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.
Georgia Weather. St. Marys, GA climate is hot during summer when temperatures tend to be in the 80's and cool during winter when temperatures tend to be in the 50's.he warmest month of the year is July with an average maximum temperature of 89.80 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 44.50 degrees Fahrenheit.