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

May 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
The last month of the spring, May, is an agreeable month in New Haven, Connecticut, with temperature in the range of an average low of 49.3°F (9.6°C) and an average high of 68.5°F (20.3°C).

Temperature

In New Haven, Connecticut, the average high-temperature increases, from a mild 58.3°F (14.6°C) in April, to an agreeable 68.5°F (20.3°C). In May, in New Haven, the average low-temperature is 49.3°F (9.6°C).

Rainfall

In New Haven, in May, during 11 rainfall days, 4.2" (105.9mm) of precipitation is typically accumulated. Throughout the year, there are 119 rainfall days, and 47.1" (1196.6mm) of precipitation is accumulated.

Ocean temperature

In May, the average ocean temperature in New Haven is 52.2°F (11.2°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

In New Haven, Connecticut, the average length of the day is 14.5h.

Sunshine

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

UV index

In New Haven, Connecticut, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the UV radiation for the average person.
The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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.

What is the temperature in May in New Haven?

In New Haven, Connecticut, 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).

How much does it rain in New Haven in May?

In May, the rain falls for 11 days. Throughout May, 4.2" (105.9mm) of precipitation is accumulated.

How cold is the water in May in New Haven?

In New Haven, Connecticut, in May, the average water temperature is 52.2°F (11.2°C). Swimming in 52.2°F (11.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

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

The average length of the day in May in New Haven is 14.5h.

What are the months with the most sunshine in New Haven?

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

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

In May, the average sunshine is 9h.

What is the UV index intensity in May in New Haven?

In May, the average daily maximum UV index in New Haven, Connecticut, is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in May - New Haven, CT
  • Average high temperature in May: 68.5°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 May: 49.3°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 May - New Haven, CT
  • Average rainfall in May: 4.2"

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 May - New Haven, CT
  • Average rainfall days in May: 11 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 May - New Haven, CT
  • Average sea temperature in May: 52.2°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 May / Average sunshine in May - New Haven, CT
  • Average daylight in May: 14.5h

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 May: 9h

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 May - New Haven, CT
  • Average UV index in May: 7

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).