Chatham Weather Forecast

    • 16
    • 34

    Mostly Cloudy

    • 20
    • 28

    Partly Sunny

    • 35
    • 44

    Slight Chance Rain

    • 21
    • 41

    Chance Snow

    • 13
    • 31

    Chance Snow

    • 1
    • 21

    Mostly Cloudy

    • 1
    • 14

    Mostly Cloudy

Today 7 Dec Sangamon

Cloudy. Highs in the mid 30s. Temperature falling into the upper 20s late. North Winds around 15 Mph with Gusts up to 25 Mph.

Tonight 7 Dec Sangamon

Mostly cloudy. Much cooler with Lows around 15. North Winds 10 to 15 Mph, Diminishing to around 5 Mph.

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  • Temperature Real-Time

Chatham Temperature Statistics

December Temperature

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

  • Lowest 4 December, 2025

    1.9 °F

  • Average December

    20.5 °F

  • Highest 3 December, 2025

    33.1 °F

Climate (2020–Present)

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

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  • Average Low 2020–2025

    44.9 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    65.1 °F
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