I'm in Tampa and it'll be fairly warm, mid-upper 70's. The weather this morning said we won't be cooling down until MAYBE Wednesday, if at all. There should be some rain on Friday but clearing out for Saturday. I'm sure Orlando will be similar.
I'd bring shorts for the day and jeans/longer pants for the evening (although I think shorts should be OK for the evenings too - but you want at least one pair of longer pants just in case).