Grindstone Weather Forecast

    • 58
    • 73

    Decreasing Clouds

    • 48
    • 67

    Mostly Sunny

    • 53
    • 63

    Mostly Cloudy

    • 49
    • 63

    Partly Sunny

    • 49
    • 61

    Mostly Cloudy

    • 51
    • 64

    Mostly Cloudy

Today 17 Sep Jefferson

Mostly cloudy Early, then becoming partly sunny. Highs Ranging from the lower 70s on the tug hill to the mid 70s across the lower Elevations. Light Winds.

Tonight 17 Sep Jefferson

Becoming mainly clear with some patchy fog developing overnight. Lows Ranging from the lower 50s across the tug hill to the upper 50s along the lake Ontario shore. Light north Winds.

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Grindstone Temperature Statistics

September Temperature

Watertown, Watertown International Airport (20.5 miles)

  • Lowest 12 September, 2026

    42.7 °F

  • Average September

    65.3 °F

  • Highest 2 September, 2026

    83.6 °F

Climate (2021–2026)

Watertown, Watertown International Airport (20.5 miles)

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  • Average Low 2021–2026

    38.2 °F

  • Average 2021–2026

    48.2 °F

  • Average High 2021–2026

    57.6 °F
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