We just moved from Jacksonville last year, so have a good handle on the climate. It is not completly predictable, as there could be a cold snap. I would bring mostly shorts, sandals are fine too, for the day, but be sure to have at least one sweatshirt, long pants and a light jacket for evenings which can be cool. We were surprised once in Orlando in October and needed sweatshirts at night. Days were still quite warm.