September weather forecast
New Brunswick, NJ

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An aerial panorama of the city of Brunswick, New Jersey, seen with its deep tree cover, a large river, and bridges over the river
An aerial panorama of the city of Brunswick, New Jersey, seen with its deep tree cover, a large river, and bridges over the river

Weather in September

The transition from sultry summers to pleasant falls occurs in September in New Brunswick. While days are warm, nights begin to cool off and the humidity gradually recedes, offering soothing rainfall. This makes it a comfortable month, particularly until it gives way to a chillier October. The decline in temperature becomes evident as autumn starts to take control. This transformation becomes noticeable with temperatures ranging between 59.9°F (15.5°C) and 75.9°F (24.4°C) and a rainfall of 1.61" (41mm) ensuring a mildly moist transition to autumn.

Temperature

The onset of September results in a small decrease in the average high-temperature, moderately receding from a warm 82.6°F (28.1°C) in August to a still moderately hot 75.9°F (24.4°C). Throughout the September nights, New Brunswick encounters a low-temperature of 59.9°F (15.5°C).

Humidity

The average relative humidity in September in New Brunswick is 75%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.6 days and accumulates 1.61" (41mm) of precipitation.

Snowfall

June through October are months without snowfall.

Daylight

In New Brunswick, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:25 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:53 am and sunset at 6:41 pm EDT.

Sunshine

In September, the average sunshine in New Brunswick is 8.5h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 5 in September interprets into the following advice:
Take necessary precautions - Protection from skin and eye injury is mandatory. When the Sun is at its strongest around midday, find shade and limit exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun.
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Frequently asked questions

What is the average September temperature in New Brunswick?

An average high-temperature, in September, in New Brunswick, is 75.9°F (24.4°C) and the average low-temperature is 59.9°F (15.5°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is evaluated at 87.8°F (31°C).

What is the average humidity in September in New Brunswick?

The average relative humidity in September in New Brunswick is 75%.

What is the driest month in New Brunswick?

The month with the least rainfall in New Brunswick, New Jersey, is September, when the rain falls for 12.6 days and typically collects 1.61" (41mm) of precipitation.

How much does it rain in New Brunswick in September?

In September, the rain falls for 12.6 days. Throughout September, 1.61" (41mm) of precipitation is accumulated.

When it does not snow in New Brunswick?

June through October are months without snowfall.

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

The average day length in September in New Brunswick, New Jersey, is 12h and 27min.

When is the sunrise / sunset in September in New Brunswick?

On the first day of September in New Brunswick, New Jersey, sunrise is at 6:25 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:41 pm EDT.

How many hours of sunshine does New Brunswick have in September?

In September, the average sunshine duration in New Brunswick is 8.5h.

How high is the UV index in September in New Brunswick?

The average daily maximum UV index in September in New Brunswick is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health 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
New Brunswick, NJ

Average temperature in September - New Brunswick, NJ
  • Average high temperature in September: 75.9°F

The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).

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Average pressure in September
New Brunswick, NJ

Average pressure in September - New Brunswick, NJ
  • Average pressure in September: 30.05"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).

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Average wind speed in September
New Brunswick, NJ

Average wind speed in September - New Brunswick, NJ
  • Average wind speed in September: 6.4mph

The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).

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Average humidity in September
New Brunswick, NJ

Average humidity in September - New Brunswick, NJ
  • Average humidity in September: 75%

The months with the highest relative humidity are February, October and December (77%).
The months with the lowest relative humidity are April and August (72%).

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Average rainfall in September
New Brunswick, NJ

Average rainfall in September - New Brunswick, NJ
  • Average rainfall in September: 1.61"

The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is September (1.61").

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Average rainfall days in September
New Brunswick, NJ

Average rainfall days in September - New Brunswick, NJ
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is January (7.9 days).

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Average snowfall in September
New Brunswick, NJ

Average snowfall in September - New Brunswick, NJ
  • Average snowfall in September: 0"

The month with the highest snowfall is March (3.5").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
New Brunswick, NJ

Average snowfall days in September - New Brunswick, NJ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
New Brunswick, NJ

Average daylight in September / Average sunshine in September - New Brunswick, NJ
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in September
New Brunswick, NJ

Average sunshine days in September - New Brunswick, NJ
  • Average sunshine days in September: 15 days

The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is July (11.1 days).

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Average UV index in September
New Brunswick, NJ

Average UV index in September - New Brunswick, NJ
  • Average UV index in September: 5

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

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Average cloud cover in September
New Brunswick, NJ

Average cloud cover in September - New Brunswick, NJ
  • Average cloud cover in September: 39

The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 33).

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Average visibility in September
New Brunswick, NJ

Average visibility in September - New Brunswick, NJ
  • Average visibility in September: 6mi

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

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New Brunswick, New Jersey, USA

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