This past summer was my first DW trip that was not in July. Instead I decided to go the last week of August and 1st week of Sep. Huge difference. We only had 3 days that were over 90 degrees this trip, where as on my July trips I would say 90% of the days have been 90+, even a few near 100. I also noticed the night time temps being about 3-5 degrees cooler than what I've experienced on most of my July trips.
I attached a quick spreadsheet I made using weather data for the past 10 years in Orlando for both the last week of July and last week of August to showcase the difference. Last week of August generally looks to be about 2-4 degrees cooler in the day and about 2 degrees cooler for the lows. The mean avg is also about 2 degrees cooler in August than in July for that last week. Now precipitation-wise, August definitely appears to be a lot more rainy. Almost a quarter of an inch more per day avg than in July. While compiling the data, I noticed there were days in July that got as high as 98 and 95-97 degree days were not uncommon in July. Likewise, there were a few lows that were 81-83 and 78-79 was not uncommon in July. But August never saw any highs go above 96 (and 96 was rare) and never had a night go over 78.
By the way, I realize this thread is old now, but figured someone could always use the data.
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