Planning for the weather is a good way to make your trip to Hopa relaxing and enjoyable, especially when you're splurging. The hottest months are usually August and July with an average temp of 72°F, while the coldest months are January and February with an average of 46°F. The rainiest months in Hopa are September, October, August, and July, with each month seeing an average of 10 inches of rainfall.