Currently: 68 °F. Mild. (Weather station: Saint Helena Island, Saint Helena). See more current weatherAnnual Weather Averages Near Jamestown
Averages are for Saint Helena Island, which is 4 miles from Jamestown.
Based on weather reports collected during 2012–2021.
All Year Climate & Weather Averages in Jamestown
High Temp: 75 °F
Low Temp: 58 °F
Mean Temp: 65 °F
Precipitation: 1.57"
Humidity: 85%
Dew Point: 60 °F
Wind: 27 mph
Pressure: 30.06 "Hg
Visibility: 16 mi
January Climate & Weather Averages in Jamestown
High Temp: 72 °F
Low Temp: 64 °F
Mean Temp: 68 °F
Precipitation: 1.41"
Humidity: 86%
Dew Point: 63 °F
Wind: 25 mph
Pressure: 30.00 "Hg
Visibility: 17 mi
February Climate & Weather Averages in Jamestown
High Temp: 74 °F
Low Temp: 66 °F
Mean Temp: 70 °F
Precipitation: 1.67"
Humidity: 86%
Dew Point: 65 °F
Wind: 25 mph
Pressure: 29.98 "Hg
Visibility: 20 mi
March Climate & Weather Averages in Jamestown
High Temp: 75 °F
Low Temp: 67 °F
Mean Temp: 71 °F
Precipitation: 1.97"
Humidity: 85%
Dew Point: 66 °F
Wind: 25 mph
Pressure: 29.98 "Hg
Visibility: 19 mi
April Climate & Weather Averages in Jamestown
High Temp: 74 °F
Low Temp: 67 °F
Mean Temp: 70 °F
Precipitation: 1.54"
Humidity: 84%
Dew Point: 64 °F
Wind: 24 mph
Pressure: 30.00 "Hg
Visibility: 19 mi
May Climate & Weather Averages in Jamestown
High Temp: 71 °F
Low Temp: 64 °F
Mean Temp: 67 °F
Precipitation: 1.21"
Humidity: 84%
Dew Point: 62 °F
Wind: 24 mph
Pressure: 30.05 "Hg
Visibility: 20 mi
June Climate & Weather Averages in Jamestown
High Temp: 68 °F
Low Temp: 61 °F
Mean Temp: 64 °F
Precipitation: 2.18"
Humidity: 83%
Dew Point: 59 °F
Wind: 26 mph
Pressure: 30.11 "Hg
Visibility: 17 mi
July Climate & Weather Averages in Jamestown
High Temp: 65 °F
Low Temp: 59 °F
Mean Temp: 62 °F
Precipitation: 2.45"
Humidity: 83%
Dew Point: 57 °F
Wind: 28 mph
Pressure: 30.14 "Hg
Visibility: 16 mi
August Climate & Weather Averages in Jamestown
High Temp: 64 °F
Low Temp: 58 °F
Mean Temp: 61 °F
Precipitation: 2.19"
Humidity: 85%
Dew Point: 56 °F
Wind: 30 mph
Pressure: 30.14 "Hg
Visibility: 13 mi
September Climate & Weather Averages in Jamestown
High Temp: 64 °F
Low Temp: 58 °F
Mean Temp: 61 °F
Precipitation: 1.82"
Humidity: 87%
Dew Point: 56 °F
Wind: 30 mph
Pressure: 30.11 "Hg
Visibility: 12 mi
October Climate & Weather Averages in Jamestown
High Temp: 65 °F
Low Temp: 58 °F
Mean Temp: 62 °F
Precipitation: 1.01"
Humidity: 87%
Dew Point: 57 °F
Wind: 31 mph
Pressure: 30.07 "Hg
Visibility: 12 mi
November Climate & Weather Averages in Jamestown
High Temp: 66 °F
Low Temp: 60 °F
Mean Temp: 63 °F
Precipitation: 0.69"
Humidity: 85%
Dew Point: 57 °F
Wind: 29 mph
Pressure: 30.04 "Hg
Visibility: 14 mi
December Climate & Weather Averages in Jamestown
High Temp: 69 °F
Low Temp: 62 °F
Mean Temp: 65 °F
Precipitation: 0.69"
Humidity: 84%
Dew Point: 59 °F
Wind: 27 mph
Pressure: 30.03 "Hg
Visibility: 18 mi