Average temperatures, rainfall and packing tips for Austin, United States in September
September in Austin is typically hot, with average daytime highs around 32°C and nights near 22°C. Temperature-wise it sits mid-range for Austin (the 4th warmest month).
September is one of the wetter months in Austin, with around 87 mm of rain - plan around showers.
If your dates are flexible, the most comfortable months in Austin are usually February, March, April, May, November and December.
← Austin weather tomorrow (live)
In September, Austin averages a daytime high of about 32°C and a night-time low of around 22°C, based on recent historical data.
September is one of the wetter months in Austin, with around 87 mm of rain - plan around showers.
September is a workable time to visit Austin, with hot days - just pack accordingly. If your dates are flexible, the most comfortable months in Austin are usually February, March, April, May, November and December.