September weather forecast
Griggstown, NJ

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Griggstown, New Jersey, with an average temperature fluctuating between 59°F (15°C) and 75.7°F (24.3°C).

Temperature

September heralds a minor drop in average high-temperature, sliding from August's 82.9°F (28.3°C) to a still moderately hot 75.7°F (24.3°C). September nights in Griggstown experience a consistent temperature drop to a mild 59°F (15°C).

Humidity

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

Rainfall

The month with the least rainfall in Griggstown is September, when the rain falls for 10 days and typically collects 0.67" (17mm) of precipitation.

Snowfall

In Griggstown, New Jersey, snow does not fall in June through October.

Daylight

In Griggstown, New Jersey, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:26 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:41 pm EDT.

Sunshine

In Griggstown, the average sunshine in September is 8.8h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the maximum UV index of 4 translates into these guidelines:
Make use of precautions - It is urged to ward off sun damage. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
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Frequently asked questions

What are the temperatures in Griggstown in September?

September temperatures in Griggstown vary between a high-temperature of 75.7°F (24.3°C) and a low-temperature of 59°F (15°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, is calculated to be 89.6°F (32°C).

What is the average humidity in September in Griggstown?

In September, the average relative humidity is 77%.

What is the driest month in Griggstown?

September is the month with the least rainfall in Griggstown, New Jersey. Rain falls for 10 days and accumulates 0.67" (17mm) of precipitation.

How many days does it rain in September in Griggstown?

In Griggstown, in September, it is raining for 10 days, with typically 0.67" (17mm) of accumulated precipitation.

When it does not snow in Griggstown?

In Griggstown, New Jersey, snow does not fall in June through October.

How many hours of daylight does Griggstown have in September?

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

What time are sunrise and sunset in September in Griggstown?

In September, on the first day of the month, sunrise is at 6:26 am and sunset at 7:29 pm. On the last day of the month, in Griggstown, New Jersey, sunrise is at 6:54 am and sunset at 6:41 pm EDT.

How many hours of sunshine does Griggstown have in September?

In Griggstown, New Jersey, the average sunshine duration in September is 8.8h.

What is the UV index reading in September in Griggstown?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's 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
Griggstown, NJ

Average temperature in September - Griggstown, NJ
  • Average high temperature in September: 75.7°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in September: 59°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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Average pressure in September
Griggstown, NJ

Average pressure in September - Griggstown, NJ
  • Average pressure in September: 30.05"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
Griggstown, NJ

Average wind speed in September - Griggstown, NJ
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

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Average humidity in September
Griggstown, NJ

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

The month with the highest relative humidity is October (79%).
The month with the lowest relative humidity is April (73%).

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Average rainfall in September
Griggstown, NJ

Average rainfall in September - Griggstown, NJ
  • Average rainfall in September: 0.67"

The wettest month (with the highest rainfall) is July (1.69").
The driest month (with the least rainfall) is September (0.67").

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Average rainfall days in September
Griggstown, NJ

Average rainfall days in September - Griggstown, NJ
  • Average rainfall days in September: 10 days

The month with the highest number of rainy days is July (13.9 days).
The month with the least rainy days is January (6.1 days).

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Average snowfall in September
Griggstown, NJ

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

The month with the highest snowfall is March (1.42").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Griggstown, NJ

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

The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

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

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 5min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days in September
Griggstown, NJ

Average sunshine days in September - Griggstown, NJ
  • Average sunshine days in September: 17.2 days

The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is July (13.3 days).

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Average UV index in September
Griggstown, NJ

Average UV index in September - Griggstown, 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
Griggstown, NJ

Average cloud cover in September - Griggstown, NJ
  • Average cloud cover in September: 38

The months with the most cloud cover are February, March and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 33).

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Average visibility in September
Griggstown, NJ

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

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