Lake Sunapee Weather Forecast

    • 52
    • 74

    Increasing Clouds

    • 53
    • 71

    Mostly Cloudy

    • 55
    • 76

    Partly Sunny

    • 44
    • 69

    Mostly Sunny

    • 41
    • 65

    Mostly Sunny

    • 51
    • 71

    Partly Sunny

Today 16 Sep Sullivan

Partly sunny. Highs in the upper 70s. Light and variable Winds.

Tonight 16 Sep Sullivan

Partly cloudy in the Evening, then becoming mostly cloudy. Patchy fog after midnight. Lows in the upper 40s. Light and variable Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Sunapee Temperature Statistics

September Temperature

Lebanon Municipal Airport (21.1 miles)

  • Lowest 9 September, 2025

    41 °F

  • Average September

    61.7 °F

  • Highest 3 September, 2025

    82.9 °F

Climate (2020–Present)

Lebanon Municipal Airport (21.1 miles)

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  • Average Low 2020–2025

    38.2 °F

  • Average 2020–2025

    48.9 °F

  • Average High 2020–2025

    59.9 °F
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