Lake Sunapee weather in September 2025

Expect 20°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Lake Sunapee in September. Check more long-term weather averages for Lake Sunapee in September before you book your next holiday to New Hampshire in 2025/2026.

  • 20°C maximum daytime temperature in September in Lake Sunapee20
    20°C max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in September in Lake Sunapee10
    10 days with some rainfall
  • 7°C minimum night-time temperature in September in Lake Sunapee7
    7°C min night temperature
  • 12 hours of daylight per day in September in Lake Sunapee12
    12 hours of daylight per day
  • No heat & humidity in September in Lake Sunapee0
    No heat & humidity
  • 89 mm monthly rainfall in September in Lake Sunapee89
    89 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Lake Sunapee6
    6 (High) UV index

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Lake Sunapee by month

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The September weather guide for New Hampshire (Lake Sunapee) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Lake Sunapee in September?

Daytime temperatures usually reach 20°C in Lake Sunapee in September, falling to 7°C at night.

How sunny is it in Lake Sunapee in September?

There are normally 7 hours of bright sunshine each day in Lake Sunapee in September - that's 53% of daylight hours.

Does it rain in Lake Sunapee in September?

There are usually 10 days with some rain in Lake Sunapee in September and the average monthly rainfall is 89mm.

What is the chance of a hurricane in Lake Sunapee in September?

On average less than 1 day in September in Lake Sunapee is likely to be affected by the passage of one or more tropical storms.

Lake Sunapee September sunrise & sunset times

Browse the sunrise and sunset times for Lake Sunapee in September 2025. Select a month to view Lake Sunapee sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:13 18:23
Monday, 15th September 2025 05:28 17:58
Tuesday, 30th September 2025 05:45 17:31

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