Annual Weather Averages in Sion
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Sion
High Temp: 81 °F
Low Temp: 27 °F
Mean Temp: 52 °F
Precipitation: 1.97"
Humidity: 67%
Dew Point: 40 °F
Wind: 9 mph
Pressure: 30.05 "Hg
Visibility: 8 mi
January Climate & Weather Averages in Sion
High Temp: 41 °F
Low Temp: 27 °F
Mean Temp: 34 °F
Precipitation: 2.37"
Humidity: 77%
Dew Point: 27 °F
Wind: 6 mph
Pressure: 30.18 "Hg
Visibility: 8 mi
February Climate & Weather Averages in Sion
High Temp: 47 °F
Low Temp: 29 °F
Mean Temp: 38 °F
Precipitation: 1.62"
Humidity: 69%
Dew Point: 27 °F
Wind: 8 mph
Pressure: 30.14 "Hg
Visibility: 8 mi
March Climate & Weather Averages in Sion
High Temp: 57 °F
Low Temp: 35 °F
Mean Temp: 46 °F
Precipitation: 1.41"
Humidity: 60%
Dew Point: 31 °F
Wind: 11 mph
Pressure: 30.06 "Hg
Visibility: 8 mi
April Climate & Weather Averages in Sion
High Temp: 64 °F
Low Temp: 41 °F
Mean Temp: 53 °F
Precipitation: 1.34"
Humidity: 56%
Dew Point: 37 °F
Wind: 12 mph
Pressure: 29.95 "Hg
Visibility: 8 mi
May Climate & Weather Averages in Sion
High Temp: 71 °F
Low Temp: 49 °F
Mean Temp: 60 °F
Precipitation: 2.17"
Humidity: 60%
Dew Point: 46 °F
Wind: 12 mph
Pressure: 29.97 "Hg
Visibility: 8 mi
June Climate & Weather Averages in Sion
High Temp: 78 °F
Low Temp: 55 °F
Mean Temp: 67 °F
Precipitation: 1.90"
Humidity: 60%
Dew Point: 52 °F
Wind: 12 mph
Pressure: 29.99 "Hg
Visibility: 8 mi
July Climate & Weather Averages in Sion
High Temp: 81 °F
Low Temp: 58 °F
Mean Temp: 70 °F
Precipitation: 2.55"
Humidity: 61%
Dew Point: 55 °F
Wind: 12 mph
Pressure: 29.98 "Hg
Visibility: 8 mi
August Climate & Weather Averages in Sion
High Temp: 80 °F
Low Temp: 57 °F
Mean Temp: 68 °F
Precipitation: 2.41"
Humidity: 65%
Dew Point: 55 °F
Wind: 11 mph
Pressure: 30.00 "Hg
Visibility: 8 mi
September Climate & Weather Averages in Sion
High Temp: 72 °F
Low Temp: 51 °F
Mean Temp: 61 °F
Precipitation: 1.50"
Humidity: 69%
Dew Point: 50 °F
Wind: 10 mph
Pressure: 30.03 "Hg
Visibility: 8 mi
October Climate & Weather Averages in Sion
High Temp: 63 °F
Low Temp: 43 °F
Mean Temp: 53 °F
Precipitation: 1.66"
Humidity: 73%
Dew Point: 43 °F
Wind: 7 mph
Pressure: 30.07 "Hg
Visibility: 8 mi
November Climate & Weather Averages in Sion
High Temp: 50 °F
Low Temp: 34 °F
Mean Temp: 42 °F
Precipitation: 1.94"
Humidity: 76%
Dew Point: 34 °F
Wind: 6 mph
Pressure: 30.08 "Hg
Visibility: 8 mi
December Climate & Weather Averages in Sion
High Temp: 41 °F
Low Temp: 28 °F
Mean Temp: 34 °F
Precipitation: 2.78"
Humidity: 80%
Dew Point: 28 °F
Wind: 6 mph
Pressure: 30.17 "Hg
Visibility: 8 mi