Planning for the weather is an important factor for making your trip to Kishanganj a success, especially when you're splurging. The hottest months are usually April and May, with an average temperature of 29°C, while the coldest months are January and December, with an average of 21°C. The rainiest months in Kishanganj are July, August, June and September, with each month seeing an average of 466 mm of rainfall.