New Haven weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Excellent
Best time to visit: July – August
What is the weather like in New Haven in August?
In August, New Haven is warm: daytime highs average 26 °C, and nights cool down to about 20 °C. The sea averages 23.2 °C – pleasant for swimming. The sun shines for around 8 hours a day. Rain is frequent, with about 10 rainy days and 92 mm in total. The air is often humid and muggy. All in all, August is an excellent month for a holiday in New Haven.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 83 | 84 | 64 |
| Day | 27° | 26° | 23° |
| Night | 20° | 20° | 17° |
| Sea | 22° | 23° | 22° |
| Sun | 8 h | 8 h | 6 h |
| Rain days | 10 | 10 | 9 |
More details for August
- Daylight
- 13 h 53 min06:00 – 19:53
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 15 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 52 %on averageAll months
- Hot days
- 3 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %89 %
- Sunshineweight 20 %77 %
- Few rainy daysweight 20 %60 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in August
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
New Haven in August: quick answers
Is New Haven hot in August?
Warm rather than hot: in August, daytime highs in New Haven average 26 °C and nights cool to about 20 °C. On about 3 days the thermometer climbs to 30 °C or more.
Can you swim in New Haven in August?
Yes. In August the sea averages 23.2 °C – pleasant for swimming.
Does it rain much in New Haven in August?
Rain is frequent, with about 10 rainy days and 92 mm in total.
New Haven month by month
The whole year in New HavenAll destinations: USAWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences