Best honeymoon destinations in September ?

Anywhere close to the equator should still be warm then. Trinidad & Tobago, Barbados, Panama... Anywhere in the Carribbean really. We went to Cuba in November and it was amazing. September is the end of the wet season there, though.

Most places should still be warm around that time of the year for your honeymoon. For overall weather, I think there's a bit of a risk for hurricanes and wet weather in most places down that way that time of the year.

However! Our honeymoon is mid-august so we're going to Aruba since it's outside of the hurricane belt and literally always has nice weather