Currently: 79 °F. Passing clouds. (Weather station: Owen Roberts Airportgrand Cayman, Cayman Islands). See more current weather
Annual Weather Averages in Owen Roberts Airportgrand Cayman
Owen Roberts Airportgrand Cayman is 106 miles from Sister Island, so the actual climate in Sister Island can vary a bit.
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Sister Island
High Temp: 90 °F
Low Temp: 73 °F
Mean Temp: 82 °F
Precipitation: 2.81"
Humidity: 78%
Dew Point: 75 °F
Wind: 18 mph
Pressure: 29.96 "Hg
Visibility: 7 mi
January Climate & Weather Averages in Sister Island
High Temp: 84 °F
Low Temp: 73 °F
Mean Temp: 78 °F
Precipitation: 1.26"
Humidity: 78%
Dew Point: 71 °F
Wind: 20 mph
Pressure: 30.02 "Hg
Visibility: 7 mi
February Climate & Weather Averages in Sister Island
High Temp: 84 °F
Low Temp: 73 °F
Mean Temp: 79 °F
Precipitation: 0.72"
Humidity: 77%
Dew Point: 72 °F
Wind: 20 mph
Pressure: 30.02 "Hg
Visibility: 7 mi
March Climate & Weather Averages in Sister Island
High Temp: 85 °F
Low Temp: 73 °F
Mean Temp: 79 °F
Precipitation: 0.64"
Humidity: 76%
Dew Point: 72 °F
Wind: 20 mph
Pressure: 30.00 "Hg
Visibility: 7 mi
April Climate & Weather Averages in Sister Island
High Temp: 87 °F
Low Temp: 75 °F
Mean Temp: 81 °F
Precipitation: 0.86"
Humidity: 76%
Dew Point: 74 °F
Wind: 19 mph
Pressure: 29.96 "Hg
Visibility: 7 mi
May Climate & Weather Averages in Sister Island
High Temp: 88 °F
Low Temp: 77 °F
Mean Temp: 83 °F
Precipitation: 3.14"
Humidity: 77%
Dew Point: 76 °F
Wind: 18 mph
Pressure: 29.94 "Hg
Visibility: 7 mi
June Climate & Weather Averages in Sister Island
High Temp: 89 °F
Low Temp: 78 °F
Mean Temp: 84 °F
Precipitation: 4.12"
Humidity: 78%
Dew Point: 77 °F
Wind: 19 mph
Pressure: 29.96 "Hg
Visibility: 7 mi
July Climate & Weather Averages in Sister Island
High Temp: 90 °F
Low Temp: 78 °F
Mean Temp: 84 °F
Precipitation: 3.47"
Humidity: 77%
Dew Point: 78 °F
Wind: 18 mph
Pressure: 29.99 "Hg
Visibility: 7 mi
August Climate & Weather Averages in Sister Island
High Temp: 90 °F
Low Temp: 79 °F
Mean Temp: 85 °F
Precipitation: 3.55"
Humidity: 78%
Dew Point: 78 °F
Wind: 16 mph
Pressure: 29.95 "Hg
Visibility: 7 mi
September Climate & Weather Averages in Sister Island
High Temp: 90 °F
Low Temp: 78 °F
Mean Temp: 84 °F
Precipitation: 4.48"
Humidity: 79%
Dew Point: 78 °F
Wind: 14 mph
Pressure: 29.90 "Hg
Visibility: 7 mi
October Climate & Weather Averages in Sister Island
High Temp: 89 °F
Low Temp: 77 °F
Mean Temp: 83 °F
Precipitation: 5.94"
Humidity: 80%
Dew Point: 77 °F
Wind: 17 mph
Pressure: 29.89 "Hg
Visibility: 7 mi
November Climate & Weather Averages in Sister Island
High Temp: 86 °F
Low Temp: 76 °F
Mean Temp: 81 °F
Precipitation: 3.68"
Humidity: 79%
Dew Point: 74 °F
Wind: 20 mph
Pressure: 29.94 "Hg
Visibility: 7 mi
December Climate & Weather Averages in Sister Island
High Temp: 85 °F
Low Temp: 74 °F
Mean Temp: 80 °F
Precipitation: 1.82"
Humidity: 78%
Dew Point: 73 °F
Wind: 20 mph
Pressure: 29.99 "Hg
Visibility: 7 mi