Seymour Weather Forecast

    • 16
    • 27

    Mostly Sunny

    • 31
    • 39

    Rain/Freezing Rain

    • 23
    • 50

    Rain

    • 22
    • 31

    Mostly Cloudy

    • 22
    • 35

    Mostly Cloudy

    • 15
    • 33

    Chance Snow

    • 15
    • 29

    Partly Sunny

Today 27 Dec Northern New Haven

Partly sunny. Cold with Highs in the upper 20s. North Winds 5 to 10 Mph.

Tonight 27 Dec Northern New Haven

Mostly clear. Lows around 14. Northwest Winds around 5 Mph.

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Seymour Temperature Statistics

December Temperature

Oxford, Waterbury-Oxford Airport (6.2 miles)

  • Lowest 5 December, 2025

    6.8 °F

  • Average December

    29.4 °F

  • Highest 19 December, 2025

    55.9 °F

Climate (2020–Present)

Oxford, Waterbury-Oxford Airport (6.2 miles)

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  • Average Low 2020–2025

    42.8 °F

  • Average 2020–2025

    51.1 °F

  • Average High 2020–2025

    59.5 °F
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