Chatham Weather Forecast

    • 68
    • 81

    Rain Showers

    • 53
    • 81

    Rain Showers

    • 46
    • 68

    Mostly Cloudy

    • 53
    • 72

    Mostly Cloudy

    • 57
    • 74

    Chance Rain Showers

    • 59
    • 81

    Partly Sunny

Today 18 May Sangamon

Thunderstorms likely. Showers. Locally heavy rainfall possible early. Near steady temperature in the mid 70s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 90 percent.

Tonight 18 May Sangamon

Mostly cloudy with a chance of Showers and Thunderstorms. Lows in the upper 60s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chatham Temperature Statistics

May Temperature

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

  • Lowest 7 May, 2026

    39.7 °F

  • Average May

    59.5 °F

  • Highest 12 May, 2026

    83.6 °F

Climate (2021–Present)

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

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  • Average Low 2021–2026

    45 °F

  • Average 2021–2026

    55.5 °F

  • Average High 2021–2026

    65.6 °F
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