Weather is probably a major factor when you plan your trip to Njombe, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually November and October, with an average temperature of 25°C, while the coldest months are July and June, with an average of 21°C. The rainiest months in Njombe are January, February, March and December, with each month seeing an average of 310 mm of rainfall.