If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Arua: The hottest months are usually February and January, with an average temperature of 26°C, while the coldest months are August and July, with an average of 22°C. The rainiest months in Arua are October, September, August and July, with each month seeing an average of 236 mm of rainfall.