If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Honiara: The hottest months are usually May and November, with an average temperature of 27°C, while the coldest months are August and July, with an average of 26°C. The rainiest months in Honiara are March, December, January and February, with each month seeing an average of 424 mm of rainfall.