Winthrop Weather Forecast

    • 22
    • 33

    Mostly Cloudy

    • 17
    • 34

    Mostly Cloudy

    • 25
    • 36

    Slight Chance Snow

    • 22
    • 37

    Chance Rain/Snow

    • 20
    • 43

    Rain Showers Likely

    • 10
    • 28

    Partly Sunny

    • 22
    • 32

    Mostly Cloudy

Today 22 Mar Northern St. Lawrence

Freezing Rain, snow and sleet through late Morning, then a chance of snow or freezing rain and sleet this afternoon. Snow and sleet accumulation around an inch. Additional ice accumulation around a trace. Highs in the lower 30s. Northeast Winds around 10 Mph. Chance of precipitation near 100 percent.

Tonight 22 Mar Northern St. Lawrence

Mostly cloudy with a slight chance of freezing drizzle. Lows in the lower 20s. Northeast Winds around 10 Mph until Midnight, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Winthrop Temperature Statistics

March Temperature

Massena, Massena International-Richards Field (9.9 miles)

  • Lowest 2 March, 2026

    -15.4 °F

  • Average March

    30.1 °F

  • Highest 16 March, 2026

    68.6 °F

Climate (2021–Present)

Massena, Massena International-Richards Field (9.9 miles)

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  • Average Low 2021–2026

    36.2 °F

  • Average 2021–2026

    46.3 °F

  • Average High 2021–2026

    55.9 °F
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