Belleville Weather Forecast

    • 74
    • 89

    Slight Chance Thunderstorms

    • 68
    • 86

    Partly Sunny

    • 62
    • 83

    Partly Sunny

    • 62
    • 80

    Chance Rain Showers

    • 61
    • 80

    Chance Thunderstorms

    • 61
    • 80

    Chance Thunderstorms

Today 14 Jul Jefferson

Mostly sunny and Breezy, hot with Highs Ranging from the mid 80s along the lake Ontario shore to around 90 inland. Southwest Winds 10 to 20 Mph with Gusts up to 35 Mph. Heat index Values in the upper 90s.

Tonight 14 Jul Jefferson

Mainly clear in the Evening, then partly cloudy with a chance of Showers and Thunderstorms overnight. Breezy. Very warm and muggy with Lows in the lower 70s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph in the Evening, becoming light. Chance of rain 30 percent.

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Belleville Temperature Statistics

July Temperature

Watertown, Watertown International Airport (14.9 miles)

  • Lowest 5 July, 2026

    54.6 °F

  • Average July

    73.3 °F

  • Highest 1 July, 2026

    91.7 °F

Climate (2021–2026)

Watertown, Watertown International Airport (14.9 miles)

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  • Average Low 2021–2026

    38.3 °F

  • Average 2021–2026

    48.3 °F

  • Average High 2021–2026

    57.5 °F
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