Greencastle Weather Forecast

    • 68
    • 85

    Slight Chance Thunderstorms

    • 71
    • 86

    Chance Rain Showers

    • 65
    • 86

    Rain Showers Likely

    • 60
    • 73

    Rain Showers Likely

    • 55
    • 67

    Chance Rain Showers

    • 55
    • 67

    Partly Sunny

Today 17 Sep Sullivan

Partly cloudy early this Morning, then clearing. Areas of dense fog early this morning. A slight chance of Showers and Thunderstorms this morning. Highs in the mid 80s. South Winds around 5 Mph, becoming northwest this afternoon. Chance of rain 20 percent.

Tonight 17 Sep Sullivan

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the upper 60s. Northeast Winds 5 to 10 Mph.

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  • Temperature Real-Time

Greencastle Temperature Statistics

September Temperature

Kirksville, Kirksville Regional Airport (20.5 miles)

  • Lowest 14 September, 2026

    55.9 °F

  • Average September

    77.8 °F

  • Highest 1 September, 2026

    98.7 °F

Climate (2021–2026)

Kirksville, Kirksville Regional Airport (20.5 miles)

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  • Average Low 2021–2026

    43.1 °F

  • Average 2021–2026

    54 °F

  • Average High 2021–2026

    65 °F
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