Weather is probably a major factor when you plan your trip to Frances, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and May with an average temp of 79°F, while the coldest months are January and February with an average of 75°F. The rainiest months in Frances are July, November, October, and May, with each month seeing an average of 17 inches of rainfall.