I have been to the island about every month except January and November and Just went in mid-August last year. Not every place will be open but most should be. It was not crowded at all and I found it to be extremely warm and humid. I would go back again though without hesitation. Not sure where you would be staying but if on the Dutch side, I would want a place that has a back-up generator in case GEBE is still having issues. The place I stayed at did have a generator and it came in very handy to keep the a/c and electric on.
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