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.
In March and December average temperatures are around 17 Â°C (63 Â°F) during the day and 11 Â°C (52 Â°F) at night. The average number of days above 32 Â°C (89.6 Â°F) is 15, most of which occur during July and August.n May and December-the transition months-the average is around 18 Â°C (64 Â°F). In the second half of April, which is the beginning of the summer/holiday season the average sea temperature is 17 Â°C (63 Â°F). The highest sea temperature is 27 Â°C (81 Â°F) in the middle-3rd week of August.