If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Honiara: The hottest months are usually May and November with an average temp of 80°F, while the coldest months are August and July with an average of 80°F. The rainiest months in Honiara are March, December, January, and February, with each month seeing an average of 17 inches of rainfall.