September is still very hot. It averaged 90 degrees while we were there, and it has been that way every year. We always go the week of the 21st, it is our anniversary. We live in Memphis, so you know the weather is very similar this time of year in Orlando...I can imagine someone who isn't used to the heat and humidity might find September still unbearable. There were showers most afternoons, but we just put on our ponchos and go on. In fact, the day we rode stuff over and over, it had came a monsoon, and continued to drizzle off and on. IMHO, it was the best day we've ever had at Universal. The pic in my signature was taken that day...we even went to Typhoon Lagoon that morning and had a blast, riding things over and over and over. The rain was our friend!
We are tentatively going to go at the end of February next year, trying to avoid Presidents' weekend, but go before the Spring Breakers start. I think it will be fine...it might be nice to wear jeans or a windsuit and not sweat to beat the band the whole trip. I can live without water rides.