Annual Weather Averages in Mariehamn
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Mariehamn
High Temp: 69 °F
Low Temp: 23 °F
Mean Temp: 43 °F
Precipitation: 1.85"
Humidity: 83%
Dew Point: 39 °F
Wind: 15 mph
Pressure: 29.88 "Hg
Visibility: 9 mi
January Climate & Weather Averages in Mariehamn
High Temp: 34 °F
Low Temp: 25 °F
Mean Temp: 29 °F
Precipitation: 1.89"
Humidity: 88%
Dew Point: 27 °F
Wind: 17 mph
Pressure: 29.82 "Hg
Visibility: 8 mi
February Climate & Weather Averages in Mariehamn
High Temp: 33 °F
Low Temp: 23 °F
Mean Temp: 28 °F
Precipitation: 1.33"
Humidity: 87%
Dew Point: 25 °F
Wind: 16 mph
Pressure: 29.85 "Hg
Visibility: 8 mi
March Climate & Weather Averages in Mariehamn
High Temp: 37 °F
Low Temp: 26 °F
Mean Temp: 32 °F
Precipitation: 1.18"
Humidity: 82%
Dew Point: 27 °F
Wind: 16 mph
Pressure: 29.87 "Hg
Visibility: 8 mi
April Climate & Weather Averages in Mariehamn
High Temp: 46 °F
Low Temp: 32 °F
Mean Temp: 39 °F
Precipitation: 1.03"
Humidity: 78%
Dew Point: 32 °F
Wind: 15 mph
Pressure: 29.92 "Hg
Visibility: 9 mi
May Climate & Weather Averages in Mariehamn
High Temp: 56 °F
Low Temp: 40 °F
Mean Temp: 48 °F
Precipitation: 1.27"
Humidity: 74%
Dew Point: 39 °F
Wind: 15 mph
Pressure: 29.95 "Hg
Visibility: 11 mi
June Climate & Weather Averages in Mariehamn
High Temp: 64 °F
Low Temp: 48 °F
Mean Temp: 56 °F
Precipitation: 1.85"
Humidity: 76%
Dew Point: 48 °F
Wind: 15 mph
Pressure: 29.89 "Hg
Visibility: 11 mi
July Climate & Weather Averages in Mariehamn
High Temp: 69 °F
Low Temp: 54 °F
Mean Temp: 62 °F
Precipitation: 1.71"
Humidity: 78%
Dew Point: 55 °F
Wind: 14 mph
Pressure: 29.87 "Hg
Visibility: 10 mi
August Climate & Weather Averages in Mariehamn
High Temp: 68 °F
Low Temp: 53 °F
Mean Temp: 60 °F
Precipitation: 2.55"
Humidity: 81%
Dew Point: 55 °F
Wind: 14 mph
Pressure: 29.89 "Hg
Visibility: 10 mi
September Climate & Weather Averages in Mariehamn
High Temp: 60 °F
Low Temp: 46 °F
Mean Temp: 53 °F
Precipitation: 2.20"
Humidity: 84%
Dew Point: 49 °F
Wind: 14 mph
Pressure: 29.94 "Hg
Visibility: 9 mi
October Climate & Weather Averages in Mariehamn
High Temp: 50 °F
Low Temp: 39 °F
Mean Temp: 44 °F
Precipitation: 2.64"
Humidity: 86%
Dew Point: 41 °F
Wind: 16 mph
Pressure: 29.89 "Hg
Visibility: 9 mi
November Climate & Weather Averages in Mariehamn
High Temp: 42 °F
Low Temp: 33 °F
Mean Temp: 37 °F
Precipitation: 2.39"
Humidity: 88%
Dew Point: 35 °F
Wind: 17 mph
Pressure: 29.86 "Hg
Visibility: 8 mi
December Climate & Weather Averages in Mariehamn
High Temp: 37 °F
Low Temp: 28 °F
Mean Temp: 32 °F
Precipitation: 2.23"
Humidity: 89%
Dew Point: 30 °F
Wind: 17 mph
Pressure: 29.80 "Hg
Visibility: 8 mi