Lake Sunapee Weather Forecast

    • 46
    • 63

    Increasing Clouds

    • 47
    • 54

    Rain

    • 42
    • 60

    Mostly Cloudy

    • 43
    • 58

    Partly Sunny

    • 42
    • 59

    Mostly Cloudy

    • 45
    • 58

    Chance Rain Showers

Today 19 Sep Sullivan

Mostly sunny. Highs in the lower 60s. Light and variable Winds.

Tonight 19 Sep Sullivan

Partly cloudy. Lows in the lower 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 15 September, 2026

    42.1 °F

  • Average September

    62.5 °F

  • Highest 10 September, 2026

    82 °F

Climate (2021–2026)

Lebanon Municipal Airport (21.1 miles)

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  • Average Low 2021–2026

    37.8 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    59.7 °F
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