September weather forecast and climate
Montclair, NJ

Weather in September

September, the first month of the autumn, in Montclair, is also a moderately hot month, with average temperature ranging between min 59.4°F (15.2°C) and max 75°F (23.9°C).

Temperature

In Montclair, the average high-temperature slightly decreases, from 81.9°F (27.7°C) in August, to a still warm 75°F (23.9°C). The average low-temperature, in Montclair, is 59.4°F (15.2°C).

Humidity

In Montclair, the average relative humidity in September is 75%.

Rainfall

In Montclair, in September, it is raining for 13.2 days, with typically 1.46" (37mm) of accumulated precipitation. Throughout the year, in Montclair, there are 153.3 rainfall days, and 24.92" (633mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

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

Sunshine

The average sunshine in September is 8.8h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the average humidity in September in Montclair?

The average relative humidity in September in Montclair is 75%.

How much does it rain in Montclair in September?

In September, in Montclair, New Jersey, the rain falls for 13.2 days. Throughout September, 1.46" (37mm) of precipitation is accumulated.

When it does not snow in Montclair?

May through October are months without snowfall in Montclair.

How many hours of daylight does Montclair have in September?

In Montclair, New Jersey, the average length of the day in September is 12.4h.

How long on average sun shines in September in Montclair?

The average sunshine in September in Montclair, New Jersey, is 8.8h.

How high is the UV index in September in Montclair?

In September, the average daily maximum UV index in Montclair is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Montclair, NJ

Average temperature in September - Montclair, NJ
  • Average high temperature in September: 75°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in September: 59.4°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

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Average pressure in September
Montclair, NJ

Average pressure in September - Montclair, NJ
  • Average pressure in September: 30.06"

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in September
Montclair, NJ

Average wind speed in September - Montclair, NJ
  • Average wind speed in September: 6.3mph

The windiest months (with the highest average wind speed) are January and March (8.8mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).

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Average humidity in September
Montclair, NJ

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

The month with the highest relative humidity is February (78%).
Months with the lowest relative humidity are April and August (72%).

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Average rainfall in September
Montclair, NJ

Average rainfall in September - Montclair, NJ
  • Average rainfall in September: 1.46"

The wettest month (with the highest rainfall) is July (3.07").
The driest month (with the least rainfall) is January (1.38").

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Average rainfall days in September
Montclair, NJ

Average rainfall days in September - Montclair, NJ
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (7.6 days).

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Average snowfall in September
Montclair, NJ

Average snowfall in September - Montclair, NJ
  • Average snowfall in September: 0"

The month with the highest snowfall is March (3.27").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Montclair, NJ

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

The month with the highest number of snowfall days is February (6.8 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Montclair, NJ

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

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 8.8h

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.7h).

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Average sunshine days in September
Montclair, NJ

Average sunshine days in September - Montclair, NJ
  • Average sunshine days in September: 14.1 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (10.7 days).

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Average UV index in September
Montclair, NJ

Average UV index in September - Montclair, NJ
  • Average UV index in September: 4

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

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Average cloud cover in September
Montclair, NJ

Average cloud cover in September - Montclair, NJ
  • Average cloud cover in September: 36

Months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in September
Montclair, NJ

Average visibility in September - Montclair, NJ
  • Average visibility in September: 6mi

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).

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