Planning for the weather is a good way to make your trip to Acaraú relaxing and enjoyable, especially when you're splurging. The hottest months are usually August and September with an average temp of 81°F, while the coldest months are July and June with an average of 80°F. The rainiest months in Acaraú are April, March, February, and May, with each month seeing an average of 10 inches of rainfall.