I’m not an expert on Okinawa weather, but I did some research for my past visits and read that tsuyu in Okinawa is a bit different than Honshu tsuyu in that it can be a mix of rain followed by sun on a given day.

However, if you read this (Japanese), the poster is reporting that the tsuyu so far this year in Okinawa has been more like incessant rain most days.
https://detail.chiebukuro.yahoo.co.j...l/q10261710620
A poster posted couple weeks ago that she was there 6 days and on 4 of those days it rained all day long.
So based on that, definitely does not sound like Hawaii.

Tsuyu ends in Okinawa typically in mid-late June.