Planning for the weather is a good way to make your trip to Karnal relaxing and enjoyable, especially when you’re splurging. The hottest months are usually May and June, with an average temperature of 32°C, while the coldest months are January and December, with an average of 17°C. The rainiest months in Karnal are July, August, September and June, with each month seeing an average of 184 mm of rainfall.