September weather forecast and climate
Greendell, NJ

September, the first month of the autumn, in Greendell, is also a moderately hot month, with average temperature varying between 53.6°F (12°C) and 73.9°F (23.3°C).

Temperature

In Greendell, New Jersey, the average high-temperature slightly decreases, from 80.2°F (26.8°C) in August, to a still warm 73.9°F (23.3°C). The average low-temperature, in September, is 53.6°F (12°C).

Humidity

The average relative humidity is 79%.

Rainfall

The month with the least rainfall in Greendell is September when the rain falls for 11.3 days and typically collects 1.54" (39mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in Greendell is 12.4h.

Sunshine

The average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index in Greendell is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Greendell?

In Greendell, New Jersey, in September, the average high-temperature is 73.9°F (23.3°C), and the average low-temperature is 53.6°F (12°C).

What is the average humidity in September in Greendell?

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

How much does it rain in Greendell in September?

In September, the rain falls for 11.3 days. Throughout September, 1.54" (39mm) of precipitation is accumulated.

What is the driest month in Greendell?

The month with the least rainfall in Greendell is September when the rain falls for 11.3 days and typically collects 1.54" (39mm) of precipitation.

Does it snow in Greendell in September?

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

When it does not snow in Greendell?

In Greendell, New Jersey, snow does not fall in June through September.

How many hours of daylight does Greendell have in September?

The average length of the day in September in Greendell, New Jersey, is 12.4h.

How long on average sun shines in September in Greendell?

The average sunshine in September in Greendell is 8.5h.

What is the UV index reading in September in Greendell?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Greendell, NJ
  • Average high temperature in September: 23.3°C

The warmest month (with the highest average high temperature) is July (28.2°C).
The month with the lowest average high temperature is January (0.7°C).

  • Average low temperature in September: 12°C

The month with the highest average low temperature is July (16.6°C).
The coldest month (with the lowest average low temperature) is January (-6.5°C).

Average pressure in September - Greendell, NJ
  • Average pressure in September: 1017.9mbar

The month with the highest atmospheric pressure is November (1019.7mbar).
The month with the lowest atmospheric pressure is June (1013.7mbar).

Average wind speed in September - Greendell, NJ
  • Average wind speed in September: 8.8km/h

The windiest month (with the highest average wind speed) is March (12.7km/h).
The calmest month (with the lowest average wind speed) is August (7.9km/h).

Average humidity in September - Greendell, NJ
  • Average humidity in September: 79%

Months with the highest relative humidity are February and December (82%).
The month with the lowest relative humidity is April (76%).

Average rainfall in September - Greendell, NJ
  • Average rainfall in September: 39mm

The wettest month (with the highest rainfall) is July (77mm).
The driest month (with the least rainfall) is September (39mm).

Average rainfall days in September - Greendell, NJ
  • Average rainfall days in September: 11.3 days

Months with the highest number of rainy days are May and July (17.3 days).
The month with the least rainy days is January (7.5 days).

Average snowfall in September - Greendell, NJ
  • Average snowfall in September: 0mm

Months with the highest snowfall are January and February (109mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September - Greendell, NJ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10.3 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Greendell, NJ
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 8.5h

The month with the most sunshine is July (Average sunshine: 10h).
The month with the least sunshine is February (Average sunshine: 4.3h).

Average sunshine days in September - Greendell, NJ
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (11.3 days).

Average UV index in September - Greendell, NJ
  • Average UV index in September: 4

The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September - Greendell, NJ
  • Average cloud cover in September: 41

The month with the most cloud cover is February (Cloud cover 52).
Months with the least cloud cover are July and August (Cloud cover 37).

Average visibility in September - Greendell, NJ
  • Average visibility in September: 8km

The month with the highest visibility is April (9km).
Months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (8km).