There's nothing like an all-inclusive holiday in Kisumu 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 24°C, while the coldest months are June and July, with an average of 22°C. February and January are the driest months, while April and May are the rainiest months.