September weather forecast
Florham Park, NJ

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Weather in September

The first month of the autumn, September, is still a warm month in Florham Park, New Jersey, with an average temperature varying between 57.6°F (14.2°C) and 74.5°F (23.6°C).

Temperature

Florham Park experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a moderately hot 81.9°F (27.7°C) in August to a still warm 74.5°F (23.6°C). In September, the nighttime temperature lowers to an average of 57.6°F (14.2°C).

Humidity

In September, the average relative humidity 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

In Florham Park, snow does not fall in June through September.

Daylight

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

Sunshine

In September, the average sunshine is 8.5h.

UV index

In Florham Park, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: A daily maximum UV index of 4 in September translates into the following instructions:
Act with care - The need to guard against sun damage is communicated. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Updated: Jul 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

In Florham Park, 74.5°F (23.6°C) is the average high-temperature and 57.6°F (14.2°C) is the average low-temperature during September. In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 87.8°F (31°C).

What is the average humidity in September?

In September, the average relative humidity is 77%.

What is the driest month?

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

How much does it rain in September?

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

When it does not snow?

June through September are months without snowfall in Florham Park.

Does it snow in September?

In Florham Park, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Florham Park?

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

When is the sunrise / sunset in September?

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, sunrise is at 6:53 am and sunset at 6:40 pm EDT.

How long on average sun shines in September?

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

What is the UV index reading in September?

In September, the average daily maximum UV index in Florham Park is 4. A UV Index of 3 to 5 symbolizes 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
Florham Park, NJ

Average temperature in September - Florham Park, 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).

Average pressure in September
Florham Park, NJ

Average pressure in September - Florham Park, 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).

Average wind speed in September
Florham Park, NJ

Average wind speed in September - Florham Park, 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).

Average humidity in September
Florham Park, NJ

Average humidity in September - Florham Park, 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%).

Average rainfall in September
Florham Park, NJ

Average rainfall in September - Florham Park, 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").

Average rainfall days in September
Florham Park, NJ

Average rainfall days in September - Florham Park, 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).

Average snowfall in September
Florham Park, NJ

Average snowfall in September - Florham Park, 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").

Average snowfall days in September
Florham Park, NJ

Average snowfall days in September - Florham Park, 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).

Average daylight in September /
Average sunshine in September
Florham Park, NJ

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

The month with the longest days is June (Average daylight: 15h and 6min).
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).

Average sunshine days in September
Florham Park, NJ

Average sunshine days in September - Florham Park, 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).

Average UV index in September
Florham Park, NJ

Average UV index in September - Florham Park, 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).

Average cloud cover in September
Florham Park, NJ

Average cloud cover in September - Florham Park, 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).

Average visibility in September
Florham Park, NJ

Average visibility in September - Florham Park, 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).

Florham Park, New Jersey, USA

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