The Victoria blue salvia, on the other hand, have been blooming their hearts out all summer long and show no signs of stopping anytime soon. Some annuals do keep going after the first light frosts. As far as the first to succumb, surely it will be the impatiens, but they've had a good long and full run this time, much to my surprise -- as long as they're watered faithfully, they can evidentally take a lot of heat.
The lantanas often take their time blooming well and don't really reach their full potential here, but this year they loved the heat advisories and high humidity. That reminded me that they were basically perennials (and almost weeds!) in my mother's garden in Tampa, Florida, years ago. There are so many nice two-tone varieties now -- very cheerful.
There are still some perennials blooming too, although this isn't really a peak time for them. Sedums are undemanding and reliable plants that propagate easily from a single leaf, and they bloom and hold their color well as the nights cool. Here's a nice one: