I live in a very windy spot on the coast and find that the bees fly under almost any wind. When it gets above ~25MPH, they do a funny hopping kind of flight, where they fly up to about five feet off the ground, then back down to the ground, perhaps even stopping there for a rest. They repeat this arc until they get where they're going.
My feral bees are happier in the wind than my Italians. Both with fly under just about any wind up to 50MPH, but there will be less Italians coming and going than on a normal day, while the ferals appear to be flying their usual numbers.
I don't know about high heat - I almost never hits 90 here.