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Climate & Weather Averages in Oswego, Illinois, USA

Currently: 75 °F. Passing clouds. (Weather station: Dupage Airport, USA). See more current weather

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

Quick Climate Info

Hottest MonthJuly (73 °F avg)
Coldest MonthJanuary (23 °F avg)
Wettest MonthMay (4.19" avg)
Windiest MonthApril (19 mph avg)
Annual precip.33.08" (per year)

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