Belleville Weather Forecast

    • 33
    • 59

    Slight Chance Rain Showers

    • 32
    • 48

    Mostly Sunny

    • 47
    • 58

    Partly Sunny

    • 51
    • 65

    Chance Rain Showers

    • 46
    • 60

    Partly Sunny

    • 49
    • 62

    Mostly Cloudy

Today 26 Oct Jefferson

Mostly cloudy with a 50 percent chance of Showers. Highs in the upper 50s. Light Winds.

Tonight 26 Oct Jefferson

Partly cloudy in the Evening, then becoming mainly clear. Colder with Lows Ranging from the upper 20s across the tug hill to the mid 30s along the lake Ontario shore. North Winds 5 to 10 Mph, becoming light.

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Belleville Temperature Statistics

October Temperature

Watertown, Watertown International Airport (14.9 miles)

  • Lowest 21 October, 2026

    26.1 °F

  • Average October

    51 °F

  • Highest 1 October, 2026

    71.7 °F

Climate (2021–2026)

Watertown, Watertown International Airport (14.9 miles)

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  • Average Low 2021–2026

    38.1 °F

  • Average 2021–2026

    48.1 °F

  • Average High 2021–2026

    57.5 °F
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