If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Lenzerheide: The hottest months are usually July and August, with an average temperature of 11°C, while the coldest months are January and February, with an average of -6°C. The rainiest months in Lenzerheide are August, June, May and July, with each month seeing an average of 205 mm of rainfall.