If you're looking forward to lots of outings with your partner, check out these details about year-round temperatures in L'Ermitage-les-Bains: The hottest months are usually February and January with an average temp of 77°F, while the coldest months are August and July with an average of 69°F. The rainiest months in L'Ermitage-les-Bains are January, February, March, and December, with each month seeing an average of 10 inches of rainfall.