September weather forecast
Monmouth Beach, NJ

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Weather in September

September, the first month of the autumn in Monmouth Beach, is also an agreeable month, with an average temperature fluctuating between 65.1°F (18.4°C) and 73.2°F (22.9°C).

Temperature

With the onset of September, Monmouth Beach experiences a modest temperature adjustment, with the average high-temperature gently receding from a moderately hot 79.3°F (26.3°C) in August to an agreeable 73.2°F (22.9°C). In Monmouth Beach, September is characterized by an average low-temperature of 65.1°F (18.4°C), indicating a minor drop from daytime highs.

Humidity

In Monmouth Beach, the average relative humidity in September is 76%.

Rainfall

In Monmouth Beach, in September, it is raining for 11 days, with typically 0.75" (19mm) of accumulated precipitation. Throughout the year, there are 122.1 rainfall days, and 11.14" (283mm) of precipitation is accumulated.

Snowfall

April through September and November are months without snowfall.

Ocean temperature

In Monmouth Beach, New Jersey, in September, the average water temperature is 70.3°F (21.3°C).
Note: When the surface water temperature is 70.3°F (21.3°C), most do not enjoy swimming. Breathing control becomes more complex as temperatures drop below 69.8°F (21°C).

Daylight

The average length of the day in September is 12h and 27min.
On the first day of September, sunrise is at 6:24 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:39 pm EDT.

Sunshine

The average sunshine in September is 9.1h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum UV index of 5 during September leads to these instructions:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Minimize direct exposure to the Sun during midday when its radiation is at its peak. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
Updated: Aug 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

In September, the average high-temperature and low-temperature are 73.2°F (22.9°C) and 65.1°F (18.4°C) respectively.

What is the average humidity in September?

In September, the average relative humidity is 76%.

How many days does it rain in September?

In Monmouth Beach, in September, during 11 rainfall days, 0.75" (19mm) of precipitation is typically accumulated.

When it does not snow?

April through September and November are months without snowfall.

Does it snow in September?

In Monmouth Beach, in September, it doesn't snow. In October, it regularly snows.

What is the ocean temperature in September?

In Monmouth Beach, the average seawater temperature in September is 70.3°F (21.3°C). For most, swimming in 70.3°F (21.3°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

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

In September, the average day length is 12h and 27min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:24 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:39 pm EDT.

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

The average sunshine duration in September is 9.1h.

What is the UV index intensity in September?

The average daily maximum UV index in September in Monmouth Beach is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health 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
Monmouth Beach, NJ

Average temperature in September - Monmouth Beach, NJ
  • Average high temperature in September: 73.2°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in September: 65.1°F

The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (28.9°F).

Average pressure in September
Monmouth Beach, NJ

Average pressure in September - Monmouth Beach, 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).

Average wind speed in September
Monmouth Beach, NJ

Average wind speed in September - Monmouth Beach, NJ
  • Average wind speed in September: 9.3mph

The windiest month (with the highest average wind speed) is January (12.6mph).
The calmest month (with the lowest average wind speed) is July (8mph).

Average humidity in September
Monmouth Beach, NJ

Average humidity in September - Monmouth Beach, NJ
  • Average humidity in September: 76%

The months with the highest relative humidity are May and June (79%).
The month with the lowest relative humidity is November (73%).

Average rainfall in September
Monmouth Beach, NJ

Average rainfall in September - Monmouth Beach, NJ
  • Average rainfall in September: 0.75"

The wettest month (with the highest rainfall) is July (1.38").
The driest month (with the least rainfall) is January (0.55").

Average rainfall days in September
Monmouth Beach, NJ

Average rainfall days in September - Monmouth Beach, NJ
  • Average rainfall days in September: 11 days

The month with the highest number of rainy days is July (14.6 days).
The month with the least rainy days is November (6.8 days).

Average snowfall in September
Monmouth Beach, NJ

Average snowfall in September - Monmouth Beach, NJ
  • Average snowfall in September: 0"

The month with the highest snowfall is December (0.47").
The months with the least snowfall are April, May, June, July, August, September and November (0").

Average snowfall days in September
Monmouth Beach, NJ

Average snowfall days in September - Monmouth Beach, NJ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average sea temperature in September
Monmouth Beach, NJ

Average sea temperature in September - Monmouth Beach, NJ
  • Average sea temperature in September: 70.3°F

The best month for swimming (with the highest average sea temperature) is August (74.5°F).
The coldest month (with the lowest average sea temperature) is February (40.1°F).

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

Average daylight in September / Average sunshine in September - Monmouth Beach, 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 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 48min).

Average sunshine days in September
Monmouth Beach, NJ

Average sunshine days in September - Monmouth Beach, NJ
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is July (14.3 days).

Average UV index in September
Monmouth Beach, NJ

Average UV index in September - Monmouth Beach, NJ
  • Average UV index in September: 5

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).

Average cloud cover in September
Monmouth Beach, NJ

Average cloud cover in September - Monmouth Beach, NJ
  • Average cloud cover in September: 33

The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September
Monmouth Beach, NJ

Average visibility in September - Monmouth Beach, 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).

Monmouth Beach, New Jersey, USA

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