Annual Weather Averages Near Oswego
Averages are for Dupage Airport, which is 16 miles from Oswego.
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Oswego
High Temp: 84 °F
Low Temp: 16 °F
Mean Temp: 49 °F
Precipitation: 2.76"
Humidity: 72%
Dew Point: 40 °F
Wind: 15 mph
Pressure: 30.04 "Hg
Visibility: 9 mi
January Climate & Weather Averages in Oswego
High Temp: 31 °F
Low Temp: 16 °F
Mean Temp: 23 °F
Precipitation: 1.45"
Humidity: 79%
Dew Point: 18 °F
Wind: 18 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: 1.34"
Humidity: 75%
Dew Point: 20 °F
Wind: 18 mph
Pressure: 30.10 "Hg
Visibility: 8 mi
March Climate & Weather Averages in Oswego
High Temp: 47 °F
Low Temp: 27 °F
Mean Temp: 37 °F
Precipitation: 1.88"
Humidity: 70%
Dew Point: 28 °F
Wind: 18 mph
Pressure: 30.09 "Hg
Visibility: 9 mi
April Climate & Weather Averages in Oswego
High Temp: 60 °F
Low Temp: 37 °F
Mean Temp: 48 °F
Precipitation: 3.39"
Humidity: 65%
Dew Point: 36 °F
Wind: 19 mph
Pressure: 29.98 "Hg
Visibility: 10 mi
May Climate & Weather Averages in Oswego
High Temp: 71 °F
Low Temp: 48 °F
Mean Temp: 59 °F
Precipitation: 4.19"
Humidity: 68%
Dew Point: 48 °F
Wind: 16 mph
Pressure: 29.98 "Hg
Visibility: 9 mi
June Climate & Weather Averages in Oswego
High Temp: 81 °F
Low Temp: 58 °F
Mean Temp: 69 °F
Precipitation: 3.92"
Humidity: 68%
Dew Point: 58 °F
Wind: 13 mph
Pressure: 29.94 "Hg
Visibility: 9 mi
July Climate & Weather Averages in Oswego
High Temp: 84 °F
Low Temp: 63 °F
Mean Temp: 73 °F
Precipitation: 3.45"
Humidity: 70%
Dew Point: 63 °F
Wind: 12 mph
Pressure: 29.97 "Hg
Visibility: 9 mi
August Climate & Weather Averages in Oswego
High Temp: 82 °F
Low Temp: 61 °F
Mean Temp: 72 °F
Precipitation: 3.41"
Humidity: 73%
Dew Point: 62 °F
Wind: 11 mph
Pressure: 30.00 "Hg
Visibility: 9 mi
September Climate & Weather Averages in Oswego
High Temp: 76 °F
Low Temp: 53 °F
Mean Temp: 64 °F
Precipitation: 3.10"
Humidity: 71%
Dew Point: 54 °F
Wind: 12 mph
Pressure: 30.03 "Hg
Visibility: 9 mi
October Climate & Weather Averages in Oswego
High Temp: 63 °F
Low Temp: 41 °F
Mean Temp: 52 °F
Precipitation: 3.06"
Humidity: 71%
Dew Point: 43 °F
Wind: 15 mph
Pressure: 30.04 "Hg
Visibility: 10 mi
November Climate & Weather Averages in Oswego
High Temp: 48 °F
Low Temp: 30 °F
Mean Temp: 39 °F
Precipitation: 2.17"
Humidity: 74%
Dew Point: 31 °F
Wind: 17 mph
Pressure: 30.09 "Hg
Visibility: 9 mi
December Climate & Weather Averages in Oswego
High Temp: 36 °F
Low Temp: 21 °F
Mean Temp: 28 °F
Precipitation: 1.71"
Humidity: 79%
Dew Point: 23 °F
Wind: 17 mph
Pressure: 30.09 "Hg
Visibility: 8 mi