Chatham Weather Forecast

    • 19
    • 32

    Mostly Sunny

    • 28
    • 40

    Partly Sunny

    • 35
    • 41

    Rain Likely

    • 15
    • 50

    Slight Chance Rain/Snow

    • 26
    • 32

    Mostly Cloudy

    • 26
    • 48

    Mostly Cloudy

    • 30
    • 42

    Mostly Cloudy

Today 15 Dec Sangamon

Sunny. Not as cool with Highs around 30. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 15 Dec Sangamon

Mostly clear. Not as cool with Lows around 18. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chatham Temperature Statistics

December Temperature

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

  • Lowest 13 December, 2025

    1 °F

  • Average December

    24.9 °F

  • Highest 10 December, 2025

    42.1 °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

    55.1 °F

  • Average High 2020–2025

    65 °F
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