Trip to zamami in July

Hi I'm planing my Japan trip in July and have two nights free between my stay in Tokyo to Osaka. And I'll love to visit zamami, can someone help me out finding out the logistics to make that happened, around which hour to bock our flight to arrive in Naha? At Wich our the ferry leaves? (We need to be able to catch the ferry after the flight). And the other way, taking the ferry back to Naha and booking a flight to Osaka
How's the weather in July? (Outside of hot hahahaha)