This is especially true if the heat index is around 105 or higher, which is considered to be dangerous. If you are here when the weather is like this, dress accordingly, drink plenty of water, and do not plan on staying outside for long (nearly all indoor places are air-conditioned) - unless you're taking the opportunity to take a dip in Barton Springs Pool or any of the other swimming holes in the area.

It is not uncommon for daily high temperatures to be between 90 and 100 ☏ (32-38 ☌) during this time - in fact, a day in the 80s is rare, and several days may even reach triple digits (90 days in 2011). However, as Austin lies within Central Texas, be prepared to deal with the long, hot summers if you are visiting between May and September. Austin weather is generally nice most of the year activities are generally not limited by season.