Not to worry
We usually spend a lot of time at the beach in august and we seldom have to spend more than a few minutes inside.
Showers, we get, but they are rather quick and refreshing, never that dreary drizzle that seems to hang over the Low Countries and England (or the UK for that matter).
Do bring the following:
Some bug repellent. You are fresh meat for our mosquitos
Lots of Sun Screen-SPF of 30 or better. You are too white, and our sun is too close.
Something for the stomach...just in case. You won't get sick, but just a change in cuisine can cause discomfort.
A great attitude and sense of humor.....
You will have a ball..
HB