If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Kayanza: The hottest months are usually August and September with an average temp of 67°F, while the coldest months are June and May with an average of 64°F. The rainiest months in Kayanza are November, April, December, and March, with each month seeing an average of 9 inches of rainfall.