Mount Sunapee Weather Forecast

    • 50
    • 74

    Increasing Clouds

    • 51
    • 72

    Mostly Cloudy

    • 54
    • 76

    Partly Sunny

    • 41
    • 70

    Mostly Sunny

    • 39
    • 66

    Mostly Sunny

    • 48
    • 71

    Partly Sunny

Today 16 Sep Merrimack

Patchy fog this morning. Partly sunny. Visibility one quarter mile or less at Times this morning. Highs in the mid 70s. Light and variable Winds.

Tonight 16 Sep Merrimack

Partly cloudy. Patchy fog after midnight. Lows in the upper 40s. Light and variable Winds.

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Mount Sunapee Temperature Statistics

September Temperature

Springfield, Hartness State Springfield Airport (22.4 miles)

  • Lowest 9 September, 2025

    37.9 °F

  • Average September

    61.9 °F

  • Highest 4 September, 2025

    82 °F

Climate (2020–Present)

Springfield, Hartness State Springfield Airport (22.4 miles)

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  • Average Low 2020–2025

    38.4 °F

  • Average 2020–2025

    48.4 °F

  • Average High 2020–2025

    58.9 °F
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