Currently: 20 °F. Overcast. (Weather station: Southern Illinois Airport, USA). See more current weatherAnnual Weather Averages Near Grand Tower
Averages are for Southern Illinois Airport, which is 17 miles from Grand Tower.
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Grand Tower
High Temp: 89 °F
Low Temp: 25 °F
Mean Temp: 57 °F
Precipitation: 3.48"
Humidity: 71%
Dew Point: 47 °F
Wind: 11 mph
Pressure: 30.06 "Hg
Visibility: 9 mi
January Climate & Weather Averages in Grand Tower
High Temp: 42 °F
Low Temp: 25 °F
Mean Temp: 34 °F
Precipitation: 2.54"
Humidity: 73%
Dew Point: 26 °F
Wind: 14 mph
Pressure: 30.16 "Hg
Visibility: 9 mi
February Climate & Weather Averages in Grand Tower
High Temp: 47 °F
Low Temp: 29 °F
Mean Temp: 38 °F
Precipitation: 2.49"
Humidity: 70%
Dew Point: 28 °F
Wind: 14 mph
Pressure: 30.13 "Hg
Visibility: 9 mi
March Climate & Weather Averages in Grand Tower
High Temp: 57 °F
Low Temp: 37 °F
Mean Temp: 47 °F
Precipitation: 4.08"
Humidity: 66%
Dew Point: 36 °F
Wind: 14 mph
Pressure: 30.08 "Hg
Visibility: 9 mi
April Climate & Weather Averages in Grand Tower
High Temp: 68 °F
Low Temp: 46 °F
Mean Temp: 57 °F
Precipitation: 4.74"
Humidity: 65%
Dew Point: 45 °F
Wind: 15 mph
Pressure: 29.98 "Hg
Visibility: 10 mi
May Climate & Weather Averages in Grand Tower
High Temp: 77 °F
Low Temp: 56 °F
Mean Temp: 67 °F
Precipitation: 4.26"
Humidity: 71%
Dew Point: 57 °F
Wind: 12 mph
Pressure: 29.98 "Hg
Visibility: 9 mi
June Climate & Weather Averages in Grand Tower
High Temp: 86 °F
Low Temp: 65 °F
Mean Temp: 76 °F
Precipitation: 4.19"
Humidity: 70%
Dew Point: 65 °F
Wind: 10 mph
Pressure: 29.96 "Hg
Visibility: 9 mi
July Climate & Weather Averages in Grand Tower
High Temp: 89 °F
Low Temp: 69 °F
Mean Temp: 79 °F
Precipitation: 3.62"
Humidity: 73%
Dew Point: 69 °F
Wind: 8 mph
Pressure: 29.99 "Hg
Visibility: 9 mi
August Climate & Weather Averages in Grand Tower
High Temp: 87 °F
Low Temp: 66 °F
Mean Temp: 77 °F
Precipitation: 2.72"
Humidity: 74%
Dew Point: 68 °F
Wind: 7 mph
Pressure: 30.01 "Hg
Visibility: 8 mi
September Climate & Weather Averages in Grand Tower
High Temp: 81 °F
Low Temp: 57 °F
Mean Temp: 69 °F
Precipitation: 3.09"
Humidity: 73%
Dew Point: 60 °F
Wind: 7 mph
Pressure: 30.04 "Hg
Visibility: 8 mi
October Climate & Weather Averages in Grand Tower
High Temp: 70 °F
Low Temp: 46 °F
Mean Temp: 58 °F
Precipitation: 3.46"
Humidity: 69%
Dew Point: 48 °F
Wind: 10 mph
Pressure: 30.07 "Hg
Visibility: 9 mi
November Climate & Weather Averages in Grand Tower
High Temp: 57 °F
Low Temp: 36 °F
Mean Temp: 46 °F
Precipitation: 3.51"
Humidity: 70%
Dew Point: 36 °F
Wind: 13 mph
Pressure: 30.14 "Hg
Visibility: 9 mi
December Climate & Weather Averages in Grand Tower
High Temp: 46 °F
Low Temp: 29 °F
Mean Temp: 37 °F
Precipitation: 3.10"
Humidity: 75%
Dew Point: 30 °F
Wind: 13 mph
Pressure: 30.14 "Hg
Visibility: 9 mi