Seymour Weather Forecast

    • 32
    • 39

    Increasing Clouds

    • 23
    • 45

    Partly Sunny

    • 25
    • 36

    Rain/Snow Likely

    • 31
    • 43

    Chance Rain/Snow

    • 26
    • 42

    Mostly Cloudy

    • 36
    • 46

    Chance Rain

Today 20 Dec Northern New Haven

Mostly sunny. Much cooler with Highs in the upper 30s. West Winds around 5 Mph.

Tonight 20 Dec Northern New Haven

Partly cloudy in the Evening, then becoming mostly cloudy. Lows around 30. Southwest Winds 5 to 10 Mph. Gusts up to 20 Mph after midnight.

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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

    27.9 °F

  • Highest 18 December, 2025

    45 °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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