September weather forecast
Brooklyn, CT

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Weather in September

The first month of the autumn, September, is still a pleasant month in Brooklyn, Connecticut, with an average temperature varying between 55.4°F (13°C) and 72.3°F (22.4°C).

Temperature

The move into September indicates a slight reduction in the average high-temperature, down from August's warm 79.7°F (26.5°C) to an agreeable 72.3°F (22.4°C). In Brooklyn, the average nighttime temperature during September is a moderate 55.4°F (13°C).

Humidity

February, June, July, September and October, with an average relative humidity of 79%, are the most humid months.

Rainfall

September is the month with the least rainfall. Rain falls for 13.6 days and accumulates 1.81" (46mm) of precipitation.

Snowfall

In Brooklyn, snow does not fall in June through October.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of September in Brooklyn, sunrise is at 6:14 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:30 pm EDT.

Sunshine

The average sunshine in September in Brooklyn is 8.4h.

UV index

The average daily maximum UV index in September in Brooklyn, Connecticut, is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index of 4 during September translates into these guidelines:
Make use of precautions - It is urged to ward off sun damage. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. 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.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures in Brooklyn?

In Brooklyn, 72.3°F (22.4°C) is the average high-temperature and 55.4°F (13°C) is the average low-temperature during September. In July, the average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, is evaluated at 86°F (30°C).

What is the most humid month in Brooklyn?

February, June, July, September and October, with an average relative humidity of 79%, are most humid months.

What is the average humidity in September in Brooklyn?

In Brooklyn, Connecticut, the average relative humidity in September is 79%.

What is the driest month in Brooklyn?

The month with the least rainfall in Brooklyn, Connecticut, is September, when the rain falls for 13.6 days and typically collects 1.81" (46mm) of precipitation.

How many days does it rain in September in Brooklyn?

In Brooklyn, in September, during 13.6 rainfall days, 1.81" (46mm) of precipitation is typically accumulated.

When it does not snow in Brooklyn?

June through October are months without snowfall in Brooklyn, Connecticut.

What is the average length of the day in September in Brooklyn?

In September, the average day length in Brooklyn, Connecticut, is 12h and 28min.

When is the sunrise / sunset in September in Brooklyn?

On the first day of September in Brooklyn, Connecticut, sunrise is at 6:14 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:30 pm EDT.

How long on average sun shines in September in Brooklyn?

In September, the average sunshine duration in Brooklyn, Connecticut, is 8.4h.

What is the UV index intensity in September in Brooklyn?

In Brooklyn, Connecticut, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Brooklyn, CT

Average temperature in September - Brooklyn, CT
  • Average high temperature in September: 72.3°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in September: 55.4°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in September
Brooklyn, CT

Average pressure in September - Brooklyn, CT
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
Brooklyn, CT

Average wind speed in September - Brooklyn, CT
  • Average wind speed in September: 6.5mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

Average humidity in September
Brooklyn, CT

Average humidity in September - Brooklyn, CT
  • Average humidity in September: 79%

The months with the highest relative humidity are February, June, July, September and October (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall in September
Brooklyn, CT

Average rainfall in September - Brooklyn, CT
  • Average rainfall in September: 1.81"

The wettest month (with the highest rainfall) is December (3.43").
The driest month (with the least rainfall) is September (1.81").

Average rainfall days in September
Brooklyn, CT

Average rainfall days in September - Brooklyn, CT
  • Average rainfall days in September: 13.6 days

The month with the highest number of rainy days is July (17.5 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in September
Brooklyn, CT

Average snowfall in September - Brooklyn, CT
  • Average snowfall in September: 0"

The month with the highest snowfall is March (3.7").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Brooklyn, CT

Average snowfall days in September - Brooklyn, CT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Brooklyn, CT

Average daylight in September / Average sunshine in September - Brooklyn, CT
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 2min

The months with the most sunshine are July and August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in September
Brooklyn, CT

Average sunshine days in September - Brooklyn, CT
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (10.6 days).

Average UV index in September
Brooklyn, CT

Average UV index in September - Brooklyn, CT
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in September
Brooklyn, CT

Average cloud cover in September - Brooklyn, CT
  • Average cloud cover in September: 38

The months with the most cloud cover are February and March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 34).

Average visibility in September
Brooklyn, CT

Average visibility in September - Brooklyn, CT
  • Average visibility in September: 5mi

The months with the highest visibility are January, February, March, April, October, November and December (6mi).
The months with the lowest visibility are May, June, July, August and September (5mi).

Brooklyn, Connecticut, USA

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