If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Old Manali: The hottest months are usually June and May with an average temp of 82°F, while the coldest months are January and December with an average of 57°F. The rainiest months in Old Manali are July, August, September, and January, with each month seeing an average of 8 inches of rainfall.