If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Gulu: The hottest months are usually February and January, with an average temperature of 26°C, while the coldest months are July and August, with an average of 22°C. The rainiest months in Gulu are April, October, August and May, with each month seeing an average of 222 mm of rainfall.