September weather forecast
South Dennis, NJ

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Weather in September

September, the first month of the autumn in South Dennis, is still a warm month, with an average temperature varying between 66.2°F (19°C) and 73.9°F (23.3°C).

Temperature

The start of September involves a subtle temperature drop, shifting from 79.9°F (26.6°C) in August to a still moderately hot 73.9°F (23.3°C). South Dennis records a consistent average nighttime temperature of 66.2°F (19°C) in September, slightly lower than the daytime high.

Humidity

In September, the average relative humidity is 77%.

Rainfall

In South Dennis, during September, the rain falls for 10.6 days and regularly aggregates up to 0.91" (23mm) of precipitation. Throughout the year, in South Dennis, there are 130.8 rainfall days, and 13.23" (336mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall in South Dennis.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:28 am and sunset at 7:29 pm. On the last day of September, in South Dennis, sunrise is at 6:55 am and sunset at 6:43 pm EDT.

Sunshine

The average sunshine in September is 9.5h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: An average UV index of 5 in September transforms into this advice:
Exercise prevention - Protecting skin and eyes from harm is required. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
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Frequently asked questions

What is the usual temperature for South Dennis in September?

The average high-temperature and low-temperature in South Dennis during September are 73.9°F (23.3°C) and 66.2°F (19°C) respectively. In July, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is appraised at 86°F (30°C).

What is the average humidity in September in South Dennis?

In September, the average relative humidity in South Dennis is 77%.

How many days does it rain in September in South Dennis?

In South Dennis, New Jersey, during September, the rain falls for 10.6 days and regularly aggregates up to 0.91" (23mm) of precipitation.

When it does not snow in South Dennis?

April through October are months without snowfall in South Dennis, New Jersey.

How many hours of daylight does South Dennis have in September?

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

When are sunrise and sunset in September in South Dennis?

In September, on the first day of the month, sunrise is at 6:28 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:43 pm EDT.

How many hours of sunshine does South Dennis have in September?

The average sunshine duration in September is 9.5h.

How high is the UV index in September in South Dennis?

The average daily maximum UV index in September in South Dennis is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
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
South Dennis, NJ

Average temperature in September - South Dennis, NJ
  • Average high temperature in September: 73.9°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in September: 66.2°F

The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).

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Average pressure in September
South Dennis, NJ

Average pressure in September - South Dennis, NJ
  • Average pressure in September: 30.04"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in September
South Dennis, NJ

Average wind speed in September - South Dennis, NJ
  • Average wind speed in September: 9.5mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (8.1mph).

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Average humidity in September
South Dennis, NJ

Average humidity in September - South Dennis, NJ
  • Average humidity in September: 77%

The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is November (73%).

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Average rainfall in September
South Dennis, NJ

Average rainfall in September - South Dennis, NJ
  • Average rainfall in September: 0.91"

The wettest month (with the highest rainfall) is August (1.61").
The driest month (with the least rainfall) is January (0.67").

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Average rainfall days in September
South Dennis, NJ

Average rainfall days in September - South Dennis, NJ
  • Average rainfall days in September: 10.6 days

The month with the highest number of rainy days is July (15.2 days).
The month with the least rainy days is January (7 days).

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Average snowfall in September
South Dennis, NJ

Average snowfall in September - South Dennis, NJ
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
South Dennis, NJ

Average snowfall days in September - South Dennis, NJ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
South Dennis, NJ

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 3min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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Average sunshine days in September
South Dennis, NJ

Average sunshine days in September - South Dennis, NJ
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (13.4 days).

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Average UV index in September
South Dennis, NJ

Average UV index in September - South Dennis, 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 and December (UV index 2).

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Average cloud cover in September
South Dennis, NJ

Average cloud cover in September - South Dennis, NJ
  • Average cloud cover in September: 29

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 25).

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Average visibility in September
South Dennis, NJ

Average visibility in September - South Dennis, 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).

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South Dennis, New Jersey, USA

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