Winthrop Weather Forecast

    • 45
    • 65

    Becoming Sunny

    • 60
    • 72

    Mostly Cloudy

    • 56
    • 74

    Mostly Cloudy

    • 41
    • 67

    Slight Chance Rain Showers

    • 43
    • 65

    Partly Sunny

    • 41
    • 66

    Chance Rain Showers

Today 29 Sep Northern St. Lawrence

Cloudy this Morning, then becoming partly sunny. Highs in the mid 60s. Light and variable Winds.

Tonight 29 Sep Northern St. Lawrence

Clear until Midnight, then becoming partly cloudy. Lows in the mid 40s. Light and variable Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Winthrop Temperature Statistics

September Temperature

Massena, Massena International-Richards Field (9.9 miles)

  • Lowest 24 September, 2026

    34.6 °F

  • Average September

    60.5 °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

    46.1 °F

  • Average High 2021–2026

    55.9 °F
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