Planning for the weather is a good way to make your trip to Viñales relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August with an average temp of 82°F, while the coldest months are January and February with an average of 73°F. The rainiest months in Viñales are June, August, September, and July, with each month seeing an average of 7 inches of rainfall.