Planning for the weather is a good way to make your trip to Ilhabela Historical Center relaxing and enjoyable, especially when you're splurging. The hottest months are usually February and January with an average temp of 76°F, while the coldest months are July and August with an average of 68°F. The rainiest months in Ilhabela Historical Center are January, February, March, and December, with each month seeing an average of 11 inches of rainfall.