There's nothing like an all-inclusive holiday in Addis Ababa to refresh you, especially when you know what kind of weather to expect. Here's some information to help you choose when to book: The hottest months are usually March and February, with an average temperature of 17°C, while the coldest months are November and December, with an average of 15°C. December and January are the driest months, while July and August are the rainiest months.