I was there last year at the exact same time. It was very hot and humid with thunderstorms every afternoon. We had just returned from Mexico and my friend stated that she thought that it was more humid in Orlando that it was in Mexico. It was crowded for us, we usually go at very slow times of the year. The wait was about 1 hour or more on popular rides. We would use FP or ride rides such as Tot or RnR near closing time and had a very short wait. The storms seemed longer than the typical Florida afternoon thunderstorm, many people would go back to the resorts. If you can stick it out, the parks were almost empty for about an hour after the storms.