September weather forecast and climate
New Haven, NY

The first month of the autumn, September, is still a pleasant month in New Haven, New York, with average temperature fluctuating between 55.2°F (12.9°C) and 68.9°F (20.5°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 74.8°F (23.8°C) in August, to an agreeable 68.9°F (20.5°C). The average low-temperature, in New Haven, is 55.2°F (12.9°C).

Humidity

With an average relative humidity of 77%, September is the least humid month.

Rainfall

September is the month with the least rainfall in New Haven. Rain falls for 14.2 days and accumulates 2.36" (60mm) of precipitation.

Snowfall

In New Haven, New York, snow does not fall in June through September.

Daylight

The average length of the day in September is 12.5h.

Sunshine

In New Haven, the average sunshine in September is 9.2h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 September in New Haven?

In September, in New Haven, the average high-temperature is 68.9°F (20.5°C), and the average low-temperature is 55.2°F (12.9°C).

What is the least humid month in New Haven?

With an average relative humidity of 77%, September is the least humid month in New Haven.

What is the average humidity in September in New Haven?

In New Haven, the average relative humidity in September is 77%.

How many days does it rain in September in New Haven?

In New Haven, New York, in September, it is raining for 14.2 days, with typically 2.36" (60mm) of accumulated precipitation.

What is the driest month in New Haven?

The month with the least rainfall is September when the rain falls for 14.2 days and typically collects 2.36" (60mm) of precipitation.

Does it snow in New Haven in September?

In New Haven, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in New Haven?

June through September are months without snowfall.

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

In New Haven, the average length of the day in September is 12.5h.

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

In New Haven, New York, the average sunshine in September is 9.2h.

What is the UV index reading in September in New Haven?

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.
Average temperature in September - New Haven, NY
  • Average high temperature in September: 20.5°C

The warmest month (with the highest average high temperature) is July (24°C).
The month with the lowest average high temperature is January (-2.3°C).

  • Average low temperature in September: 12.9°C

The month with the highest average low temperature is July (16.8°C).
The coldest month (with the lowest average low temperature) is January (-7.8°C).

Average pressure in September - New Haven, NY
  • Average pressure in September: 1017.5mbar

The month with the highest atmospheric pressure is November (1018.7mbar).
The month with the lowest atmospheric pressure is June (1013mbar).

Average wind speed in September - New Haven, NY
  • Average wind speed in September: 12.7km/h

The windiest month (with the highest average wind speed) is January (19.2km/h).
The calmest month (with the lowest average wind speed) is July (11km/h).

Average humidity in September - New Haven, NY
  • Average humidity in September: 77%

Months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is September (77%).

Average rainfall in September - New Haven, NY
  • Average rainfall in September: 60mm

The wettest month (with the highest rainfall) is October (102mm).
The driest month (with the least rainfall) is September (60mm).

Average rainfall days in September - New Haven, NY
  • Average rainfall days in September: 14.2 days

The month with the highest number of rainy days is October (19.1 days).
The month with the least rainy days is February (7.8 days).

Average snowfall in September - New Haven, NY
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (228mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September - New Haven, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (18.9 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - New Haven, NY
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 2.4h).

Average sunshine days in September - New Haven, NY
  • Average sunshine days in September: 14 days

The month with the most sunshine days is September (14 days).
The month with the least sunshine days is January (6.3 days).

Average UV index in September - New Haven, NY
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January and December (UV index 1).

Average cloud cover in September - New Haven, NY
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 77).
Months with the least cloud cover are July and August (Cloud cover 30).

Average visibility in September - New Haven, NY
  • Average visibility in September: 9km

Months with the highest visibility are April, May, June, July, August, September, October and November (9km).
Months with the lowest visibility are January, February, March and December (8km).