okinawa travels in june

hiii! I’m looking for advice on traveling to Okinawa in June.

I’m planning a longer trip, probably at least 2 weeks, though the exact length isn’t confirmed yet. I’m thinking of visiting just a few places in Okinawa rather than trying to cover too much, and I’m not sure whether it’s better to stay in the city area first or head straight to smaller towns and base myself there.

How is the weather in June? From what I’ve read, it seems like it’s the rainy season, so I’m wondering how disruptive that usually is for travel. Is it still manageable for sightseeing and beach activities, or should I expect a lot of indoor time?

I’d also love recommendations on where to stay and what to do, especially for a slower-paced trip. Since I’ll have a couple of weeks, I’m open to staying in one or two bases instead of moving around too much.

side note, im looking to dive in okinawa, any must go spots? or better areas to stay closer to the diving spots?

Lastly, I’m trying to figure out the budget. If I stay for around 3 weeks, would SGD 2,500 be enough for accommodation, food, local transport, and activities, excluding flights?

Any advice would be really appreciated!