Weather is probably a major factor when you plan your trip to Munroe Island, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April, with an average temperature of 29°C, while the coldest months are January and February, with an average of 27°C. The rainiest months in Munroe Island are August, July, June and September, with each month seeing an average of 286 mm of rainfall.