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

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

• Titan Travel^*
• Love Holidays^*
• Saga Holidays^*
• Cosmos^*

Zest Car Rental: up to 30% off car hire worldwide

Sale

• Save up to 30% on car hire in Black Friday sale
• Discount varies by country & travel period
• Browse exclusive car hire company offers

Go to Zest Car Rental deal >>

Expires at 00:00 on Monday 1st Dec 2025 · View all Zest Car Rental 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)

Back to top

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.

JanFebMarAprMayJunJulAugSepOctNovDec

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
• Black Friday sales

More holidays

Airport parking

• Manchester Airport
• Stansted Airport
• Bristol Airport
• Luton Airport
• Birmingham Airport
• Edinburgh Airport
• Gatwick Airport
• Glasgow Airport
• Newcastle Airport

More parking

Airport lounges

• Manchester Airport
• Birmingham Airport
• Bristol Airport
• Edinburgh Airport
• Glasgow Airport
• Heathrow Airport
• Newcastle Airport
• Stansted Airport
• Gatwick Airport

More lounges

Top ^