Greenville Weather Forecast

    • 64
    • 77

    Chance Thunderstorms

    • 55
    • 79

    Slight Chance Rain Showers

    • 54
    • 78

    Mostly Sunny

    • 55
    • 79

    Mostly Sunny

    • 63
    • 81

    Mostly Cloudy

    • 66
    • 86

    Chance Rain Showers

    • 56
    • 78

    Slight Chance Thunderstorms

Today 4 Sep Mercer

Mostly cloudy with a chance of Showers and Thunderstorms. Near steady temperature in the mid 70s. West Winds around 5 Mph. Chance of rain 50 percent.

Tonight 4 Sep Mercer

Mostly cloudy. A chance of Showers and Thunderstorms, mainly this evening. Patchy fog this Evening, then Areas of fog after midnight. Warm with Lows in the mid 60s. Northwest Winds around 5 Mph this Evening, becoming light and variable. Chance of rain 30 percent.

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Greenville Temperature Statistics

September Temperature

Port Meadville Airport (17.4 miles)

  • Lowest 2 September, 2026

    69.1 °F

  • Average September

    75.3 °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

    42.6 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    59.2 °F
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