I moved from Portland, OR to Miami, FL nearly 5 years ago now and temperature wise it looks like you're making a very similar transition.
I love it here. I live 15-20 minutes away from the beach (no highway needed), there's no state income tax and it's a melting pot culturally speaking, so i love that.
It's very hot and humid during the summers. Some people say you get used to it, others dont. I've known people that have lived here most of their lives that have said they still arent used to it. I, myself, love going to the beach and wearing shorts and a tee, so it doesnt bother me to melt a little.
Just make sure you have central AC! None of that window AC bs. If you have central, you'll be fine.
Other than that, the food is great since you'll encounter a lot of Caribbean and South American joints to eat at. The women are gorgeous and the beaches are beautiful. The water is actually warm! It amazed me when i first moved here lol. Gas isn't bad, especially right now. The i95 is a madhouse down here though so be ready to see at least 1 accident on there every day; the drivers are notoriously the worst here. Probably one of the biggest drawbacks about FL.
Summertime is also storm/hurricane season, so be prepared for that insurance wise and housing wise; get hurricane/impact windows and renters insurance if you rent. It may seem scary at first (yesterday was the loudest thunderstorm i've heard since i've moved here) but usually its quite beautiful to watch and the rain is kind of relaxing to hear sometimes.... When it's not an actual hurricane.
Other than that, good luck! Hope you enjoy it in FL