San Antonio is currently experiencing its driest period of 2026, marking 22 straight days without measurable precipitation as of mid-August. While this dry spell represents the city’s longest since November 2025, it remains far below the historical record of 63 consecutive rainless days set in 1993.

Despite the recent drought conditions, San Antonio’s cumulative rainfall for 2026 stands at 24.79 inches—roughly 30% above the historical average for this point in the year.

Persistent high pressure over Texas will keep rain chances near zero for most of the upcoming week while driving up regional temperatures.

Triple-Digit Heat Dominates the Workweek

• Early Week: Temperatures will hover in the upper 90s through Monday before hitting the 100-degree mark on Tuesday, accompanied by heat index values reaching 105 degrees.
• Peak Heat (Wednesday–Friday): Highs will climb to 101–102 degrees across South Texas. Elevated humidity will push heat indices close to 107 degrees.
• Midweek Rain Chances: Precipitation chances remain negligible across South Texas, with only an isolated 20% risk of pop-up storms in the Hill Country and Central Texas on Friday.

When Rain Could Return

A potential pattern shift may emerge by next weekend as long-range models indicate the high-pressure ridge could migrate westward. This movement could generate isolated showers and thunderstorms across the San Antonio metro area, though weekend rain chances remain low at around 20% due to model divergence.

Substantial, widespread relief is not anticipated until early September, when long-range ECMWF ensemble projections indicate regional precipitation levels will finally rebound toward seasonal averages.