Winthrop Weather Forecast

    • 61
    • 71

    Chance Rain Showers

    • 54
    • 75

    Mostly Cloudy

    • 54
    • 72

    Chance Rain Showers

    • 49
    • 70

    Partly Sunny

    • 52
    • 67

    Chance Rain Showers

    • 49
    • 67

    Chance Rain Showers

Today 15 Sep Northern St. Lawrence

Partly sunny in the Morning, then becoming mostly cloudy. Highs around 70. Light and variable Winds, becoming south around 10 Mph in the afternoon.

Tonight 15 Sep Northern St. Lawrence

Mostly cloudy with a 40 percent chance of Showers. Lows in the lower 60s. South Winds around 10 Mph.

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Winthrop Temperature Statistics

September Temperature

Massena, Massena International-Richards Field (9.9 miles)

  • Lowest 12 September, 2026

    45 °F

  • Average September

    65.3 °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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