Planning for the weather is a good way to make your trip to Engelberg relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August with an average temp of 55°F, while the coldest months are January and February with an average of 26°F. The rainiest months in Engelberg are June, July, August, and May, with each month seeing an average of 9 inches of rainfall.