Greenville Weather Forecast

    • 56
    • 82

    Mostly Sunny

    • 52
    • 79

    Partly Sunny

    • 59
    • 82

    Partly Sunny

    • 61
    • 84

    Mostly Cloudy

    • 60
    • 81

    Chance Rain Showers

    • 58
    • 81

    Chance Rain Showers

Today 18 Sep Mercer

Patchy fog in the morning. Mostly sunny. Highs in the lower 80s. Northwest Winds around 5 Mph.

Tonight 18 Sep Mercer

Mainly clear. Patchy fog after midnight. Lows in the mid 50s. North Winds around 5 Mph in the Evening, becoming light and variable.

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Greenville Temperature Statistics

September Temperature

Port Meadville Airport (17.4 miles)

  • Lowest 8 September, 2025

    46 °F

  • Average September

    62.1 °F

  • Highest 15 September, 2025

    82 °F

Climate (2020–Present)

Port Meadville Airport (17.4 miles)

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  • Average Low 2020–2025

    42.9 °F

  • Average 2020–2025

    51 °F

  • Average High 2020–2025

    59.2 °F
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