Weather San Antonio: forecast and temperatures for Texas tomorrow

Forecast for Sunday, May 25 in San Antonio, Texas

Tomorrow, Sunday, May 25, San Antonio, in South Texas, will experience a warm and humid day, typical of its semi-arid climate. According to the National Weather Service, cloud cover will gradually increase throughout the day.

Temperatures and heat index

The morning low will be around 76°F (24°C), with daytime highs soaring near 96°F (36°C). Heat index values—which combine air temperature and humidity—may rise to 101°F (38°C), making the air feel even warmer and more oppressive, especially in the early afternoon hours.

Sky conditions and rain chances

Skies will be partly sunny, but there is a 20% chance of showers and thunderstorms, particularly after 1 p.m.. Although rain isn’t guaranteed, isolated summer thunderstorms may still develop in the urban and surrounding areas of Bexar County.

Winds and air movement

Expect south-southeast winds ranging from 5 to 10 mph (8 to 16 km/h) in the morning, becoming stronger from the south in the afternoon at 10 to 15 mph (16 to 24 km/h), with gusts possibly reaching up to 25 mph (40 km/h). This wind flow brings humid air from the Gulf of Mexico, contributing to the sticky and sultry atmosphere.

Evening conditions

Overnight, the weather will stay warm and muggy, with patches of cloud cover and a slight chance of showers. Winds will remain light to moderate, maintaining a humid southern flow that prevents any significant cooling.

Local climate context

San Antonio lies in a semi-arid transition zone between the humid subtropical regions to the east and the dry scrublands of West Texas. Its climate features hot summers, mild winters, and infrequent rainfall, especially during late spring and early summer. The incoming pattern for tomorrow fits this climatic identity, offering heat, humidity, and the occasional pop-up thunderstorm.