Spotty rain today, very hot Thursday, and more rain chances Friday

Meantime, heavy, tropical rainfall along the coast today

Justin Horne, KSAT Weather Authority Meteorologist

Published: June 16, 2026 at 4:46 AM

FORECAST HIGHLIGHTS

COASTAL FLOODING: Heaviest rain stays relegated to coast, flooding possible
SPOTTY RAIN FOR SA: Isolated downpours today
VERY HOT THURSDAY: Heat index could soar above 110°
MORE RAIN CHANCES: Friday & Saturday

FORECAST

TODAY

An area of low pressure will sweep across South Texas and into the Gulf today. This low could even briefly take on tropical characteristics as it hugs the coast. However, the result is the same: flooding is possible for areas south and east of San Antonio.

In fact, because the low tightens up, rainfall will be limited for San Antonio today. Rain chances sit at just 30% for the city. The farther south and southeast you go, the higher the rain chances and flooding risk.

HEAT KICKS UP

In the wake of this low, stable air will fill in over the area. This will limit clouds and allow temperatures to soar. By Thursday, highs could reach the mid to upper-90s. Meantime, at the surface, we’ll still have humid conditions. That means heat index values could be near 110° on Thursday afternoon!

MORE RAIN CHANCES

By Friday, another front will make a run for South Texas. This could kick up more showers & storms for the area. Rain chances will continue on Saturday and some heavy rainfall will be possible. Rain chances fall again by Sunday.