New Haven
Connecticut, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
New Haven, CT

A scenic shot from above of the greeny New Haven Green in Connecticut, with the rest of the city and a far away dramatic landscape
A scenic shot from above of the greeny New Haven Green in Connecticut, with the rest of the city and a far away dramatic landscape
August, the last month of the summer, in New Haven, is another warm month, with temperature in the range of an average low of 64.9°F (18.3°C) and an average high of 81°F (27.2°C).

Temperature

In August, the average high-temperature is almost the same as in July - a still warm 81°F (27.2°C). In August, the average low-temperature is 64.9°F (18.3°C).

Rainfall

In New Haven, in August, it is raining for 9 days, with typically 3.9" (100.3mm) of accumulated precipitation. In New Haven, during the entire year, the rain falls for 119 days and collects up to 47.1" (1196.6mm) of precipitation.

Ocean temperature

With an average ocean temperature of 73°F (22.8°C), August is the month with the warmest seawater in New Haven, Connecticut. Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 73°F (22.8°C) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 77°F (25°C) to 82.4°F (28°C).)

Daylight

In August, the average length of the day in New Haven, Connecticut, is 13.8h.

Sunshine

The average sunshine in August is 8h.

UV index

June through August, with an average maximum UV index of 8, are months with the highest UV index in New Haven, Connecticut. A UV Index value of 8 to 10 symbolizes a very high health risk from unprotected exposure to the Sun's UV rays for average individuals.
The average daily UV index of 8 transform into the following instructions:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in August in New Haven?

In August, in New Haven, the average high-temperature is 81°F (27.2°C), and the average low-temperature is 64.9°F (18.3°C).

How much does it rain in New Haven in August?

In New Haven, Connecticut, in August, during 9 rainfall days, 3.9" (100.3mm) of precipitation is typically accumulated.

When is the ocean warmest in New Haven?

August is the month with the warmest seawater in New Haven, with an average ocean temperature of 73°F (22.8°C). For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 73°F (22.8°C).

How warm is the water in August in New Haven?

In New Haven, the average seawater temperature in August is 73°F (22.8°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 73°F (22.8°C) water.

How many hours of daylight does New Haven have in August?

In New Haven, the average length of the day in August is 13.8h.

How long on average sun shines in August in New Haven?

In August, the average sunshine in New Haven, Connecticut, is 8h.

What is the month with the highest UV index in New Haven?

June through August, with an average maximum UV index of 8, are months with the highest UV index in New Haven, Connecticut.

How high is the UV index in August in New Haven?

In New Haven, the average daily maximum UV index in August is 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from the exposure to the Sun's UV rays.
Average temperature in August - New Haven, CT
  • Average high temperature in August: 80.9°F

The warmest month (with the highest average high temperature) is July (82.5°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in August: 64.9°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (22.2°F).

Average rainfall in August - New Haven, CT
  • Average rainfall in August: 4"

Wettest months (with the highest rainfall) are April and September (4.4").
The driest month (with the lowest rainfall) is February (2.9").

Average rainfall days in August - New Haven, CT
  • Average rainfall days in August: 9 days

The month with the highest number of rainy days is December (12 days).
The month with the lowest number of rainy days is October (7 days).

Average sea temperature in August - New Haven, CT
  • Average sea temperature in August: 73°F

The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is February (38.5°F).

Average daylight in August / Average sunshine in August - New Haven, CT
  • Average daylight in August: 13.8h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.2h).

  • Average sunshine in August: 8h

Months with most sunshine are May, June and July (Average sunshine: 9h).
Months with least sunshine are November and December (Average sunshine: 5).

Average UV index in August - New Haven, CT
  • Average UV index in August: 8

Months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 1).