New Haven weather in August 2025

Expect 27°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in New Haven in August. Check more long-term weather averages for New Haven in August before you book your next holiday to Connecticut in 2025/2026.

  • 27°C maximum daytime temperature in August in New Haven27
    27°C max day temperature
  • 8 hours of sunshine per day
  • 9 days with some rainfall in August in New Haven9
    9 days with some rainfall
  • 17°C minimum night-time temperature in August in New Haven17
    17°C min night temperature
  • 14 hours of daylight per day in August in New Haven14
    14 hours of daylight per day
  • Low heat & humidity in August in New HavenL
    Low heat & humidity
  • 93 mm monthly rainfall in August in New Haven93
    93 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in New Haven8
    8 (Very High) UV index
  • 22°C sea temperature in August in New Haven22
    22°C sea temperature

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The August 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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How hot is it in New Haven in August?

Daytime temperatures usually reach 27°C in New Haven in August with low heat and humidity, falling to 17°C at night.

How sunny is it in New Haven in August?

There are normally 8 hours of bright sunshine each day in New Haven in August - that's 61% of daylight hours.

How warm is the sea around New Haven in August?

The average sea temperature around New Haven in August is 22°C.

Does it rain in New Haven in August?

There are usually 9 days with some rain in New Haven in August and the average monthly rainfall is 93mm.

What is the chance of a hurricane in New Haven in August?

On average less than 1 day in August in New Haven is likely to be affected by the passage of one or more tropical storms.

New Haven August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:47 19:08
Saturday, 16th August 2025 05:02 18:49
Sunday, 31st August 2025 05:17 18:26

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