Lake Mattoon Weather Forecast

    • 69
    • 88

    Isolated Thunderstorms

    • 72
    • 89

    Slight Chance Thunderstorms

    • 73
    • 91

    Slight Chance Thunderstorms

    • 71
    • 90

    Chance Thunderstorms

    • 67
    • 86

    Rain Showers Likely

    • 64
    • 82

    Chance Rain Showers

Today 8 Aug Shelby

Mostly sunny with isolated Showers and Thunderstorms. Near steady temperature in the upper 80s. West Winds around 5 Mph. Chance of rain 20 percent.

Tonight 8 Aug Shelby

Mostly clear. Humid with Lows in the upper 60s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mattoon Temperature Statistics

August Temperature

Mattoon / Charleston, Coles County Memorial Airport (13 miles)

  • Lowest 3 August, 2026

    61.6 °F

  • Average August

    73.3 °F

  • Highest 4 August, 2026

    85.6 °F

Climate (2021–2026)

Mattoon / Charleston, Coles County Memorial Airport (13 miles)

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    55.4 °F

  • Average High 2021–2026

    65 °F
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