Planning for the weather is a good way to make your trip to Sherrard Island relaxing and enjoyable, especially when you're splurging. 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.