buds is of course correct you need bigger pots. the plant up top is always roughly equivalent to the size of the root ball. if you used bigger pots your plants would be getting bigger still.
high temps slow growth. high temps plus high humidity can cause those yellow spots. humidity is always Relative Humidity. when temps go up humidity should go down, 50% humidity at 72 degrees is perfect, 50% humidity at 85 degrees is terrible
you can rock with 80-100 degree weather if you keep the humidity low as fuck. if the humidity gets above 40% at 100 degrees or higher your plants will steam like collard greens right on their stems. i lost a fan while i was out of town, and when i got back i now have a few yellow spots like that. they will be there till the leaf drops.