Charleston Weather Forecast

    • 43
    • 69

    Mostly Sunny

    • 51
    • 69

    Chance Thunderstorms

    • 62
    • 77

    Chance Thunderstorms

    • 64
    • 85

    Chance Thunderstorms

    • 68
    • 84

    Chance Thunderstorms

    • 67
    • 87

    Rain Showers Likely

Today 13 May Coles

Sunny, cooler with Highs in the upper 60s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 13 May Coles

Mostly clear. Cooler with Lows in the lower 40s. North Winds 10 to 15 Mph with Gusts up to 25 Mph, Diminishing to around 5 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Charleston Temperature Statistics

May Temperature

Mattoon / Charleston, Coles County Memorial Airport (5.6 miles)

  • Lowest 7 May, 2026

    38.6 °F

  • Average May

    55.6 °F

  • Highest 4 May, 2026

    74.6 °F

Climate (2021–Present)

Mattoon / Charleston, Coles County Memorial Airport (5.6 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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