Chatham Weather Forecast

    • 57
    • 72

    Mostly Cloudy

    • 53
    • 75

    Partly Sunny

    • 57
    • 76

    Mostly Sunny

    • 64
    • 80

    Rain Showers Likely

    • 65
    • 77

    Rain Showers Likely

    • 61
    • 77

    Chance Rain Showers

Today 26 Sep Sangamon

Mostly cloudy. A slight chance of Showers this Morning, then a chance of Showers this afternoon. Highs in the lower 70s. East Winds around 5 Mph. Chance of rain 30 percent.

Tonight 26 Sep Sangamon

Mostly cloudy with a chance of Sprinkles. Lows in the mid 50s. East Winds around 5 Mph.

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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

    77.2 °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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