September weather forecast
Chatham, NJ

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Weather in September

September, the first month of the autumn in Chatham, is still a warm month, with temperature in the range of an average high of 74.5°F (23.6°C) and an average low of 57.6°F (14.2°C).

Temperature

September's onset brings a negligible change in high-temperatures, falling from a warm 81.9°F (27.7°C) in August to a still moderately hot 74.5°F (23.6°C). An average low-temperature of 57.6°F (14.2°C) is common in Chatham during the nights of September.

Humidity

The average relative humidity in September is 77%.

Rainfall

The month with the least rainfall is September, when the rain falls for 13.5 days and typically collects 1.69" (43mm) of precipitation.

Snowfall

June through September are months without snowfall in Chatham.

Daylight

The average length of the day in September in Chatham is 12h and 27min.
On the first day of September in Chatham, sunrise is at 6:25 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:40 pm EDT.

Sunshine

In Chatham, the average sunshine in September is 8.5h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index, 4 during September, leads to the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
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Frequently asked questions

What are the temperatures in Chatham in September?

The average high-temperature and low-temperature during September are 74.5°F (23.6°C) and 57.6°F (14.2°C) respectively. In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is computed to be 87.8°F (31°C).

What is the average humidity in September in Chatham?

The average relative humidity in September in Chatham is 77%.

What is the driest month in Chatham?

September is the month with the least rainfall in Chatham. Rain falls for 13.5 days and accumulates 1.69" (43mm) of precipitation.

How much does it rain in Chatham in September?

In Chatham, New Jersey, during September, the rain falls for 13.5 days and regularly aggregates up to 1.69" (43mm) of precipitation.

When it does not snow in Chatham?

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

Does it snow in Chatham in September?

In Chatham, New Jersey, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Chatham?

In September, the average day length in Chatham, New Jersey, is 12h and 27min.

What time are sunrise and sunset in September in Chatham?

In September, on the first day of the month, sunrise is at 6:25 am and sunset at 7:29 pm. On the last day of the month, in Chatham, sunrise is at 6:53 am and sunset at 6:40 pm EDT.

How many hours of sunshine does Chatham have in September?

In September, the average sunshine duration in Chatham is 8.5h.

What is the UV index intensity in September in Chatham?

In Chatham, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe 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
Chatham, NJ

Average temperature in September - Chatham, NJ
  • Average high temperature in September: 74.5°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in September: 57.6°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

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Average pressure in September
Chatham, NJ

Average pressure in September - Chatham, NJ
  • Average pressure in September: 30.06"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).

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Average wind speed in September
Chatham, NJ

Average wind speed in September - Chatham, NJ
  • Average wind speed in September: 5.8mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

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Average humidity in September
Chatham, NJ

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

The months with the highest relative humidity are February and December (80%).
The months with the lowest relative humidity are April and August (74%).

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Average rainfall in September
Chatham, NJ

Average rainfall in September - Chatham, NJ
  • Average rainfall in September: 1.69"

The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is September (1.69").

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Average rainfall days in September
Chatham, NJ

Average rainfall days in September - Chatham, NJ
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is January (8.8 days).

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Average snowfall in September
Chatham, NJ

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

The month with the highest snowfall is March (3.5").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Chatham, NJ

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

The month with the highest number of snowfall days is January (7.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Chatham, NJ
  • Average daylight in September: 12h and 3min

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 18min).

  • Average sunshine in September: 8h and 3min

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
Chatham, NJ

Average sunshine days in September - Chatham, NJ
  • Average sunshine days in September: 14.2 days

The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is June (10.5 days).

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Average UV index in September
Chatham, NJ

Average UV index in September - Chatham, 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
Chatham, NJ

Average cloud cover in September - Chatham, NJ
  • Average cloud cover in September: 39

The months with the most cloud cover are February and March (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 34).

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Average visibility in September
Chatham, NJ

Average visibility in September - Chatham, NJ
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

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Chatham, New Jersey, USA

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