The temperature oh Oahu, is actually pretty moderate for a tropical location. Because of the trade winds there is almost always a breeze keeping in warm but not that hot around 75-80 degrees F (25ish C) If you are there for a week I would expect a couple cooler cloudy days maybe with some rain in the morning. But you can always do the siteseeing, souvineer shopping, and other things then. And then as soon as it warms up head out to the beach! In the current 10 day forcast there is only 1 day that is expected to be scattered showers.
check it out if you want.
Hope you have a great trip!
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