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

October 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
October, like September, in New Haven, Connecticut, is another enjoyable autumn month, with average temperature fluctuating between 63.3°F (17.4°C) and 45°F (7.2°C).

Temperature

In October, the average high-temperature decreases, from a warm 74.5°F (23.6°C) in September, to a comfortable 63.3°F (17.4°C). The average low-temperature, in New Haven, is 45°F (7.2°C).

Rainfall

In New Haven, it is raining for 7 days, with typically 4.2" (107.7mm) 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

In New Haven, the average seawater temperature in October is 63.1°F (17.3°C). Swimming in 63.1°F (17.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

In October, the average length of the day in New Haven is 11.1h.

Sunshine

In New Haven, the average sunshine in October is 7h.

UV index

In October, the average daily maximum UV index in New Haven is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for average individuals.
The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in October in New Haven?

In October, in New Haven, the average high-temperature is 63.3°F (17.4°C), and the average low-temperature is 45°F (7.2°C).

How much does it rain in New Haven in October?

In New Haven, during October, the rain falls for 7 days and regularly aggregates up to 4.2" (107.7mm) of precipitation.

How cold is the water in October in New Haven?

In New Haven, Connecticut, the average seawater temperature in October is 63.1°F (17.3°C). For most, swimming in 63.1°F (17.3°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

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

The average length of the day in October is 11.1h.

How many hours of sunshine does New Haven have in October?

In October, the average sunshine in New Haven is 7h.

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

In October, the average daily maximum UV index in New Haven, Connecticut, is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in October - New Haven, CT
  • Average high temperature in October: 63.4°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 October: 45°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 October - New Haven, CT
  • Average rainfall in October: 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 October - New Haven, CT
  • Average rainfall days in October: 7 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 October - New Haven, CT
  • Average sea temperature in October: 63.1°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 October / Average sunshine in October - New Haven, CT
  • Average daylight in October: 11.1h

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 October: 7h

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 October - New Haven, CT
  • Average UV index in October: 4

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).