Three Mills County Park Weather Forecast

    • 52
    • 76

    Decreasing Clouds

    • 52
    • 73

    Mostly Sunny

    • 65
    • 81

    Chance Rain Showers

    • 58
    • 79

    Chance Rain Showers

    • 60
    • 73

    Partly Sunny

    • 60
    • 84

    Rain Showers Likely

Today 10 Sep Ontario

Partly to mostly sunny. Highs Ranging from around 70 on the Hilltops to the mid 70s across the lower Elevations. West Winds 10 to 15 Mph, becoming northwest.

Tonight 10 Sep Ontario

Mostly cloudy in the Evening, then clearing. Cooler with Lows in the lower 50s. Northwest Winds 10 Mph or less.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Three Mills County Park Temperature Statistics

September Temperature

Penn Yan, Penn Yan Airport (23.6 miles)

  • Lowest 6 September, 2026

    51.1 °F

  • Average September

    68.5 °F

  • Highest 1 September, 2026

    82.9 °F

Climate (2021–2026)

Penn Yan, Penn Yan Airport (23.6 miles)

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  • Average Low 2021–2026

    41.7 °F

  • Average 2021–2026

    50.3 °F

  • Average High 2021–2026

    59 °F
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