Port Jefferson Weather Forecast

    • 56
    • 69

    Mostly Sunny

    • 34
    • 79

    Chance Thunderstorms

    • 29
    • 48

    Partly Sunny

    • 39
    • 55

    Mostly Cloudy

    • 46
    • 60

    Mostly Cloudy

    • 35
    • 70

    Chance Rain

    • 27
    • 48

    Slight Chance Rain

Today 21 Mar Shelby

Sunny. Unseasonably warm with Highs around 70. South Winds 5 to 10 Mph.

Tonight 21 Mar Shelby

Mostly clear. Warmer with Lows in the mid 50s. Southwest Winds 5 to 10 Mph. Gusts up to 25 Mph this late evening and overnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Port Jefferson Temperature Statistics

March Temperature

Bellefontaine Regional Airport (14.3 miles)

  • Lowest 18 March, 2026

    15.8 °F

  • Average March

    40.8 °F

  • Highest 19 March, 2026

    64.4 °F

Climate (2021–Present)

Bellefontaine Regional Airport (14.3 miles)

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  • Average Low 2021–2026

    47.1 °F

  • Average 2021–2026

    55.8 °F

  • Average High 2021–2026

    64.6 °F
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