Winthrop Weather Forecast

    • 58
    • 74

    Mostly Cloudy

    • 66
    • 76

    Rain Showers

    • 52
    • 75

    Partly Sunny

    • 51
    • 68

    Mostly Sunny

    • 60
    • 77

    Partly Sunny

    • 55
    • 76

    Chance Rain Showers

Today 8 Sep Northern St. Lawrence

Partly sunny. A slight chance of Showers in the morning. Highs in the mid 70s. Light and variable Winds. Chance of rain 20 percent.

Tonight 8 Sep Northern St. Lawrence

Mostly cloudy. Lows in the upper 50s. Light and variable Winds.

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Winthrop Temperature Statistics

September Temperature

Massena, Massena International-Richards Field (9.9 miles)

  • Lowest 5 September, 2026

    55 °F

  • Average September

    68.2 °F

  • Highest 2 September, 2026

    81.6 °F

Climate (2021–2026)

Massena, Massena International-Richards Field (9.9 miles)

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  • Average Low 2021–2026

    36 °F

  • Average 2021–2026

    46.2 °F

  • Average High 2021–2026

    55.9 °F
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