If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Tsumeb: The hottest months are usually October and November, with an average temperature of 25°C, while the coldest months are July and June, with an average of 17°C. The rainiest months in Tsumeb are January, February, December and March, with each month seeing an average of 176 mm of rainfall.