September weather forecast
Brentwood, NY

Weather in September

September, the first month of the autumn in Brentwood, is also an agreeable month, with an average temperature ranging between max 72.1°F (22.3°C) and min 65.3°F (18.5°C).

Temperature

In Brentwood, the average high-temperature in September slightly decreases from a warm 78.4°F (25.8°C) in August to an agreeable 72.1°F (22.3°C). The average low-temperature, in September, is 65.3°F (18.5°C).

Humidity

In September, the average relative humidity is 74%.

Rainfall

In September, in Brentwood, New York, the rain falls for 13.5 days. Throughout September, 2.56" (65mm) of precipitation is accumulated. In Brentwood, during the entire year, the rain falls for 153.2 days and collects up to 34.45" (875mm) of precipitation.

Snowfall

April through September are months without snowfall in Brentwood.

Daylight

The average length of the day in September in Brentwood, New York, is 12h and 27min.
On the first day of the month, sunrise is at 6:19 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:37 pm EDT.

Sunshine

The average sunshine in September is 9.1h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
[Resources]

FAQ

What is the temperature in September in Brentwood?

In September, in Brentwood, New York, the average high-temperature is 72.1°F (22.3°C), and the average low-temperature is 65.3°F (18.5°C).

What is the average humidity in September in Brentwood?

In September, the average relative humidity in Brentwood, New York, is 74%.

How many days does it rain in September in Brentwood?

In Brentwood, New York, in September, it is raining for 13.5 days, with typically 2.56" (65mm) of accumulated precipitation.

When it does not snow in Brentwood?

In Brentwood, New York, snow does not fall in April through September.

Does it snow in Brentwood in September?

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

How many hours of daylight does Brentwood have in September?

The average day length in September in Brentwood, New York, is 12h and 27min.

When are sunrise and sunset in September in Brentwood?

On the first day of September, sunrise is at 6:19 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:37 pm EDT.

How long on average sun shines in September in Brentwood?

In September, the average sunshine duration in Brentwood is 9.1h.

What is the UV index intensity in September in Brentwood?

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

Average temperature in September
Brentwood, NY

Average temperature in September - Brentwood, NY
  • Average high temperature in September: 72.1°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in September: 65.3°F

The month with the highest average low temperature is August (72°F).
The coldest month (with the lowest average low temperature) is January (30°F).

[Resources]

Average pressure in September
Brentwood, NY

Average pressure in September - Brentwood, NY
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

[Resources]

Average wind speed in September
Brentwood, NY

Average wind speed in September - Brentwood, NY
  • Average wind speed in September: 10.1mph

The windiest month (with the highest average wind speed) is January (13.4mph).
The calmest month (with the lowest average wind speed) is July (8.6mph).

[Resources]

Average humidity in September
Brentwood, NY

Average humidity in September - Brentwood, NY
  • Average humidity in September: 74%

The months with the highest relative humidity are May and June (77%).
The month with the lowest relative humidity is November (71%).

[Resources]

Average rainfall in September
Brentwood, NY

Average rainfall in September - Brentwood, NY
  • Average rainfall in September: 2.56"

The wettest month (with the highest rainfall) is July (3.86").
The driest month (with the least rainfall) is January (2.05").

[Resources]

Average rainfall days in September
Brentwood, NY

Average rainfall days in September - Brentwood, NY
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (7.6 days).

[Resources]

Average snowfall in September
Brentwood, NY

Average snowfall in September - Brentwood, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (1.97").
The months with the least snowfall are April, May, June, July, August and September (0").

[Resources]

Average snowfall days in September
Brentwood, NY

Average snowfall days in September - Brentwood, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Brentwood, NY

Average daylight in September / Average sunshine in September - Brentwood, NY
  • Average daylight in September: 12h and 27min

The month with the longest days is June (Average daylight: 15h and 3min).
The month with the shortest days is December (Average daylight: 9h and 19min).

  • Average sunshine in September: 9h and 6min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

[Resources]

Average sunshine days in September
Brentwood, NY

Average sunshine days in September - Brentwood, NY
  • Average sunshine days in September: 14.7 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.2 days).

[Resources]

Average UV index in September
Brentwood, NY

Average UV index in September - Brentwood, NY
  • Average UV index in September: 5

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 and December (UV index 2).

[Resources]

Average cloud cover in September
Brentwood, NY

Average cloud cover in September - Brentwood, NY
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).

[Resources]

Average visibility in September
Brentwood, NY

Average visibility in September - Brentwood, NY
  • Average visibility in September: 6mi

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

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location