Lake Ontario Weather Forecast

    • 61
    • 68

    Chance Rain Showers

    • 59
    • 65

    Chance Rain Showers

    • 59
    • 65

    Partly Sunny

    • 56
    • 66

    Chance Rain Showers

    • 56
    • 63

    Slight Chance Rain Showers

    • 59
    • 65

    Partly Sunny

Today 25 Aug Oswego

Partly sunny. Highs Ranging from the mid 60s on the tug hill to the lower 70s across the lower Elevations. West Winds 10 to 15 Mph.

Tonight 25 Aug Oswego

Partly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly cloudy with a chance of Showers overnight. Lows Ranging from the lower 50s across the tug hill to the upper 50s along the lake Ontario shore. West Winds 10 to 15 Mph, becoming light. Chance of rain 40 percent.

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Lake Ontario Temperature Statistics

August Temperature

Fulton, Oswego County Airport (18 miles)

  • Lowest 2 August, 2025

    47.6 °F

  • Average August

    70.4 °F

  • Highest 12 August, 2025

    95.6 °F

Climate (2020–Present)

Fulton, Oswego County Airport (18 miles)

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  • Average Low 2020–2025

    41.2 °F

  • Average 2020–2025

    49.8 °F

  • Average High 2020–2025

    58.4 °F
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