Chatham Weather Forecast

    • 63
    • 74

    Rain Showers

    • 68
    • 81

    Chance Thunderstorms

    • 74
    • 91

    Mostly Sunny

    • 76
    • 94

    Mostly Sunny

    • 75
    • 95

    Sunny

    • 75
    • 95

    Mostly Sunny

Today 26 Jun Sangamon

Showers likely with a chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Near steady temperature in the lower 70s. East Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 70 percent.

Tonight 26 Jun Sangamon

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then a slight chance of Showers after midnight. Patchy fog after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Lows in the lower 60s. East Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Real-Time

Chatham Temperature Statistics

June Temperature

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

  • Lowest 3 June, 2026

    50.6 °F

  • Average June

    71.9 °F

  • Highest 10 June, 2026

    90.6 °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

    55.4 °F

  • Average High 2021–2026

    65.6 °F
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