I gave up on good painting weather here. There is no time when humidity and temp are reliably good for painting. It's why, over time I have ended up using products that are happy in higher temps and not bothered by humidity. I sand and spray outside. The latter only with MTN94. Everything else brushed or wiped indoors. All but the shellac water based.
They don't level as easily other products or spraying. They take longer to cure. But if I am patient and careful...I can pass the 3 foot rule ;-)