Planning for the weather is a good way to make your trip to Nainital relaxing and enjoyable, especially when you’re splurging. The hottest months are usually June and May with an average temp of 71°F, while the coldest months are January and December with an average of 51°F. The rainiest months in Nainital are July, August, September, and June, with each month seeing an average of 23 inches of rainfall.