New Haven weather in August 2025

Q: 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.

Q: 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.

Q: How warm is the sea around New Haven in August?

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

Q: 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.

Q: What is the chance of a cyclone 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.

Expect 81°F 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.

81
81°F max day temperature
8
8 hours of sunshine per day
9
9 days with some rainfall
63
63°F min night temperature
14
14 hours of daylight per day
L
Low heat & humidity
3.7
3.7 inches of monthly rainfall
8
8 (Very High) UV index
72
72°F 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) | Imperial (°F)

More about the USA

How hot is it in New Haven in August?

Daytime temperatures usually reach 81°F in New Haven in August with low heat and humidity, falling to 63°F 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 72°F.

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 3.7 inches.

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.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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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Connecticut - quick facts
Flight time^✝	10.5 hours
Time difference	UK -5 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Tourist info	Connecticut Office of Tourism