Years ago I occasionally grew Thunbergia alata, the black-eyed Susan vine or clock vine. It's a reliable hot weather vine that slowly climbs to about four feet high. It's reliable in the senses that it grows without trouble and eventually blooms freely, but it's too short to be used as most vines are.
Now fast forward a few decades. The modern black-eyed Susan vines have the potential to put on a real show. The one I grew this year, 'Sunny Orange Wonder', grew freely throughout the summer and bloomed now and then. But it wasn't until things began to cool off a bit that it started to bloom freely. No doubt it will be at its best just before the first good freeze.