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Climate & Weather Averages in Washington County, Illinois, USA

Now
68 °F

Sunny.


Feels Like: 68 °F
Forecast: 81 / 62 °F
Wind: 7 mph from North

Location: Lambert-St. Louis International Airport

Current Time: Jul 23, 2019 at 8:25:58 am

Latest Report: Jul 23, 2019 at 7:51 am


Visibility: 10 mi

Pressure: 30.15 "Hg

Humidity: 70%

Dew Point: 58 °F

Location of Washington CountyLocation

Annual Weather Averages in Lambert-St. Louis International Airport

Lambert-St. Louis International Airport is 59 miles from Washington County, so the actual climate in Washington County can vary a bit.

Based on weather reports collected during 1985–2015.

All Year Climate & Weather Averages in Washington County

High Temp: 89 °F

Low Temp: 25 °F

Mean Temp: 57 °F

Precipitation: 1.60"

Humidity: 65%

Dew Point: 45 °F

Wind: 8 mph

Pressure: 30.04 "Hg

Visibility: 9 mi

January Climate & Weather Averages in Washington County

High Temp: 41 °F

Low Temp: 25 °F

Mean Temp: 33 °F

Precipitation: 1.02"

Humidity: 69%

Dew Point: 23 °F

Wind: 9 mph

Pressure: 30.15 "Hg

Visibility: 9 mi

February Climate & Weather Averages in Washington County

High Temp: 45 °F

Low Temp: 28 °F

Mean Temp: 36 °F

Precipitation: 1.06"

Humidity: 66%

Dew Point: 25 °F

Wind: 9 mph

Pressure: 30.14 "Hg

Visibility: 9 mi

March Climate & Weather Averages in Washington County

High Temp: 57 °F

Low Temp: 37 °F

Mean Temp: 47 °F

Precipitation: 1.70"

Humidity: 61%

Dew Point: 33 °F

Wind: 9 mph

Pressure: 30.07 "Hg

Visibility: 9 mi

April Climate & Weather Averages in Washington County

High Temp: 68 °F

Low Temp: 47 °F

Mean Temp: 58 °F

Precipitation: 2.37"

Humidity: 59%

Dew Point: 43 °F

Wind: 9 mph

Pressure: 29.97 "Hg

Visibility: 10 mi

May Climate & Weather Averages in Washington County

High Temp: 77 °F

Low Temp: 58 °F

Mean Temp: 68 °F

Precipitation: 2.46"

Humidity: 63%

Dew Point: 54 °F

Wind: 8 mph

Pressure: 29.96 "Hg

Visibility: 9 mi

June Climate & Weather Averages in Washington County

High Temp: 86 °F

Low Temp: 67 °F

Mean Temp: 77 °F

Precipitation: 2.23"

Humidity: 64%

Dew Point: 63 °F

Wind: 7 mph

Pressure: 29.94 "Hg

Visibility: 9 mi

July Climate & Weather Averages in Washington County

High Temp: 89 °F

Low Temp: 71 °F

Mean Temp: 80 °F

Precipitation: 1.72"

Humidity: 64%

Dew Point: 67 °F

Wind: 6 mph

Pressure: 29.97 "Hg

Visibility: 9 mi

August Climate & Weather Averages in Washington County

High Temp: 88 °F

Low Temp: 70 °F

Mean Temp: 79 °F

Precipitation: 1.31"

Humidity: 65%

Dew Point: 66 °F

Wind: 6 mph

Pressure: 29.99 "Hg

Visibility: 9 mi

September Climate & Weather Averages in Washington County

High Temp: 81 °F

Low Temp: 61 °F

Mean Temp: 71 °F

Precipitation: 1.12"

Humidity: 64%

Dew Point: 58 °F

Wind: 6 mph

Pressure: 30.03 "Hg

Visibility: 9 mi

October Climate & Weather Averages in Washington County

High Temp: 69 °F

Low Temp: 49 °F

Mean Temp: 59 °F

Precipitation: 1.39"

Humidity: 63%

Dew Point: 45 °F

Wind: 8 mph

Pressure: 30.06 "Hg

Visibility: 10 mi

November Climate & Weather Averages in Washington County

High Temp: 56 °F

Low Temp: 38 °F

Mean Temp: 47 °F

Precipitation: 1.58"

Humidity: 65%

Dew Point: 35 °F

Wind: 9 mph

Pressure: 30.11 "Hg

Visibility: 9 mi

December Climate & Weather Averages in Washington County

High Temp: 44 °F

Low Temp: 29 °F

Mean Temp: 36 °F

Precipitation: 1.28"

Humidity: 71%

Dew Point: 27 °F

Wind: 8 mph

Pressure: 30.14 "Hg

Visibility: 9 mi

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Quick Climate Info

Hottest MonthJuly (80 °F avg)
Coldest MonthJanuary (33 °F avg)
Wettest MonthMay (2.46" avg)
Windiest MonthMarch (9 mph avg)
Annual Rainfall19.24" (per year)

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