Trees have deep roots and can overcome dry conditions pretty easily, unless it is a prolonged drought. Warm and wet conditions mute colors by reducing the production of anthocyanins, which gives the leaves the 'reds'. These are mostly produced in the fall, and is best produced in periods of warm days and cool nights. Additionally, the cool nights slow the pace at which sugar sap can flowing from the leaf veins back down into the branches and trunk. We got nothing but severe warmth at nights during Sep and early Oct. That disgusting eastern ridge and tropical humidity that plagued us for 6 weeks has probably ruined our foliage season.
*ETA: "ruined" might be harsh. We have entered into a near-perfect weather pattern, so maybe we throw an end-of-game 'hail Mary' and save the season. I can notice definite changes the last several days, though I yet to see vibrant colors. I can't recall a fall I would describe as disappointing in all my years, so maybe we are just delayed and not denied.