Grindstone Weather Forecast

    • 44
    • 61

    Increasing Clouds

    • 44
    • 57

    Mostly Sunny

    • 48
    • 62

    Mostly Cloudy

    • 48
    • 59

    Rain Showers Likely

    • 51
    • 61

    Rain Showers Likely

    • 51
    • 63

    Slight Chance Rain Showers

Today 20 May Jefferson

Mostly cloudy Early, then becoming mostly sunny. Highs Ranging from the upper 50s on the tug hill to the mid 60s across the lower Elevations. West Winds 5 to 10 Mph, increasing to 10 to 15 Mph.

Tonight 20 May Jefferson

Partly to mostly cloudy. Cooler with Lows Ranging from the lower 40s across the tug hill to the mid 40s along the lake Ontario shore. West Winds 5 to 10 Mph, becoming north.

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  • Temperature Real-Time

Grindstone Temperature Statistics

May Temperature

Watertown, Watertown International Airport (20.5 miles)

  • Lowest 1 May, 2026

    29.6 °F

  • Average May

    51 °F

  • Highest 18 May, 2026

    87.1 °F

Climate (2021–Present)

Watertown, Watertown International Airport (20.5 miles)

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  • Average Low 2021–2026

    38.4 °F

  • Average 2021–2026

    48.3 °F

  • Average High 2021–2026

    57.6 °F
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