A "cold" front is currently predicted to pass by Saturday and/or Sunday. The temp may plummet from mid-80s to mid-70s (burr!) and start back up toward 80 on Sunday. Right now the wind is predicted to shift from SW to W as the front pass overhead.

Note that I said "may" as our weather predictions are often just a toss of the dice. My rule is to read the prediction and then I tell myself, "You'll know it when you see it."

Here's one more fairly reliable weather site.

St. Pete NOAA weather