There's nothing like an all-inclusive holiday in Mto wa Mbu to revive 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 February and March, with an average temperature of 22°C, while the coldest months are July and June, with an average of 18°C. July and August are the driest months, while April and March are the rainiest months.