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Saint Helena Island, SC Weather

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The average temperature of Saint Helena Island is 65.51°F, which is higher than the South Carolina average temperature of 61.70°F and is much higher than the national average temperature of 54.45°F.

Topics:Heating Cost IndexCooling Cost IndexHistorical TemperatureHistorical PrecipitationHistorical SnowHistorical HumidityHistorical Wind Speed

Historical Weather

Heating Cost Index, #6

Saint Helena Island, SC
South Carolina

Cooling Cost Index, #341

Saint Helena Island, SC
South Carolina

The Heating Cost Index and the Cooling Cost Index are indicators of the relative heating and cooling cost of an area. They were calculated based on the average temperate and duration of the hot and cold days for the area. Please note, the actual heating cost and cooling cost are also dependent on other factors specific to individual residences such as the size of the house, the insulation condition, and the equipment efficiency, etc.

Average Temperature

Annual Average Temperature, #16
Saint Helena Island, SC
65.5 °F
South Carolina
61.7 °F
54.5 °F

Ranks: Average Max. Temperature: #77, Average Min. Temperature: #5


Average Annual Precipitation, #107
Saint Helena Island, SC
50.36 inches
South Carolina
49.24 inches
38.67 inches

Average Number of Days with 0.1 Inch or More Precipitation in a Year (this gives an indication of the number of days in a year that it is useful to have an umbrella), #116
Saint Helena Island, SC
73.44 days
South Carolina
72.92 days
66.51 days


Average Annual Snowfall, #456
Saint Helena Island, SC
0.24 inches
South Carolina
1.50 inches
23.27 inches

Average Number of Days with 1 Inch or More Snow Depth in a Year, #445
Saint Helena Island, SC
0.05 days
South Carolina
0.62 days
27.17 days


Annual Average Humidity, #31
Saint Helena Island, SC
South Carolina

Wind Speed

Annual Average Wind Speed, #251
Saint Helena Island, SC
15.76 mph
South Carolina
15.88 mph
16.93 mph

* The temperature, snow fall, and precipitation information on this page were calculated from the historical data of 18,000+ U.S weather stations for the period of time from 1980 to 2010. The humidity and wind speed information were calculated from data from 15,000 worldwide stations for the period of time from 1980 to 2010.

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