September weather forecast
Rocky Hill, NJ

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Weather in September

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

Temperature

Rocky Hill's progression into September involves a minor drop in the average high-temperature, slightly receding from a warm 82.9°F (28.3°C) in August to a still moderately hot 75.7°F (24.3°C). Nighttime temperature lowers to an average of 59°F (15°C) in September.

Humidity

The average relative humidity in September is 77%.

Rainfall

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

Snowfall

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

Daylight

The average length of the day in September is 12h and 27min.
On the first day of September, sunrise is at 6:26 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 6:41 pm EDT.

Sunshine

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

UV index

In Rocky Hill, the average daily maximum UV index in September is 4. A UV Index reading 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 in September translates into these instructions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September in Rocky Hill?

Rocky Hill in September has an average high-temperature of 75.7°F (24.3°C) and an average low-temperature of 59°F (15°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is estimated at 89.6°F (32°C).

What is the average humidity in September?

The average relative humidity in September is 77%.

What is the driest month?

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 September, the rain falls for 10 days. Throughout September, 0.67" (17mm) of precipitation is accumulated.

When it does not snow?

June through October are months without snowfall.

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

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

What time are sunrise and sunset in September?

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, sunrise is at 6:54 am and sunset at 6:41 pm EDT.

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

In September, the average sunshine duration is 8.8h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health 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
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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

Rocky Hill, New Jersey, USA

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