Greenville Weather Forecast

    • 64
    • 79

    Rain Showers

    • 67
    • 82

    Thunderstorms

    • 61
    • 80

    Rain Showers Likely

    • 57
    • 76

    Partly Sunny

    • 64
    • 79

    Rain Showers Likely

    • 59
    • 77

    Chance Rain Showers

Today 15 Sep Mercer

Mostly sunny. Near steady temperature in the upper 70s. South Winds 10 to 15 Mph.

Tonight 15 Sep Mercer

Mainly clear. Isolated Showers after midnight. Warm with Lows in the mid 60s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Greenville Temperature Statistics

September Temperature

Port Meadville Airport (17.4 miles)

  • Lowest 7 September, 2026

    52 °F

  • Average September

    69.3 °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

    42.7 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    59.3 °F
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