TODAY MAY17
TEMPERATURE61
HUMIDITY97
PRESSURE30.11
WIND COND.110 20.5
  • 7163Tue70%50%
  • 8164Wed40%30%
  • 8465Thu
  • 8565Fri
  • 8764Sat
daynightWeather update from Decatur Airport at

Key findings

  • The highest monthly average temperature in Forsyth for July is 76.3 degrees
  • The lowest monthly average temperature in Forsyth for January is 28.3 degrees
  • The most monthly precipitation in Forsyth occurs in June with 5 inches
  • The air quality index in Forsyth is 12% better than the national average
  • The pollution index in Forsyth is 86% better than the national average

Compare Forsyth, IL Weather

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      Forsyth Average Temperature

      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
      January20°F38°F28°F1.5"
      February22°F40°F30°F1.8"
      March34°F55°F43°F2.3"
      April44°F67°F55°F4.2"
      May54°F76°F65°F4.6"
      June64°F85°F74°F5.0"
      July66°F87°F76°F3.8"
      August64°F86°F75°F2.7"
      September57°F80°F68°F3.5"
      October46°F68°F56°F3.6"
      November35°F54°F44°F2.7"
      December26°F41°F33°F3.1"

      Forsyth 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.
      IndexForsythIllinoisNational
      Air quality index444150
      Pollution index703,2183,347,2955,066,862

      Forsyth air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality255
      Days with moderate air quality110
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Forsyth air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.020%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Forsyth temperature with heat index

      Forsyth monthly precipitation with daily maximum

      Forsyth monthly snow depth with daily maximum

      Forsyth monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      LaPlace, IL1614412%
      Illiopolis, IL8224412%
      Cisco, IL2404412%
      Weldon, IL5004412%
      Maroa, IL1,7244412%
      Forsyth, IL3,4214412%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Sharpsburg, PA3,4215612%
      Justin, TX3,422512%
      Story City, IA3,4233726%
      Pine Lawn, MO3,423548%
      Gibson City, IL3,4234216%
      Forsyth, IL3,4214412%
      Source: The Forsyth, 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.