September weather forecast and climate
Edison, NJ

September, the first month of the autumn, in Edison, is also a moderately hot month, with average temperature ranging between max 75.6°F (24.2°C) and min 60.4°F (15.8°C).

Temperature

In September, the average high-temperature marginally drops, from 82.6°F (28.1°C) in August, to a still warm 75.6°F (24.2°C). In Edison, in September, the average low-temperature is 60.4°F (15.8°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

The month with the least rainfall in Edison, New Jersey, is September when the rain falls for 12.8 days and typically collects 1.54" (39mm) of precipitation.

Snowfall

May through October are months without snowfall in Edison.

Daylight

In Edison, New Jersey, the average length of the day is 12.4h.

Sunshine

The average sunshine in September is 8.6h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.

What is the temperature in September in Edison?

In Edison, in September, the average high-temperature is 75.6°F (24.2°C), and the average low-temperature is 60.4°F (15.8°C).

What is the average humidity in September in Edison?

The average relative humidity in September is 75%.

How many days does it rain in September in Edison?

In Edison, New Jersey, in September, it is raining for 12.8 days, with typically 1.54" (39mm) of accumulated precipitation.

What is the driest month in Edison?

September is the month with the least rainfall in Edison, New Jersey. Rain falls for 12.8 days and accumulates 1.54" (39mm) of precipitation.

When it does not snow in Edison?

In Edison snow does not fall in May through October.

What is the average length of the day in September in Edison?

In September, the average length of the day is 12.4h.

How long on average sun shines in September in Edison?

In Edison, New Jersey, the average sunshine in September is 8.6h.

What is the UV index reading in September in Edison?

The average daily maximum UV index in September in Edison, New Jersey, is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Edison, NJ
  • Average high temperature in September: 24.2°C

The warmest month (with the highest average high temperature) is July (28.9°C).
The month with the lowest average high temperature is January (2.6°C).

  • Average low temperature in September: 15.8°C

The month with the highest average low temperature is July (20.1°C).
The coldest month (with the lowest average low temperature) is January (-3.9°C).

Average pressure in September - Edison, NJ
  • Average pressure in September: 1017.7mbar

The month with the highest atmospheric pressure is November (1019.6mbar).
The month with the lowest atmospheric pressure is June (1013.7mbar).

Average wind speed in September - Edison, NJ
  • Average wind speed in September: 10.5km/h

The windiest month (with the highest average wind speed) is March (14.9km/h).
The calmest months (with the lowest average wind speed) are July and August (9.7km/h).

Average humidity in September - Edison, NJ
  • Average humidity in September: 75%

Months with the highest relative humidity are February, October and December (77%).
The month with the lowest relative humidity is August (72%).

Average rainfall in September - Edison, NJ
  • Average rainfall in September: 39mm

The wettest month (with the highest rainfall) is July (78mm).
The driest month (with the least rainfall) is September (39mm).

Average rainfall days in September - Edison, NJ
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in September - Edison, NJ
  • Average snowfall in September: 0mm

The month with the highest snowfall is March (83mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in September - Edison, NJ
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.6 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Edison, NJ
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 8.6h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is February (Average sunshine: 4.6h).

Average sunshine days in September - Edison, NJ
  • Average sunshine days in September: 14.7 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.3 days).

Average UV index in September - Edison, NJ
  • Average UV index in September: 5

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in September - Edison, NJ
  • Average cloud cover in September: 38

Months with the most cloud cover are February and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in September - Edison, NJ
  • Average visibility in September: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).