Planning for the weather is a good way to make your trip to Colico relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August with an average temp of 66°F, while the coldest months are January and February with an average of 39°F. The rainiest months in Colico are August, November, May, and October, with each month seeing an average of 8 inches of rainfall.