I got married on August 31st last year and my ceremony was at 7:30 pm (inside the wonderfully air conditioned wedding pavilion). I too live in Florida, Orlando specifically and it was HOT! And I'm used to this weather. I remember it drizzled in the afternoon and you would think that would cool things down, but it actually makes it more humid.
I hope you come to a great decision about this but to be honest, it's super hot. I remember taking pics at the GF before the ceremony and we were all sweating bullets. I had a big dress but my bridesmaids had super light, summery, bridesmaid dresses and they were all very hot too. I mean, you can get lucky but don't expect it to be a nice spring day.
Summer in Orlando is brutal. I think if you're mentally prepared for it and that's what you really want, then you'll be fine. But if you're doubting it now... I don't know.
I sure am happy I chose indoor locations and my wedding was at night.
ps. Just noticed that you said your DF is Filipino. I'm Filipino too.. and compared to the Philippines, it's about the same heat. So if you have a lot of Filipino's there, they'll be used to the weather.