Chatham Weather Forecast

    • 25
    • 32

    Increasing Clouds

    • 20
    • 38

    Mostly Cloudy

    • 22
    • 32

    Partly Sunny

    • 23
    • 39

    Mostly Cloudy

    • 23
    • 38

    Partly Sunny

    • 28
    • 43

    Partly Sunny

Today 30 Dec Sangamon

Sunny in the Morning, then becoming partly sunny. Highs in the lower 30s. West Winds 10 to 15 Mph.

Tonight 30 Dec Sangamon

Partly cloudy and not as cool. Near steady temperature in the upper 20s. West Winds around 10 Mph with Gusts up to 20 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 14 December, 2025

    -6 °F

  • Average December

    30.9 °F

  • Highest 23 December, 2025

    60.1 °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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