TODAY AUG19
TEMPERATURE70
HUMIDITY90
PRESSURE29.97
WIND COND.30 4.7
  • 8067Mon70%60%
  • 7759Tue40%30%
  • 7654Wed
  • 7857Thu
  • 7965Fri
daynightWeather update from Mattoon / Charleston, Coles County Memorial Airport at

Charleston Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January21°F37°F28°F1.5"
February22°F39°F30°F1.7"
March35°F54°F44°F2.1"
April45°F66°F55°F4.9"
May55°F75°F64°F3.8"
June64°F84°F74°F4.7"
July66°F86°F75°F4.2"
August64°F85°F74°F2.1"
September57°F79°F67°F3.0"
October46°F67°F56°F2.9"
November35°F53°F44°F2.4"
December27°F41°F33°F2.4"

Did you know?

  • The highest monthly average temperature in Charleston for July is 75 degrees.
  • The lowest monthly average temperature in Charleston for January is 28 degrees.
  • The most monthly precipitation in Charleston occurs in April with 4.9 inches.
  • The air quality index in Charleston is 25% better than the national average.
  • The pollution index in Charleston is 67% better than the national average.

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Compare Charleston, IL Weather To Other Cities

Charleston air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexCharlestonIllinoisNational
Air quality index374150
Pollution index1,664,3703,347,2955,066,862

Charleston air quality information

MeasurementTotal
Days measured214
Days with good air quality201
Days with moderate air quality13
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Charleston air quality information

PollutantTotal
Arsenic0.001%
Benzene0.040%
Carbon Tetrachloride0.000%
Lead0.030%
Mercury0.003%

Average monthly Charleston temperature with heat index

Charleston monthly precipitation with daily maximum

Charleston monthly snow depth with daily maximum

Charleston monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Hindsboro, IL3493628%
Arcola, IL2,8813628%
Humboldt, IL4833628%
Oakland, IL8983628%
Mattoon, IL17,3993726%
Charleston, IL21,2573726%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Winter Gardens, CA21,2556122%
Orchards, WA21,2493824%
Hutto, TX21,2414118%
Fort Walton Beach, FL21,2383138%
Marquette, MI21,282884%
Charleston, IL21,2573726%
Source: The Charleston, IL weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.