September weather forecast
Clayton, NJ

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Weather in September

September, the first month of the autumn in Clayton, is still a warm month, with an average temperature varying between 61.2°F (16.2°C) and 76.5°F (24.7°C).

Temperature

During the shift to September, a minor reduction in average high-temperature is observed, shifting from a warm 83.3°F (28.5°C) in August to a still moderately hot 76.5°F (24.7°C). An average low-temperature of 61.2°F (16.2°C) is recorded during the nights in September.

Humidity

In September, the average relative humidity is 77%.

Rainfall

The month with the least rainfall is September, when the rain falls for 12 days and typically collects 1.73" (44mm) of precipitation.

Snowfall

In Clayton, snow does not fall in June through October.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:29 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:43 pm EDT.

Sunshine

In September, the average sunshine is 9.1h.

UV index

In Clayton, New Jersey, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: In September, a regular UV index of 5 translates into these guidelines:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Boost your sun resistance with garments that are densely woven yet spacious.
Updated: Jun 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

In Clayton, in September, the average high-temperature is 76.5°F (24.7°C), and the average low-temperature is 61.2°F (16.2°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is appraised at 89.6°F (32°C).

What is the average humidity in September?

The average relative humidity in September is 77%.

What is the driest month?

The month with the least rainfall in Clayton is September, when the rain falls for 12 days and typically collects 1.73" (44mm) of precipitation.

How many days does it rain in September in Clayton?

In Clayton, in September, during 12 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When it does not snow?

In Clayton, snow does not fall in June through October.

How many hours of daylight does Clayton have in September?

In September, the average day length is 12h and 26min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:29 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:43 pm EDT.

How long on average sun shines in September in Clayton?

In Clayton, the average sunshine duration in September is 9.1h.

What is the UV index reading in September?

In Clayton, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health risk 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
Clayton, NJ

Average temperature in September - Clayton, NJ
  • Average high temperature in September: 76.5°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (38.1°F).

  • Average low temperature in September: 61.2°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).

Average pressure in September
Clayton, NJ

Average pressure in September - Clayton, NJ
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Clayton, NJ

Average wind speed in September - Clayton, NJ
  • Average wind speed in September: 6.2mph

The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in September
Clayton, NJ

Average humidity in September - Clayton, NJ
  • Average humidity in September: 77%

The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (71%).

Average rainfall in September
Clayton, NJ

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

The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (1.73").

Average rainfall days in September
Clayton, NJ

Average rainfall days in September - Clayton, NJ
  • Average rainfall days in September: 12 days

The month with the highest number of rainy days is July (16.9 days).
The month with the least rainy days is January (8.8 days).

Average snowfall in September
Clayton, NJ

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

The month with the highest snowfall is March (3.54").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Clayton, NJ

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

The month with the highest number of snowfall days is January (5.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

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

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in September
Clayton, NJ

Average sunshine days in September - Clayton, NJ
  • Average sunshine days in September: 16.3 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.8 days).

Average UV index in September
Clayton, NJ

Average UV index in September - Clayton, 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, November and December (UV index 2).

Average cloud cover in September
Clayton, NJ

Average cloud cover in September - Clayton, NJ
  • Average cloud cover in September: 35

The months with the most cloud cover are February and March (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 30).

Average visibility in September
Clayton, NJ

Average visibility in September - Clayton, 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).

Clayton, New Jersey, USA

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