Austin starts Wednesday, August 19, with clear skies and temperatures around 80 degrees, but the day is headed for a much harsher finish. The high is expected to reach 103 degrees, with a heat index as high as 108, and there is no meaningful chance of rain to break up the heat.
Triple-Digit Heat Builds Through The Weekend
The National Weather Service expects Thursday to be even hotter, with a high near 104 degrees and heat-index values up to 109. Overnight temperatures will remain stubbornly warm, dipping only to about 79 or 80 degrees and offering limited relief after sunset.
Friday and Saturday are forecast to reach 104 and 105 degrees, respectively, followed by another 105-degree afternoon Sunday. Monday should still hit 104, with Tuesday easing slightly to around 103, while rain chances remain near zero throughout the stretch.
Light Winds Will Not Do Much To Help
South to southwest winds around 5 mph are expected Wednesday, increasing to 5 to 10 mph Wednesday night with possible gusts near 20 mph. Winds turn lighter again Friday through Sunday, generally staying between calm and 5 mph, so outdoor areas may feel especially stagnant during the hottest part of the day.
Heat Headlines Could Arrive Later This Week
No watch, warning or advisory is listed for Austin Wednesday morning, but forecasters say heat-related headlines could become necessary as early as Friday. The combination of afternoon temperatures above 100 degrees and warm overnight lows will keep heat stress elevated even for people accustomed to Central Texas summers.
Anyone spending time outside should move strenuous activities to the morning or evening, drink water regularly and take frequent breaks in shade or air conditioning. Check on older neighbors, young children and pets, and never leave anyone in a parked vehicle—even for a quick errand.
