Weather is probably a major factor when you plan your trip to Jammu, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually June and May, with an average temperature of 31°C, while the coldest months are January and December, with an average of 15°C. The rainiest months in Jammu are July, August, September and June, with each month seeing an average of 204 mm of rainfall.