An amount below 100 means Dayton, Ohio is cheaper than the US average. A cost of living index above 100 means Dayton, Ohio is more expensive.
Sea Island, GA Weather. The average temperature of Sea Island is 67.50Â°F, which is much higher than the Georgia average temperature of 62.30Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather.
All Mackinac Island lovers believe the summer months in northern Michigan and the Island are ideal. The average summer temperature on Mackinac Island is between 75Â°F and 79Â°F. Itâs always smart to wear layers or put a sweatshirt or jacket in a small backpack in case the weather changes.