Greenville Weather Forecast

    • 64
    • 80

    Rain Showers

    • 55
    • 80

    Chance Rain Showers

    • 50
    • 70

    Partly Sunny

    • 63
    • 79

    Chance Rain Showers

    • 65
    • 83

    Rain Showers Likely

    • 60
    • 81

    Rain Showers Likely

Today 12 Sep Mercer

Showers with a chance of Thunderstorms this afternoon. Some Thunderstorms may produce heavy rainfall this afternoon. Highs around 80. Southeast Winds 5 to 10 Mph, becoming southwest this afternoon. Chance of rain near 100 percent.

Tonight 12 Sep Mercer

Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall. Warm with Lows in the mid 60s. South Winds around 5 Mph. Chance of rain 70 percent.

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Greenville Temperature Statistics

September Temperature

Port Meadville Airport (17.4 miles)

  • Lowest 7 September, 2026

    52 °F

  • Average September

    69.9 °F

  • Highest 2 September, 2026

    87.1 °F

Climate (2021–2026)

Port Meadville Airport (17.4 miles)

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  • Average Low 2021–2026

    42.7 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    59.3 °F
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