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
  20°C max day temperature
• 7
  7 hours of sunshine per day
• 10
  10 days with some rainfall
• 7
  7°C min night temperature
• 12
  12 hours of daylight per day
• 0
  No heat & humidity
• 89
  89 mm of monthly rainfall
• 6
  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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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.

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