Okinawa in March? Is it worth? HELP!

Going to Okinawa March 17th-April 2nd and we're worried about one thing: WEATHER! Will the weather be pleasant enough to do outdoor activities? The coast can get cold and we DON'T want to go all the way there just for it to be cloudy, cold and gloomy!

We want to explore the islands, the capes, the beaches, go to the aquarium and more..

Besides Naha, we want to visit Zamami Island, Aka Island and Guerma Island and do a snorkeling tour if we're able. But we don't want to freeze our butts off if we go in the ocean.. Please give me all your wisdom and knowledge arigatouuu! ~