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Climate & Weather Averages in Plainfield, Illinois, USA

Currently: 86 °F. Clear. (Weather station: Lewis University Airport, USA). See more current weather

Annual Weather Averages Near Plainfield

Averages are for Lewis University Airport, which is 7 miles from Plainfield.

Based on weather reports collected during 2012–2021.

All Year Climate & Weather Averages in Plainfield

High Temp: 85 °F

Low Temp: 20 °F

Mean Temp: 53 °F

Precipitation: 3.04"

Humidity: 73%

Dew Point: 42 °F

Wind: 17 mph

Pressure: 128.68 "Hg

Visibility: 9 mi

January Climate & Weather Averages in Plainfield

High Temp: 34 °F

Low Temp: 20 °F

Mean Temp: 27 °F

Precipitation: 1.51"

Humidity: 81%

Dew Point: 20 °F

Wind: 20 mph

Pressure: 129.18 "Hg

Visibility: 8 mi

February Climate & Weather Averages in Plainfield

High Temp: 35 °F

Low Temp: 21 °F

Mean Temp: 28 °F

Precipitation: 1.66"

Humidity: 78%

Dew Point: 20 °F

Wind: 19 mph

Pressure: 127.92 "Hg

Visibility: 8 mi

March Climate & Weather Averages in Plainfield

High Temp: 48 °F

Low Temp: 33 °F

Mean Temp: 40 °F

Precipitation: 1.97"

Humidity: 71%

Dew Point: 30 °F

Wind: 20 mph

Pressure: 128.95 "Hg

Visibility: 9 mi

April Climate & Weather Averages in Plainfield

High Temp: 59 °F

Low Temp: 41 °F

Mean Temp: 50 °F

Precipitation: 3.76"

Humidity: 65%

Dew Point: 36 °F

Wind: 20 mph

Pressure: 128.58 "Hg

Visibility: 9 mi

May Climate & Weather Averages in Plainfield

High Temp: 72 °F

Low Temp: 53 °F

Mean Temp: 62 °F

Precipitation: 4.72"

Humidity: 67%

Dew Point: 49 °F

Wind: 18 mph

Pressure: 128.45 "Hg

Visibility: 9 mi

June Climate & Weather Averages in Plainfield

High Temp: 82 °F

Low Temp: 63 °F

Mean Temp: 73 °F

Precipitation: 4.27"

Humidity: 66%

Dew Point: 58 °F

Wind: 15 mph

Pressure: 128.18 "Hg

Visibility: 9 mi

July Climate & Weather Averages in Plainfield

High Temp: 85 °F

Low Temp: 68 °F

Mean Temp: 77 °F

Precipitation: 3.15"

Humidity: 70%

Dew Point: 63 °F

Wind: 13 mph

Pressure: 128.57 "Hg

Visibility: 10 mi

August Climate & Weather Averages in Plainfield

High Temp: 84 °F

Low Temp: 67 °F

Mean Temp: 75 °F

Precipitation: 4.18"

Humidity: 72%

Dew Point: 62 °F

Wind: 11 mph

Pressure: 128.64 "Hg

Visibility: 9 mi

September Climate & Weather Averages in Plainfield

High Temp: 78 °F

Low Temp: 61 °F

Mean Temp: 69 °F

Precipitation: 2.48"

Humidity: 72%

Dew Point: 57 °F

Wind: 14 mph

Pressure: 128.63 "Hg

Visibility: 10 mi

October Climate & Weather Averages in Plainfield

High Temp: 64 °F

Low Temp: 47 °F

Mean Temp: 55 °F

Precipitation: 5.06"

Humidity: 74%

Dew Point: 45 °F

Wind: 16 mph

Pressure: 128.61 "Hg

Visibility: 9 mi

November Climate & Weather Averages in Plainfield

High Temp: 49 °F

Low Temp: 34 °F

Mean Temp: 41 °F

Precipitation: 1.98"

Humidity: 76%

Dew Point: 32 °F

Wind: 18 mph

Pressure: 129.30 "Hg

Visibility: 9 mi

December Climate & Weather Averages in Plainfield

High Temp: 40 °F

Low Temp: 27 °F

Mean Temp: 33 °F

Precipitation: 1.79"

Humidity: 82%

Dew Point: 26 °F

Wind: 18 mph

Pressure: 129.10 "Hg

Visibility: 8 mi

Quick Climate Info

Hottest MonthJuly (77 °F avg)
Coldest MonthJanuary (27 °F avg)
Wettest MonthOctober (5.06" avg)
Windiest MonthApril (20 mph avg)
Annual precip.36.54" (per year)

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