Chatham Weather Forecast

    • 68
    • 99

    Hot

    • 62
    • 89

    Mostly Sunny

    • 64
    • 89

    Mostly Sunny

    • 74
    • 96

    Mostly Sunny

    • 71
    • 99

    Hot

    • 64
    • 91

    Slight Chance Rain Showers

Today 5 Sep Sangamon

Sunny, hot with Highs in the upper 90s. Northwest Winds 5 to 10 Mph. Heat index Values up to 107.

Tonight 5 Sep Sangamon

Mostly clear. Lows in the mid 70s. Southwest 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 1 September, 2026

    75.7 °F

  • Average September

    87.4 °F

  • Highest 1 September, 2026

    99.6 °F

Climate (2021–2026)

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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