September weather forecast
Willow Brook, NJ

Share

Weather in September

The first month of the autumn, September, is still a warm month in Willow Brook, New Jersey, with temperature in the range of an average high of 73.4°F (23°C) and an average low of 54.1°F (12.3°C).

Temperature

September implies a soft temperature shift, with average high-temperatures reducing from August's warm 80.6°F (27°C) to a still moderately hot 73.4°F (23°C). September sees the temperature falling to a mean low of 54.1°F (12.3°C).

Humidity

In Willow Brook, the average relative humidity in September is 79%.

Rainfall

September is the month with the least rainfall. Rain falls for 10.4 days and accumulates 0.63" (16mm) of precipitation.

Snowfall

In Willow Brook, snow does not fall in June through September.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of September in Willow Brook, sunrise is at 6:24 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:40 pm EDT.

Sunshine

In Willow Brook, the average sunshine in September is 8.7h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index of 4 during September translates into the following directions:
Prioritize safety - Recommendations to avert sunburn are shared. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
[Resources]

Frequently asked questions

What are the temperatures in Willow Brook in September?

In September, the average high-temperature and low-temperature in Willow Brook are 73.4°F (23°C) and 54.1°F (12.3°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, is computed to be 84.2°F (29°C).

What is the average humidity in September in Willow Brook?

In Willow Brook, New Jersey, the average relative humidity in September is 79%.

What is the driest month in Willow Brook?

September is the month with the least rainfall in Willow Brook, New Jersey. Rain falls for 10.4 days and accumulates 0.63" (16mm) of precipitation.

How much does it rain in Willow Brook in September?

In Willow Brook, in September, during 10.4 rainfall days, 0.63" (16mm) of precipitation is typically accumulated.

When it does not snow in Willow Brook?

June through September are months without snowfall.

Does it snow in Willow Brook in September?

In Willow Brook, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Willow Brook?

The average day length in September in Willow Brook is 12h and 28min.

When are sunrise and sunset in September in Willow Brook?

On the first day of September in Willow Brook, sunrise is at 6:24 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:40 pm EDT.

How long on average sun shines in September in Willow Brook?

In September, the average sunshine duration in Willow Brook is 8.7h.

What is the UV index reading in September in Willow Brook?

The average daily maximum UV index in September in Willow Brook, New Jersey, is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
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
Willow Brook, NJ

Average temperature in September - Willow Brook, NJ
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (33.3°F).

  • Average low temperature in September: 54.1°F

The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

[Resources]

Average pressure in September
Willow Brook, NJ

Average pressure in September - Willow Brook, NJ
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

[Resources]

Average wind speed in September
Willow Brook, NJ

Average wind speed in September - Willow Brook, NJ
  • Average wind speed in September: 5.2mph

The windiest months (with the highest average wind speed) are January and March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

[Resources]

Average humidity in September
Willow Brook, NJ

Average humidity in September - Willow Brook, NJ
  • Average humidity in September: 79%

The months with the highest relative humidity are February, October and December (81%).
The month with the lowest relative humidity is April (76%).

[Resources]

Average rainfall in September
Willow Brook, NJ

Average rainfall in September - Willow Brook, NJ
  • Average rainfall in September: 0.63"

The wettest month (with the highest rainfall) is July (1.77").
The driest month (with the least rainfall) is September (0.63").

[Resources]

Average rainfall days in September
Willow Brook, NJ

Average rainfall days in September - Willow Brook, NJ
  • Average rainfall days in September: 10.4 days

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is January (5.8 days).

[Resources]

Average snowfall in September
Willow Brook, NJ

Average snowfall in September - Willow Brook, NJ
  • Average snowfall in September: 0"

The month with the highest snowfall is March (1.69").
The months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days in September
Willow Brook, NJ

Average snowfall days in September - Willow Brook, NJ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Willow Brook, NJ

Average daylight in September / Average sunshine in September - Willow Brook, NJ
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).

[Resources]

Average sunshine days in September
Willow Brook, NJ

Average sunshine days in September - Willow Brook, NJ
  • Average sunshine days in September: 16.9 days

The months with the most sunshine days are January and November (20.4 days).
The month with the least sunshine days is June (12.5 days).

[Resources]

Average UV index in September
Willow Brook, NJ

Average UV index in September - Willow Brook, NJ
  • Average UV index in September: 4

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

[Resources]

Average cloud cover in September
Willow Brook, NJ

Average cloud cover in September - Willow Brook, NJ
  • Average cloud cover in September: 40

The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are July and August (Cloud cover 35).

[Resources]

Average visibility in September
Willow Brook, NJ

Average visibility in September - Willow Brook, NJ
  • Average visibility in September: 5mi

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

[Resources]

Willow Brook, New Jersey, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location