Planning for the weather is a good way to make your trip to Gilutongan Island relaxing and enjoyable, especially when you’re splurging. The hottest months are usually May and June with an average temp of 83°F, while the coldest months are February and January with an average of 80°F. The rainiest months in Gilutongan Island are July, June, October, and January, with each month seeing an average of 11 inches of rainfall.