Weather will likely play an important role when you plan your trip to Ranchi, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and April, with an average temperature of 30°C, while the coldest months are January and December, with an average of 19°C. The rainiest months in Ranchi are August, July, September and June, with each month seeing an average of 323 mm of rainfall.