September weather forecast
Monmouth Junction, NJ

Share

Weather in September

September, the first month of the autumn in Monmouth Junction, is also a moderately hot month, with an average temperature varying between 59°F (15°C) and 75.7°F (24.3°C).

Temperature

In Monmouth Junction, the beginning of September is marked by a marginally lowered average high-temperature, shifting from August's 82.9°F (28.3°C) to a still warm 75.7°F (24.3°C). Monmouth Junction reports an average nighttime low-temperature of 59°F (15°C) in September.

Humidity

In September, the average relative humidity is 77%.

Rainfall

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

Snowfall

June through October are months without snowfall.

Daylight

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

Sunshine

In Monmouth Junction, New Jersey, the average sunshine in September is 8.8h.

UV index

In September, the average daily maximum UV index in Monmouth Junction is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 4 during September leads to these advisories:
Undertake precautions - It is suggested to shield oneself from sunburn. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
[Resources]

Frequently asked questions

What is the usual temperature for Monmouth Junction in September?

During September, Monmouth Junction experiences an average high-temperature of 75.7°F (24.3°C) and a low-temperature of 59°F (15°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in August is calculated to be 89.6°F (32°C).

What is the average humidity in September in Monmouth Junction?

In Monmouth Junction, New Jersey, the average relative humidity in September is 77%.

What is the driest month in Monmouth Junction?

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

How much does it rain in Monmouth Junction in September?

In Monmouth Junction, during September, the rain falls for 10 days and regularly aggregates up to 0.67" (17mm) of precipitation.

When it does not snow in Monmouth Junction?

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

How many hours of daylight does Monmouth Junction have in September?

The average day length in September in Monmouth Junction is 12h and 27min.

What time are sunrise and sunset in September in Monmouth Junction?

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

How many hours of sunshine does Monmouth Junction have in September?

In September, the average sunshine duration is 8.8h.

How high is the UV index in September in Monmouth Junction?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health risk 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
Monmouth Junction, NJ

Average temperature in September - Monmouth Junction, 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).

[Resources]

Average pressure in September
Monmouth Junction, NJ

Average pressure in September - Monmouth Junction, 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).

[Resources]

Average wind speed in September
Monmouth Junction, NJ

Average wind speed in September - Monmouth Junction, 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).

[Resources]

Average humidity in September
Monmouth Junction, NJ

Average humidity in September - Monmouth Junction, 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%).

[Resources]

Average rainfall in September
Monmouth Junction, NJ

Average rainfall in September - Monmouth Junction, 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").

[Resources]

Average rainfall days in September
Monmouth Junction, NJ

Average rainfall days in September - Monmouth Junction, 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).

[Resources]

Average snowfall in September
Monmouth Junction, NJ

Average snowfall in September - Monmouth Junction, 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").

[Resources]

Average snowfall days in September
Monmouth Junction, NJ

Average snowfall days in September - Monmouth Junction, 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).

[Resources]

Average daylight in September /
Average sunshine in September
Monmouth Junction, NJ

Average daylight in September / Average sunshine in September - Monmouth Junction, 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).

[Resources]

Average sunshine days in September
Monmouth Junction, NJ

Average sunshine days in September - Monmouth Junction, 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).

[Resources]

Average UV index in September
Monmouth Junction, NJ

Average UV index in September - Monmouth Junction, 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).

[Resources]

Average cloud cover in September
Monmouth Junction, NJ

Average cloud cover in September - Monmouth Junction, 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).

[Resources]

Average visibility in September
Monmouth Junction, NJ

Average visibility in September - Monmouth Junction, 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).

[Resources]

Monmouth Junction, New Jersey, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location