Chatham Weather Forecast

    • 70
    • 92

    Chance Thunderstorms

    • 62
    • 85

    Rain Showers Likely

    • 55
    • 72

    Rain Showers Likely

    • 52
    • 68

    Partly Sunny

    • 53
    • 71

    Partly Sunny

    • 55
    • 73

    Partly Sunny

Today 19 Sep Sangamon

Partly sunny this Morning, then becoming mostly cloudy. Highs in the lower 90s. Southwest Winds around 5 Mph.

Tonight 19 Sep Sangamon

Mostly cloudy in the Evening, then partly cloudy with a slight chance of Showers and Thunderstorms after midnight. Lows around 70. South Winds around 5 Mph, becoming southwest after midnight. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chatham Temperature Statistics

September Temperature

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

  • Lowest 14 September, 2026

    56.6 °F

  • Average September

    79.4 °F

  • Highest 2 September, 2026

    100.7 °F

Climate (2021–2026)

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

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  • Average Low 2021–2026

    45.1 °F

  • Average 2021–2026

    55.6 °F

  • Average High 2021–2026

    65.7 °F
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