September weather forecast and climate
Pennington, NJ

September, the first month of the autumn, in Pennington, is still a warm month, with average temperature fluctuating between 76.1°F (24.5°C) and 59°F (15°C).

Temperature

In September, the average high-temperature slightly decreases, from 82.9°F (28.3°C) in August, to a still warm 76.1°F (24.5°C). In Pennington, New Jersey, in September, the average low-temperature is 59°F (15°C).

Humidity

The average relative humidity in September is 76%.

Rainfall

In Pennington, it is raining for 11.6 days, with typically 0.98" (25mm) of accumulated precipitation. In Pennington, during the entire year, the rain falls for 138.1 days and collects up to 16.5" (419mm) of precipitation.

Snowfall

In Pennington snow does not fall in June through October.

Daylight

The average length of the day is 12.4h.

Sunshine

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

UV index

In September, the average daily maximum UV index in Pennington is 4. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Pennington?

In September, in Pennington, New Jersey, the average high-temperature is 76.1°F (24.5°C), and the average low-temperature is 59°F (15°C).

What is the average humidity in September in Pennington?

The average relative humidity in September in Pennington is 76%.

How much does it rain in Pennington in September?

In Pennington, New Jersey, during September, the rain falls for 11.6 days and regularly aggregates up to 0.98" (25mm) of precipitation.

When it does not snow in Pennington?

June through October are months without snowfall.

How many hours of daylight does Pennington have in September?

In September, the average length of the day in Pennington is 12.4h.

How many hours of sunshine does Pennington have in September?

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

What is the UV index reading in September in Pennington?

In September, the average daily maximum UV index in Pennington, New Jersey, is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.
Average temperature in September - Pennington, NJ
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is July (85.1°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 (67.3°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

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

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in September - Pennington, NJ
  • Average humidity in September: 76%

Months with the highest relative humidity are February, October and December (78%).
Months with the lowest relative humidity are April and July (73%).

Average rainfall in September - Pennington, NJ
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is July (2.24").
The driest month (with the least rainfall) is January (0.87").

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

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is November (7.2 days).

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

The month with the highest snowfall is February (0.71").
Months with the least snowfall are June, July, August, September and October (0").

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

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

Average daylight in September / Average sunshine in September - Pennington, NJ
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 8.8h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.8h).

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

The month with the most sunshine days is January (20.7 days).
The month with the least sunshine days is July (12.3 days).

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

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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

Months with the most cloud cover are February and December (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).

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

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).