- Book early & save on 2025 river cruises with Avalon Waterways
- Filter deals by promotion, month, destination & more
- Travel between 1st Jan & 31st Dec 2025 (inclusive)
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°C max day temperature
23 - 7 hours of sunshine per day
- 8 days with some rainfall
8 - 13°C min night temperature
13 - 12 hours of daylight per day
12 - No heat & humidity
0 - 85 mm of monthly rainfall
85 - 6 (High) UV index
6 - 21°C sea temperature
21
More about New Haven
- Overview
- Best time to visit
- Weather by month
- 5-day weather forecast
- Destinations
- Travel advice
- Deals & discounts
New Haven by month
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Recommended for Connecticut
Expires at 23:59 on Wednesday 31st Dec 2025 · View all Avalon Waterways offers
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 |
Be inspired
Get your weekly fix of holiday inspiration from some of the world's best travel writers plus save on your next trip with the latest exclusive offers
We promise not to share your details
Related posts
Popular travel offers
Explore holidays in the sun for less
- Beach holidays
- Family holidays
- City breaks
- Summer holidays
- Winter sun holidays
- Holiday offers
- Top travel brands
- Airlines & flights
- Discount hotels
- Airport parking deals
- TUI
- Jet2holidays
- easyJet holidays
- Love Holidays
- Boxing Day sales
Airport parking
- Manchester Airport
- Stansted Airport
- Bristol Airport
- Luton Airport
- Birmingham Airport
- Edinburgh Airport
- Gatwick Airport
- Glasgow Airport
- Newcastle Airport
Airport lounges
- Manchester Airport
- Birmingham Airport
- Bristol Airport
- Edinburgh Airport
- Glasgow Airport
- Heathrow Airport
- Newcastle Airport
- Stansted Airport
- Gatwick Airport