Annual Weather Averages in Adak
Adak is 396 miles from Shemya Island, so the actual climate in Shemya Island can vary a bit.
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Shemya Island
High Temp: 56 °F
Low Temp: 28 °F
Mean Temp: 41 °F
Precipitation: 2.75"
Humidity: 80%
Dew Point: 35 °F
Wind: 27 mph
Pressure: 29.75 "Hg
Visibility: 8 mi
January Climate & Weather Averages in Shemya Island
High Temp: 36 °F
Low Temp: 28 °F
Mean Temp: 32 °F
Precipitation: 3.23"
Humidity: 78%
Dew Point: 27 °F
Wind: 30 mph
Pressure: 29.51 "Hg
Visibility: 8 mi
February Climate & Weather Averages in Shemya Island
High Temp: 37 °F
Low Temp: 30 °F
Mean Temp: 33 °F
Precipitation: 3.60"
Humidity: 77%
Dew Point: 27 °F
Wind: 32 mph
Pressure: 29.52 "Hg
Visibility: 8 mi
March Climate & Weather Averages in Shemya Island
High Temp: 38 °F
Low Temp: 31 °F
Mean Temp: 35 °F
Precipitation: 3.03"
Humidity: 78%
Dew Point: 28 °F
Wind: 30 mph
Pressure: 29.76 "Hg
Visibility: 8 mi
April Climate & Weather Averages in Shemya Island
High Temp: 41 °F
Low Temp: 33 °F
Mean Temp: 37 °F
Precipitation: 2.44"
Humidity: 78%
Dew Point: 30 °F
Wind: 29 mph
Pressure: 29.76 "Hg
Visibility: 8 mi
May Climate & Weather Averages in Shemya Island
High Temp: 44 °F
Low Temp: 37 °F
Mean Temp: 41 °F
Precipitation: 2.18"
Humidity: 81%
Dew Point: 35 °F
Wind: 25 mph
Pressure: 29.85 "Hg
Visibility: 8 mi
June Climate & Weather Averages in Shemya Island
High Temp: 49 °F
Low Temp: 42 °F
Mean Temp: 45 °F
Precipitation: 1.52"
Humidity: 83%
Dew Point: 40 °F
Wind: 22 mph
Pressure: 29.88 "Hg
Visibility: 8 mi
July Climate & Weather Averages in Shemya Island
High Temp: 53 °F
Low Temp: 46 °F
Mean Temp: 49 °F
Precipitation: 1.97"
Humidity: 86%
Dew Point: 45 °F
Wind: 21 mph
Pressure: 29.95 "Hg
Visibility: 8 mi
August Climate & Weather Averages in Shemya Island
High Temp: 56 °F
Low Temp: 48 °F
Mean Temp: 52 °F
Precipitation: 2.30"
Humidity: 86%
Dew Point: 47 °F
Wind: 22 mph
Pressure: 29.94 "Hg
Visibility: 8 mi
September Climate & Weather Averages in Shemya Island
High Temp: 53 °F
Low Temp: 45 °F
Mean Temp: 49 °F
Precipitation: 2.65"
Humidity: 82%
Dew Point: 43 °F
Wind: 26 mph
Pressure: 29.85 "Hg
Visibility: 9 mi
October Climate & Weather Averages in Shemya Island
High Temp: 47 °F
Low Temp: 39 °F
Mean Temp: 43 °F
Precipitation: 3.50"
Humidity: 79%
Dew Point: 37 °F
Wind: 29 mph
Pressure: 29.76 "Hg
Visibility: 9 mi
November Climate & Weather Averages in Shemya Island
High Temp: 42 °F
Low Temp: 34 °F
Mean Temp: 38 °F
Precipitation: 3.12"
Humidity: 78%
Dew Point: 32 °F
Wind: 31 mph
Pressure: 29.71 "Hg
Visibility: 8 mi
December Climate & Weather Averages in Shemya Island
High Temp: 38 °F
Low Temp: 30 °F
Mean Temp: 34 °F
Precipitation: 3.51"
Humidity: 79%
Dew Point: 28 °F
Wind: 30 mph
Pressure: 29.50 "Hg
Visibility: 8 mi