Best year time to visit Illiopolis

General weather information about Illiopolis

Average annual temperature is 13.3 °C

Absolute maximum temperature: 36.0 °C

Absolute minimum temperature: -13.5 °C

Number of sunny days: 196 days

Number of rainy days: 160 days

Number of snow days: 9 days

Look at detailed online map of Illiopolis

* Weather data for Illiopolis United States is based on climate observations for 2026 year

Illiopolis air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)19.417.322.227.731.433.235.036.032.129.224.916.6
Average daytime temperature (°C)6.69.411.219.325.129.229.428.226.119.312.78.7
Average temperature (°C)1.93.35.412.318.723.024.323.320.714.27.04.6
Average night temperature (°C)-1.3-1.31.06.412.616.919.519.015.810.02.41.8
Absolute minimum temperature (°C)-13.2-13.5-9.4-1.83.811.215.012.010.2-2.4-8.8-7.5

Illiopolis monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.013.011.010.09.0
Daylight mean duration (h)9.710.712.013.314.414.914.713.712.511.210.09.4
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)4.37.46.69.811.112.812.610.410.27.87.75.0
Precipitation (mm)688311761434511014294812074
Sunny days151612192020131016182215
Rainy days10111811111018211413815
Snow days611000000001

Illiopolis - weather forecast by months

Illiopolis weather in januaryIlliopolis weather in februaryIlliopolis weather in marchIlliopolis weather in aprilIlliopolis weather in mayIlliopolis weather in juneIlliopolis weather in julyIlliopolis weather in augustIlliopolis weather in septemberIlliopolis weather in octoberIlliopolis weather in novemberIlliopolis weather in december

Best time to visit Illiopolis:

The best time to visit Illiopolis during the most sunny months:

  • May — 11.1(h)
  • June — 12.8(h)
  • July — 12.6(h)

The largest precipitation sum in Illiopolis is at

  • March — 117(mm)
  • July — 110(mm)
  • August — 142(mm)

    • Weather forecast in the closest to Illiopolis admin centers

    Weather forecast in the closest towns to Illiopolis

    Explore Illiopolis

    See also
    MapTrains schedule
    Plan your trip
    AccommodationExperiencesBlog

    Frequently asked questions

    When is the best time to visit Illiopolis?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Illiopolis.
    What is the weather like in Illiopolis?
    See average temperature, rainfall and daylight hours for Illiopolis by month in the table above.
    How many sunny days does Illiopolis have?
    The monthly weather statistics above show sunshine and rainfall patterns for Illiopolis throughout the year.