Austin Overnight Lows Expected Between 74°F and 79°F on September 15, 2026
According to ensemble forecast models from the National Weather Service, the overnight low temperatures in Austin, Texas, on September 15, 2026, are expected to range between 74°F and 79°F (23°C to 26°C). This forecast reflects uncertainty in boundary-layer cooling, which is influenced by factors such as cloud cover, humidity, and light wind speeds. Current surface observations indicate typical early-fall conditions in the region, with no significant frontal passages or extreme weather events anticipated. The data for the lowest temperature will be sourced from NOAA's Austin-Bergstrom International Airport Station (KAUS) and will be measured to the nearest whole degree Fahrenheit. If NOAA data is unavailable, Weather Underground's Daily Observations table will serve as a backup source. [Source time: Mon, 14 Sep 2026 01:00:00 GMT]