Winthrop Weather Forecast

    • 64
    • 84

    Chance Rain Showers

    • 60
    • 84

    Rain Showers Likely

    • 40
    • 70

    Slight Chance Rain Showers

    • 40
    • 57

    Mostly Sunny

    • 45
    • 65

    Chance Rain Showers

    • 47
    • 66

    Chance Rain Showers

Today 18 May Northern St. Lawrence

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms this Morning, then sunny this afternoon. Highs in the mid 80s. Light and variable Winds, becoming southwest around 10 Mph with Gusts up to 25 Mph this afternoon. Chance of rain 40 percent.

Tonight 18 May Northern St. Lawrence

Clear until Midnight, then becoming partly cloudy. A 20 percent chance of Showers. Lows in the mid 60s. Southwest Winds around 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Winthrop Temperature Statistics

May Temperature

Massena, Massena International-Richards Field (9.9 miles)

  • Lowest 9 May, 2026

    30.7 °F

  • Average May

    49.9 °F

  • Highest 5 May, 2026

    72.6 °F

Climate (2021–Present)

Massena, Massena International-Richards Field (9.9 miles)

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  • Average Low 2021–2026

    36.1 °F

  • Average 2021–2026

    46.1 °F

  • Average High 2021–2026

    55.8 °F
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