Weather will likely play an important role when you plan your trip to Bird Island, 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 Bird Island are January, December, May, and November, with each month seeing an average of 10 inches of rainfall.