I've found that using a combo of yeast and sourdough starter helps my bread rise in hot humid weather. I also turn my oven light on when I start the dough cycle and by the time the dough is ready to rise in the pan the oven is just warm enough to get a good rise. Then I pull the pan out, bring the oven to temp with a cake pan on bottom rack put bread in oven and pour cold water into cake pan, close oven and set timer.
I ALWAYS get a good oven rise doing it this way, sometimes the bread comes out way to big for sandwich bags and way to big for the toaster...~lol~...
"At The Worlds Beginning There Was A Mother"
~ Chinese Tao Te Ching~