Planning for the weather is a good way to make your trip to Dumangas relaxing and enjoyable, especially when you're splurging. The hottest months are usually May and April with an average temp of 82°F, while the coldest months are February and January with an average of 79°F. The rainiest months in Dumangas are July, October, September, and June, with each month seeing an average of 13 inches of rainfall.