Greenville Weather Forecast

    • 63
    • 73

    Rain Showers Likely

    • 51
    • 73

    Rain Showers

    • 51
    • 68

    Slight Chance Rain Showers

    • 51
    • 65

    Rain Showers Likely

    • 50
    • 63

    Chance Rain Showers

    • 49
    • 65

    Slight Chance Rain Showers

    • 49
    • 69

    Partly Sunny

Today 19 Sep Mercer

Mostly sunny. Highs around 70.

Tonight 19 Sep Mercer

Showers likely with a slight chance of Thunderstorms. Lows in the lower 60s. Southeast 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

    68.7 °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

    59.2 °F
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