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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.
- 2323°C max day temperature
- 7 hours of sunshine per day
- 88 days with some rainfall
- 1313°C min night temperature
- 1212 hours of daylight per day
- 0No heat & humidity
- 8585 mm of monthly rainfall
- 66 (High) UV index
- 2121°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)
More about the USA
How hot is it in New Haven in September?
Daytime temperatures usually reach 23°C in New Haven in September, falling to 13°C at night.
How sunny is it in New Haven in September?
There are normally 7 hours of bright sunshine each day in New Haven in September - that's 60% of daylight hours.
How warm is the sea around New Haven in September?
The average sea temperature around New Haven in September is 21°C.
Does it rain in New Haven in September?
There are usually 8 days with some rain in New Haven in September and the average monthly rainfall is 85mm.
What is the chance of a hurricane in New Haven in September?
On average less than 1 day in September in New Haven is likely to be affected by the passage of one or more tropical storms.
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:18 | 18:24 |
Monday, 15th September 2025 | 05:32 | 18:00 |
Tuesday, 30th September 2025 | 05:48 | 17:35 |
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