Merrimack Weather Forecast

    • 52
    • 71

    Mostly Sunny

    • 55
    • 78

    Partly Sunny

    • 54
    • 79

    Partly Sunny

    • 65
    • 77

    Mostly Cloudy

Today 6 Sep Eastern Hillsborough

Partly sunny with isolated Showers. Highs in the lower 70s. Light and variable Winds. Chance of rain 20 percent.

Tonight 6 Sep Eastern Hillsborough

Mostly clear. Isolated Showers in the evening. Lows in the lower 50s. Light and variable Winds. Chance of rain 20 percent.

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Merrimack Temperature Statistics

September Temperature

Manchester Airport (5 miles)

  • Lowest 1 September, 2026

    61.6 °F

  • Average September

    69.3 °F

  • Highest 4 September, 2026

    84 °F

Climate (2021–2026)

Manchester Airport (5 miles)

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  • Average Low 2021–2026

    41.9 °F

  • Average 2021–2026

    52 °F

  • Average High 2021–2026

    61.9 °F
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