Merrimack Weather Forecast

    • 3
    • 25

    Mostly Sunny

    • 18
    • 27

    Chance Snow

    • 27
    • 40

    Rain

    • 18
    • 36

    Mostly Cloudy

    • 15
    • 33

    Chance Snow

    • 14
    • 31

    Chance Snow

Today 8 Dec Eastern Hillsborough

Mostly sunny. Highs in the lower 20s. Northwest Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 8 Dec Eastern Hillsborough

Mostly clear. Lows around 16. Northwest Winds 10 to 15 Mph with Gusts up to 30 Mph.

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Merrimack Temperature Statistics

December Temperature

Manchester Airport (5 miles)

  • Lowest 5 December, 2025

    5 °F

  • Average December

    25.9 °F

  • Highest 1 December, 2025

    39.9 °F

Climate (2020–Present)

Manchester Airport (5 miles)

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  • Average Low 2020–2025

    42.7 °F

  • Average 2020–2025

    52.4 °F

  • Average High 2020–2025

    62 °F
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