Weather will likely play an important role when you plan your trip to Umuahia, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and January, with an average temperature of 28°C, while the coldest months are August and July, with an average of 26°C. The rainiest months in Umuahia are September, July, August and October, with each month seeing an average of 391 mm of rainfall.