Planning for the weather is an important factor for making your trip to Tres Ríos a success, especially when you’re splurging. The hottest months are usually March and February with an average temp of 69°F, while the coldest months are January and February with an average of 68°F. The rainiest months in Tres Ríos are October, August, November, and July, with each month seeing an average of 41 inches of rainfall.