Weather is probably a major factor when you plan your trip to Beau Vallon, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and May with an average temp of 83°F, while the coldest months are July and August with an average of 80°F. The rainiest months in Beau Vallon are January, December, May, and November, with each month seeing an average of 10 inches of rainfall.