feedback = you'll get some rain.
Look.. .. . it's a tropical island. Rain is forecast almost all the time. Very often that rain comes in the form of a 10 minute shower. Or a couple of them. August is also hurricane season. You may get more rain if a storm is moving through, but honestly, even though this past year was odd.. .. . NORMALLY the hurricanes don't track as far south as they did this year.
Again, though.. .. . this is a tropical island. Expect rain. PLAY in the rain. You'll have the same forecast generally throughout the caribbean in August. If you're afraid of rain, go to Arizona or something.

(not said in a nasty way) but if you want tropical island paradise.. .. . then expect to get wet occasinally and enjoy it.