Susie: In september, you can count on some sunshine and some rain, and then some sunshine and some rain, and then some more sunshine and some more rain and then you can count on some sunshine and then some rain.
Actually, September in Belize is much like September in South Florida. If there is any kind of Tropical System in the area you will have quite a bit of rain and if there is not you will have quite a bit of sunshine. Either way it will be great. Go, have fun and enjoy.
Walking in the warm rain in Belize is the greatest.