If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Engelberg: The hottest months are usually July and August, with an average temperature of 13°C, while the coldest months are January and February, with an average of -3°C. The rainiest months in Engelberg are June, July, August and May, with each month seeing an average of 222 mm of rainfall.