How long we think this streak of triple-digit heat will last

Temperatures to rise above 100° again today

Justin Horne, KSAT Weather Authority Meteorologist

Published: August 19, 2026 at 5:13 AMUpdated: August 19, 2026 at 5:43 AM

FORECAST HIGHLIGHTS

NO RECORDS, BUT ABOVE AVERAGE: 100°-102° will be the norm
HOW LONG?: Triple digits will hold through at least next week
EL NINO UPDATE: ‘Very strong’ El Nino this winter almost a certainty

FORECAST

SAME SONG, SECOND VERSE

The last two days have given highs at 100°. Today will be no different, with some places a degree or two warmer. It’s possible that temperatures may even climb to around 102° in San Antonio by the weekend. It’ll be steadily hot into next week.

HOW LONG IS THIS GOING TO LAST?

This hot streak shows few signs of letting up. As of now, triple digits appear to be a good bet through the end of next week. If you look long-range, there are some indications that the heat high may weaken a bit by the end of the month. Unfortunately, this far out, there’s no guarantee that’ll be the case. We’ll keep you posted.

‘VERY STRONG’ EL NINO IS LIKELY

Farther down the line, we do expect El Nino to have impacts on South Texas this winter. The odds of a ‘very strong’ El Nino have now increased to more than 90%. El Nino winters typically bring a more active pattern to the area.