Weather will likely play an important role when you plan your trip to Karoi, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and November, with an average temperature of 23°C, while the coldest months are July and June, with an average of 17°C. The rainiest months in Karoi are January, December, February and November, with each month seeing an average of 197 mm of rainfall.