New Haven Weather in August

What's the weather like in New Haven (Connecticut) in August 2025?

The climate in New Haven during August can be summarized as warm, humid and a little damp.

August is in the summer in New Haven and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 27°C (80°F), whilst at night 17°C (63°F) is normal.

New Haven weather averages (imperial / metric)
Daytime temperature 26.9°C 80.3°F
Nightly temperature 17°C 62.5°F
Average temperature 21.9°C 71.4°F
Daily sunshine 9.1 hrs
Avg rainfall 93 mm 3.7 ins
Rainy days 9 days
Sea temperature 21.7°C 71°F
Humidity 74%
Windspeed 14.8kph 9 mph

On average August is the 5th wettest month of the year in New Haven with around 93mm 3.7 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.1 hours of sunshine per day.

August temperatures in New Haven

New Haven average temperature in August

August rainfall

New Haven average rain in August

August hourly sunshine

New Haven average rain in August

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in New Haven in August 2025.

Other monthly averages

Best places to visit in August

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

New Haven weather stats

New Haven weather statistics
Hottest month: July 27.2°C 81°F
Driest month: June 76mm 3ins
Sunniest month: August 9.1hrs
Coldest month: January 1.8°C 35.2°F
Wettest month: November 103mm 4.1ins
Map showing location of New Haven (41.30815, -72.92816) New Haven map pin © Google

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