September weather forecast
Demarest, NJ

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Demarest, New Jersey, with an average temperature varying between 59.9°F (15.5°C) and 75.4°F (24.1°C).

Temperature

The arrival of September signals a subtle shift in temperature, down from 82.9°F (28.3°C) in August to a still moderately hot 75.4°F (24.1°C). During September, Demarest records an average temperature of 59.9°F (15.5°C) at night.

Humidity

The average relative humidity in September in Demarest is 73%.

Rainfall

September is the month with the least rainfall in Demarest. Rain falls for 11.6 days and accumulates 1.73" (44mm) of precipitation.

Snowfall

In Demarest, snow does not fall in May through October.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of September, sunrise is at 6:23 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.

Sunshine

In September, the average sunshine in Demarest is 8.6h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum UV index of 4 in September translates into the following recommendations:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
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Frequently asked questions

What is the usual temperature for Demarest in September?

An average high-temperature, in September, in Demarest, is 75.4°F (24.1°C) and the average low-temperature is 59.9°F (15.5°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is estimated at 87.8°F (31°C).

What is the average humidity in September in Demarest?

In September, the average relative humidity is 73%.

What is the driest month in Demarest?

September is the month with the least rainfall in Demarest. Rain falls for 11.6 days and accumulates 1.73" (44mm) of precipitation.

How many days does it rain in September in Demarest?

In September, in Demarest, New Jersey, the rain falls for 11.6 days. Throughout September, 1.73" (44mm) of precipitation is accumulated.

When it does not snow in Demarest?

In Demarest, snow does not fall in May through October.

How many hours of daylight does Demarest have in September?

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

When is the sunrise / sunset in September in Demarest?

On the first day of September in Demarest, New Jersey, sunrise is at 6:23 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 Demarest?

In September, the average sunshine duration is 8.6h.

What is the UV index intensity in September in Demarest?

The average daily maximum UV index in September in Demarest is 4. A UV Index estimate of 3 to 5 represents a moderate health threat 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
Demarest, NJ

Average temperature in September - Demarest, NJ
  • Average high temperature in September: 75.4°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (35.4°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (24.1°F).

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Average pressure in September
Demarest, NJ

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

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Demarest, NJ

Average wind speed in September - Demarest, NJ
  • Average wind speed in September: 6.3mph

The windiest months (with the highest average wind speed) are January and March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).

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Average humidity in September
Demarest, NJ

Average humidity in September - Demarest, NJ
  • Average humidity in September: 73%

The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is August (68%).

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Average rainfall in September
Demarest, NJ

Average rainfall in September - Demarest, NJ
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is December (3.46").
The driest month (with the least rainfall) is September (1.73").

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Average rainfall days in September
Demarest, NJ

Average rainfall days in September - Demarest, NJ
  • Average rainfall days in September: 11.6 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (8.2 days).

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Average snowfall in September
Demarest, NJ

Average snowfall in September - Demarest, NJ
  • Average snowfall in September: 0"

The month with the highest snowfall is March (3.07").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Demarest, NJ

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

The month with the highest number of snowfall days is January (6.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Demarest, NJ

Average daylight in September / Average sunshine in September - Demarest, 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 36min).

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Average sunshine days in September
Demarest, NJ

Average sunshine days in September - Demarest, NJ
  • Average sunshine days in September: 16.7 days

The months with the most sunshine days are January and November (18.1 days).
The months with the least sunshine days are April and June (12.7 days).

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Average UV index in September
Demarest, NJ

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

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, March, November and December (UV index 2).

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Average cloud cover in September
Demarest, NJ

Average cloud cover in September - Demarest, NJ
  • Average cloud cover in September: 37

The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Demarest, NJ

Average visibility in September - Demarest, 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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Demarest, New Jersey, USA

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