Chatham Weather Forecast

    • 74
    • 86

    Chance Thunderstorms

    • 75
    • 94

    Chance Thunderstorms

    • 69
    • 91

    Slight Chance Thunderstorms

    • 64
    • 84

    Partly Sunny

    • 70
    • 86

    Partly Sunny

    • 67
    • 89

    Chance Rain Showers

    • 64
    • 81

    Slight Chance Rain Showers

Today 14 Aug Sangamon

Partly sunny with a slight chance of Showers and Thunderstorms. Highs in the upper 80s. Southeast Winds around 5 Mph. Chance of rain 20 percent. Heat index Values up to 100.

Tonight 14 Aug Sangamon

Mostly cloudy. A slight chance of Showers and Thunderstorms this Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the mid 70s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chatham Temperature Statistics

August Temperature

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

  • Lowest 3 August, 2026

    60.7 °F

  • Average August

    77.2 °F

  • Highest 11 August, 2026

    92.6 °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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