The weather is typical for September at WDW (humid, equally divided between "thunderclouds" and "stupidly sunny", frequent 30-minute rainshowers throughout the day), but we like coming down here this time of year even with the intermittent showers because at least the showers usually clear out the parks some ("it's raining! oh no! we have to go back to the hotel before we get wet!") and because it's also the time of year for the Food & Wine Festival. :)
Sarah and I love it here -- we come every year when we can.