Monthly 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
January, like December, in New Haven, Connecticut, is another cold winter month, with average temperature varying between 37.8°F (3.2°C) and 22.3°F (-5.4°C). The coldest month is January, with an average high-temperature of 37.8°F (3.2°C) and an average low-temperature of 22.3°F (-5.4°C). Weather in January »
February, the last month of the winter, in New Haven, is also a cold month, with temperature in the range of an average low of 25°F (-3.9°C) and an average high of 40.5°F (4.7°C). In February, the average high-temperature is 40.5°F (4.7°C), and the average low-temperature is 25°F (-3.9°C). Weather in February »

The first month of the spring, March, is a chilly month in New Haven, Connecticut, with average temperature ranging between min. 31.3°F (-0.4°C) and max. 47.7°F (8.7°C). In New Haven, in March, the average high-temperature is 47.7°F (8.7°C), and the average low-temperature is 31.3°F (-0.4°C). Weather in March »

April in New Haven, Connecticut, is a mild spring month, with temperature in the range of an average low of 40.3°F (4.6°C) and an average high of 58.3°F (14.6°C). In April, the average high-temperature is 58.3°F (14.6°C), and the average low-temperature is 40.3°F (4.6°C). Weather in April »

May, the last month of the spring, in New Haven, is a pleasant month, with average temperature varying between 68.5°F (20.3°C) and 49.3°F (9.6°C). In May, the average high-temperature is 68.5°F (20.3°C), and the average low-temperature is 49.3°F (9.6°C). Weather in May »

June, the first month of the summer, in New Haven, is a warm month, with temperature in the range of an average high of 77.4°F (25.2°C) and an average low of 59.7°F (15.4°C). In New Haven, Connecticut, the average high-temperature is 77.4°F (25.2°C), and the average low-temperature is 59.7°F (15.4°C). Weather in June »

July, the same as June, is another warm summer month in New Haven, Connecticut, with temperature in the range of an average high of 82.6°F (28.1°C) and an average low of 65.5°F (18.6°C). The warmest month is July, with an average high-temperature of 82.6°F (28.1°C) and an average low-temperature of 65.5°F (18.6°C). Weather in July »

The last month of the summer, August, is also a warm month in New Haven, Connecticut, with average temperature ranging between min. 64.9°F (18.3°C) and max. 81°F (27.2°C). In August, the average high-temperature is 81°F (27.2°C), and the average low-temperature is 64.9°F (18.3°C). Weather in August »

September, the first month of the autumn, in New Haven, is still a warm month, with average temperature ranging between min. 56.1°F (13.4°C) and max. 74.5°F (23.6°C). The average high-temperature, is 74.5°F (23.6°C), while the average low-temperature is 56.1°F (13.4°C). Weather in September »

October, like September, in New Haven, Connecticut, is a comfortable autumn month, with average temperature ranging between min. 45°F (7.2°C) and max. 63.3°F (17.4°C). The average high-temperature, in October, is 63.3°F (17.4°C), while the average low-temperature is 45°F (7.2°C). Weather in October »

November, the last month of the autumn, in New Haven, is also a fresh month, with average temperature fluctuating between 53.4°F (11.9°C) and 36.7°F (2.6°C). The average high-temperature, is 53.4°F (11.9°C), while the average low-temperature is 36.7°F (2.6°C). Weather in November »

The first month of the winter, December, is still a chilly month in New Haven, Connecticut, with temperature in the range of an average low of 28.4°F (-2°C) and an average high of 43°F (6.1°C). In New Haven, Connecticut, the average high-temperature is 43°F (6.1°C), and the average low-temperature is 28.4°F (-2°C). Weather in December »

What is the coldest month in New Haven?

January is the coldest month, with an average high-temperature of 37.8°F (3.2°C) and an average low-temperature of 22.3°F (-5.4°C).

How much does it rain in New Haven?

In New Haven, during the entire year, the rain falls for 119 days and collects up to 47.1" (1196.6mm) of precipitation.

What is the driest month in New Haven?

The month with the least rainfall is February when the rain falls for 10 days and typically collects 2.9" (73.4mm) of precipitation.

What month is the ocean coldest in New Haven?

February is the month with the coldest seawater in New Haven, with an average ocean temperature of 38.5°F (3.6°C). For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

What is the rainiest month in New Haven?

The month with the most rainfall is April when the rain falls for 10 days and typically aggregates up to 4.4" (112.8mm) of precipitation.

What is the month with the most sunshine in New Haven?

Months with the most sunshine in New Haven, Connecticut, are May through July, with an average of 9h of sunshine.

When are the longest days in New Haven?

With an average of 15.1h of daylight, June has the longest days of the year.

When is the highest UV index in New Haven?

June through August, with an average UV index of 8, are months with the highest UV index.

What is the warmest month in New Haven?

With an average high-temperature of 82.6°F (28.1°C) and an average low-temperature of 65.5°F (18.6°C), July is the warmest month in New Haven, Connecticut.

What is the month with the warmest ocean in New Haven?

August is the month with the warmest seawater, with an average ocean temperature of 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. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

What is the month with the least sunshine in New Haven?

November and December, with an average of 5h of sunshine, are months with the least sunshine in New Haven.

What is the month with the shortest days in New Haven?

The month with the shortest days in New Haven, Connecticut, is December, with an average of 9.2h of daylight.

When is the lowest UV index in New Haven?

The month with the lowest UV index in New Haven is December, with an average UV index of 1.
Average temperature - New Haven, CT
Average rainfall - New Haven, CT
Average rainfall days - New Haven, CT
Average sea temperature - New Haven, CT

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 / Average sunshine - New Haven, CT
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