropical storms
- The Weather Channel
- Google News: San Antonio Forecast
Author: STAFF HERE SAN ANTONIO WRITER
The SAN ANTONIO STAFF WRITER represents the experienced team at HERESanAntonio.com, your go-to source for actionable local news and information in San Antonio, Bexar County, and beyond. Specializing in "news you can use," we cover essential topics like product reviews for personal and business needs, local business directories, politics, real estate trends, neighborhood insights, and state news affecting the area—with deep expertise drawn from years of dedicated reporting and strong community input, including local press releases and business updates. We deliver top reporting on high-value events such as Fiesta San Antonio, San Antonio Stock Show & Rodeo, and Dia de los Muertos. Our coverage extends to key organizations like the Greater San Antonio Chamber of Commerce and United Way of San Antonio and Bexar County, plus leading businesses in retail, insurance, and energy that power the local economy such as H-E-B, USAA, and Valero Energy. As part of the broader HERE network, including HEREAustinTX.com, HERECollegeStation.com, HEREDallas.com, and HEREHouston.com, we provide comprehensive, credible insights into Texas's dynamic landscape.
