If you're hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Kayanza: The hottest months are usually August and September, with an average temperature of 19°C, while the coldest months are June and May, with an average of 18°C. The rainiest months in Kayanza are November, April, December and March, with each month seeing an average of 236 mm of rainfall.