Illiopolis Weather Forecast

    • 54
    • 69

    Chance Rain Showers

    • 51
    • 78

    Rain Showers

    • 42
    • 59

    Rain Showers

    • 41
    • 58

    Chance Rain Showers

    • 46
    • 61

    Chance Rain Showers

    • 46
    • 65

    Chance Rain Showers

    • 51
    • 72

    Mostly Sunny

Today 3 May Sangamon

Partly sunny with a slight chance of Showers and Thunderstorms. Breezy and not as cool. Near steady temperature in the upper 60s. Southwest Winds 20 to 25 Mph with Gusts up to 40 Mph. Chance of rain 20 percent.

Tonight 3 May Sangamon

Patchy blowing dust this evening. Mostly cloudy with a slight chance of Showers and Thunderstorms this Evening, then partly cloudy with a chance of Showers and Thunderstorms after midnight. Not as cool with Lows in the mid 50s. Southwest Winds 10 to 15 Mph. Chance of rain 50 percent.

Graph Plots Open in Graphs
  • Temperature Forecast NOAA

  • Temperature Real-Time

Illiopolis Temperature Statistics

May Temperature

Decatur Airport (19.3 miles)

  • Lowest

  • Average May

  • Highest

Climate (2021–Present)

Decatur Airport (19.3 miles)

Take a look at our website widgetsAvailable free! Find Out More
  • Average Low 2021–2026

    45.3 °F
  • Average 2021–2026

    55.5 °F
  • Average High 2021–2026

    65.5 °F
Get WillyWeather+ to remove ads