Visiting local bars in Alphonse Island is better when you know what the weather holds. These temperatures and rainfall averages can help you determine the best time for bar hopping. 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 Alphonse Island are January, December, May, and November, with each month seeing an average of 10 inches of rainfall.