September weather forecast
Green Island, NJ

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Green Island, New Jersey, with an average temperature varying between 64.6°F (18.1°C) and 73.6°F (23.1°C).

Temperature

Green Island experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a moderately hot 79.7°F (26.5°C) in August to a still warm 73.6°F (23.1°C). The low temperature average during September reflects a slight decrease to an enjoyable 64.6°F (18.1°C) from the day's peak.

Humidity

The average relative humidity in September is 77%.

Rainfall

In Green Island, in September, it is raining for 12.3 days, with typically 1.46" (37mm) of accumulated precipitation. In Green Island, during the entire year, the rain falls for 137.7 days and collects up to 19.09" (485mm) of precipitation.

Snowfall

In Green Island, snow does not fall in April through October.

Daylight

In Green Island, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:24 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:39 pm EDT.

Sunshine

In Green Island, the average sunshine in September is 9h.

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 5 during September leads to these instructions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Updated: Aug 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

During September, Green Island experiences an average high-temperature of 73.6°F (23.1°C) and a low-temperature of 64.6°F (18.1°C). In July, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines relative humidity and air temperature, is appraised at 86°F (30°C).

What is the average humidity in September?

In September, the average relative humidity is 77%.

How many days does it rain in September?

In Green Island, in September, during 12.3 rainfall days, 1.46" (37mm) of precipitation is typically accumulated.

When it does not snow?

April through October are months without snowfall in Green Island.

What is the average length of the day in September?

The average day length in September is 12h and 26min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:24 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:39 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 9h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability 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
Green Island, NJ

Average temperature in September - Green Island, NJ
  • Average high temperature in September: 73.6°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in September: 64.6°F

The month with the highest average low temperature is July (70.9°F).
The coldest month (with the lowest average low temperature) is January (29.1°F).

Average pressure in September
Green Island, NJ

Average pressure in September - Green Island, 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).

Average wind speed in September
Green Island, NJ

Average wind speed in September - Green Island, NJ
  • Average wind speed in September: 9.3mph

The windiest month (with the highest average wind speed) is January (12.2mph).
The calmest month (with the lowest average wind speed) is July (8mph).

Average humidity in September
Green Island, NJ

Average humidity in September - Green Island, NJ
  • Average humidity in September: 77%

The months with the highest relative humidity are May and June (80%).
The months with the lowest relative humidity are January, March and November (74%).

Average rainfall in September
Green Island, NJ

Average rainfall in September - Green Island, NJ
  • Average rainfall in September: 1.46"

The wettest month (with the highest rainfall) is July (2.56").
The driest month (with the least rainfall) is January (0.94").

Average rainfall days in September
Green Island, NJ

Average rainfall days in September - Green Island, NJ
  • Average rainfall days in September: 12.3 days

The month with the highest number of rainy days is July (16.1 days).
The month with the least rainy days is January (7 days).

Average snowfall in September
Green Island, NJ

Average snowfall in September - Green Island, NJ
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.91").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Green Island, NJ

Average snowfall days in September - Green Island, NJ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Green Island, NJ

Average daylight in September / Average sunshine in September - Green Island, 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 24min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in September
Green Island, NJ

Average sunshine days in September - Green Island, NJ
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is January (20.2 days).
The month with the least sunshine days is July (11.9 days).

Average UV index in September
Green Island, NJ

Average UV index in September - Green Island, NJ
  • 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, November and December (UV index 2).

Average cloud cover in September
Green Island, NJ

Average cloud cover in September - Green Island, NJ
  • Average cloud cover in September: 33

The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 28).

Average visibility in September
Green Island, NJ

Average visibility in September - Green Island, NJ
  • 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).

Green Island, New Jersey, USA

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