Annual Weather Averages Near Oswego
Averages are for Dupage Airport, which is 16 miles from Oswego.
Based on weather reports collected during 1985–2015.
All Year Climate & Weather Averages in Oswego
High Temp: 84 °F
Low Temp: 15 °F
Mean Temp: 49 °F
Precipitation: 1.29"
Humidity: 72%
Dew Point: 40 °F
Wind: 9 mph
Pressure: 30.04 "Hg
Visibility: 9 mi
January Climate & Weather Averages in Oswego
High Temp: 31 °F
Low Temp: 15 °F
Mean Temp: 23 °F
Precipitation: 0.64"
Humidity: 80%
Dew Point: 18 °F
Wind: 10 mph
Pressure: 30.10 "Hg
Visibility: 8 mi
February Climate & Weather Averages in Oswego
High Temp: 35 °F
Low Temp: 18 °F
Mean Temp: 26 °F
Precipitation: 0.57"
Humidity: 77%
Dew Point: 20 °F
Wind: 10 mph
Pressure: 30.11 "Hg
Visibility: 9 mi
March Climate & Weather Averages in Oswego
High Temp: 47 °F
Low Temp: 27 °F
Mean Temp: 37 °F
Precipitation: 0.93"
Humidity: 71%
Dew Point: 28 °F
Wind: 10 mph
Pressure: 30.08 "Hg
Visibility: 10 mi
April Climate & Weather Averages in Oswego
High Temp: 60 °F
Low Temp: 37 °F
Mean Temp: 49 °F
Precipitation: 1.76"
Humidity: 65%
Dew Point: 37 °F
Wind: 10 mph
Pressure: 29.98 "Hg
Visibility: 10 mi
May Climate & Weather Averages in Oswego
High Temp: 71 °F
Low Temp: 48 °F
Mean Temp: 60 °F
Precipitation: 2.11"
Humidity: 67%
Dew Point: 48 °F
Wind: 9 mph
Pressure: 29.98 "Hg
Visibility: 10 mi
June Climate & Weather Averages in Oswego
High Temp: 81 °F
Low Temp: 58 °F
Mean Temp: 69 °F
Precipitation: 2.01"
Humidity: 68%
Dew Point: 58 °F
Wind: 7 mph
Pressure: 29.95 "Hg
Visibility: 10 mi
July Climate & Weather Averages in Oswego
High Temp: 84 °F
Low Temp: 63 °F
Mean Temp: 73 °F
Precipitation: 1.50"
Humidity: 70%
Dew Point: 63 °F
Wind: 7 mph
Pressure: 29.98 "Hg
Visibility: 10 mi
August Climate & Weather Averages in Oswego
High Temp: 82 °F
Low Temp: 61 °F
Mean Temp: 71 °F
Precipitation: 1.72"
Humidity: 73%
Dew Point: 62 °F
Wind: 6 mph
Pressure: 30.01 "Hg
Visibility: 9 mi
September Climate & Weather Averages in Oswego
High Temp: 75 °F
Low Temp: 52 °F
Mean Temp: 64 °F
Precipitation: 1.19"
Humidity: 71%
Dew Point: 54 °F
Wind: 7 mph
Pressure: 30.04 "Hg
Visibility: 10 mi
October Climate & Weather Averages in Oswego
High Temp: 62 °F
Low Temp: 40 °F
Mean Temp: 51 °F
Precipitation: 1.21"
Humidity: 71%
Dew Point: 42 °F
Wind: 8 mph
Pressure: 30.05 "Hg
Visibility: 10 mi
November Climate & Weather Averages in Oswego
High Temp: 48 °F
Low Temp: 30 °F
Mean Temp: 39 °F
Precipitation: 1.14"
Humidity: 75%
Dew Point: 32 °F
Wind: 10 mph
Pressure: 30.08 "Hg
Visibility: 9 mi
December Climate & Weather Averages in Oswego
High Temp: 35 °F
Low Temp: 20 °F
Mean Temp: 28 °F
Precipitation: 0.69"
Humidity: 81%
Dew Point: 23 °F
Wind: 10 mph
Pressure: 30.10 "Hg
Visibility: 8 mi