Chatham Weather Forecast

    • 48
    • 67

    Decreasing Clouds

    • 52
    • 70

    Rain Showers

    • 56
    • 68

    Rain Showers

    • 59
    • 78

    Chance Rain Showers

    • 59
    • 80

    Slight Chance Thunderstorms

    • 61
    • 82

    Chance Rain Showers

Today 20 May Sangamon

Mostly cloudy in the Morning, then becoming partly sunny. Cooler with Highs in the upper 60s. Northeast Winds around 10 Mph.

Tonight 20 May Sangamon

Mostly cloudy with a 40 percent chance of Showers. Cooler with Lows in the lower 50s. North Winds around 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chatham Temperature Statistics

May Temperature

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

  • Lowest 7 May, 2026

    39.7 °F

  • Average May

    60.6 °F

  • Highest 17 May, 2026

    84.9 °F

Climate (2021–Present)

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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