Chatham Weather Forecast

    • 57
    • 73

    Rain Showers

    • 67
    • 74

    Chance Rain Showers

    • 66
    • 85

    Rain Showers Likely

    • 66
    • 72

    Rain Showers Likely

    • 66
    • 79

    Chance Rain Showers

    • 63
    • 76

    Chance Rain Showers

Today 13 Sep Central Cook

Partly cloudy in the Morning, then becoming mostly cloudy. Scattered Showers in the afternoon. Highs in the mid 70s. North Winds 5 to 10 Mph. Chance of precipitation 40 percent.

Tonight 13 Sep Central Cook

Mostly clear. Lows in the mid 50s. North Winds 5 to 10 Mph.

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Chatham Temperature Statistics

September Temperature

Chicago, Chicago Midway Airport (7.5 miles)

  • Lowest 8 September, 2026

    66 °F

  • Average September

    79 °F

  • Highest 2 September, 2026

    96.1 °F

Climate (2021–2026)

Chicago, Chicago Midway Airport (7.5 miles)

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  • Average Low 2021–2026

    46.7 °F

  • Average 2021–2026

    54.3 °F

  • Average High 2021–2026

    61.9 °F
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