Is the beach water warm?

I know it’s a profoundly stupid question and I’m totally open to snarky and sarcastic replies but seriously, I haven’t been to the beach in years due to a long battle with illness but I’m craving a few reparative hours in the ocean by myself. The water is already warm right?

Also where should I go? Mid-week, and I live in Coconut Grove. Is Crandon Park still nice?