New Haven weather in September 2025

Expect 23°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in New Haven in September. Check more long-term weather averages for New Haven in September before you book your next holiday to Connecticut in 2025/2026.

• 23
  23°C max day temperature
• 7
  7 hours of sunshine per day
• 8
  8 days with some rainfall
• 13
  13°C min night temperature
• 12
  12 hours of daylight per day
• 0
  No heat & humidity
• 85
  85 mm of monthly rainfall
• 6
  6 (High) UV index
• 21
  21°C sea temperature

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The September weather guide for Connecticut (New Haven) 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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More about the USA

New Haven September sunrise & sunset times

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

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