Weather is probably a major factor when you plan your trip to Sherrard Island, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and November, with an average temperature of 28°C, while the coldest months are August and July, with an average of 25°C. The rainiest months in Sherrard Island are January, February, March and December, with each month seeing an average of 360 inches of rainfall.