Planning for the weather is a good way to make your trip to Cahuita relaxing and enjoyable, especially when you’re splurging. The hottest months are usually September and May with an average temp of 79°F, while the coldest months are January and February with an average of 76°F. The rainiest months in Cahuita are July, November, June, and August, with each month seeing an average of 21 inches of rainfall.