When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Aberdeen is roughly less than Okinawa. You can assume this to be the case over the next 24 days.
Expect the weather to be around 32 °C on average in July. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Okinawa is generally hotter than in Aberdeen.