September weather forecast
Rocky Hill, NJ

Share

Weather in September

September, the first month of the autumn in Rocky Hill, is still a warm month, with an average temperature ranging between min 59°F (15°C) and max 75.7°F (24.3°C).

Temperature

The beginning of September brings a slight decrease in the average high-temperature, transitioning from 82.9°F (28.3°C) in August to a still moderately hot 75.7°F (24.3°C). During the nights in September, Rocky Hill observes an average low-temperature of 59°F (15°C).

Humidity

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

Rainfall

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

Snowfall

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

Daylight

In Rocky Hill, 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 7:30 pm. On the last day of September, in Rocky Hill, New Jersey, sunrise is at 6:54 am and sunset at 6:41 pm EDT.

Sunshine

In September, the average sunshine in Rocky Hill is 8.8h.

UV index

In Rocky Hill, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In September, an average UV index of 4 transforms into the following instructions:
Act with care - Obligation to protect against skin and eye damage is highlighted. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
[Resources]

Frequently asked questions

What is the average September temperature in Rocky Hill?

The average high-temperature and low-temperature in Rocky Hill, New Jersey, during September are 75.7°F (24.3°C) and 59°F (15°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 89.6°F (32°C).

What is the average humidity in September in Rocky Hill?

The average relative humidity in September in Rocky Hill is 77%.

What is the driest month in Rocky Hill?

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

How many days does it rain in September in Rocky Hill?

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

When it does not snow in Rocky Hill?

In Rocky Hill, snow does not fall in June through October.

How many hours of daylight does Rocky Hill have in September?

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

When are sunrise and sunset in September in Rocky Hill?

In September, on the first day of the month, sunrise is at 6:26 am and sunset at 7:30 pm. On the last day of the month, in Rocky Hill, New Jersey, sunrise is at 6:54 am and sunset at 6:41 pm EDT.

How long on average sun shines in September in Rocky Hill?

The average sunshine duration in September in Rocky Hill is 8.8h.

What is the UV index reading in September in Rocky Hill?

In Rocky Hill, New Jersey, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes 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
Rocky Hill, NJ

Average temperature in September - Rocky Hill, 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
Rocky Hill, NJ

Average pressure in September - Rocky Hill, 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
Rocky Hill, NJ

Average wind speed in September - Rocky Hill, 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
Rocky Hill, NJ

Average humidity in September - Rocky Hill, 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
Rocky Hill, NJ

Average rainfall in September - Rocky Hill, 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
Rocky Hill, NJ

Average rainfall days in September - Rocky Hill, 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
Rocky Hill, NJ

Average snowfall in September - Rocky Hill, 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
Rocky Hill, NJ

Average snowfall days in September - Rocky Hill, 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
Rocky Hill, NJ

Average daylight in September / Average sunshine in September - Rocky Hill, 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
Rocky Hill, NJ

Average sunshine days in September - Rocky Hill, 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
Rocky Hill, NJ

Average UV index in September - Rocky Hill, 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
Rocky Hill, NJ

Average cloud cover in September - Rocky Hill, 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
Rocky Hill, NJ

Average visibility in September - Rocky Hill, 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]

Rocky Hill, New Jersey, USA

Weather forecast for your location

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