September weather forecast and climate
Mahwah, NJ

Weather in September

The first month of the autumn, September, is still a warm month in Mahwah, New Jersey, with average temperature fluctuating between 74.8°F (23.8°C) and 56.8°F (13.8°C).

Temperature

In Mahwah, the average high-temperature in September slightly decreases, from 82.4°F (28°C) in August, to a still moderately hot 74.8°F (23.8°C). In September, the average low-temperature is 56.8°F (13.8°C).

Humidity

In September, the average relative humidity in Mahwah, New Jersey, is 76%.

Rainfall

September is the month with the least rainfall. Rain falls for 11 days and accumulates 1.34" (34mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in Mahwah is 12.4h.

Sunshine

The average sunshine in Mahwah, New Jersey, is 8.7h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Mahwah?

In Mahwah, in September, the average high-temperature is 74.8°F (23.8°C), and the average low-temperature is 56.8°F (13.8°C).

What is the average humidity in September in Mahwah?

In September, the average relative humidity is 76%.

How many days does it rain in September in Mahwah?

In Mahwah, during September, the rain falls for 11 days and regularly aggregates up to 1.34" (34mm) of precipitation.

What is the driest month in Mahwah?

The month with the least rainfall in Mahwah, New Jersey, is September when the rain falls for 11 days and typically collects 1.34" (34mm) of precipitation.

Does it snow in Mahwah in September?

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

When it does not snow in Mahwah?

June through September are months without snowfall.

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

The average length of the day in September is 12.4h.

How many hours of sunshine does Mahwah have in September?

The average sunshine in September in Mahwah, New Jersey, is 8.7h.

What is the UV index reading in September in Mahwah?

In Mahwah, New Jersey, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Mahwah, NJ

Average temperature in September - Mahwah, NJ
  • Average high temperature in September: 74.8°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 (34.3°F).

  • Average low temperature in September: 56.8°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).

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Average pressure in September
Mahwah, NJ

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

The month with the highest atmospheric pressure is November (30.1").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in September
Mahwah, NJ

Average wind speed in September - Mahwah, NJ
  • Average wind speed in September: 5.5mph

The windiest month (with the highest average wind speed) is March (7.7mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in September
Mahwah, NJ

Average humidity in September - Mahwah, NJ
  • Average humidity in September: 76%

Months with the highest relative humidity are February and December (79%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in September
Mahwah, NJ

Average rainfall in September - Mahwah, NJ
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is December (2.68").
The driest month (with the least rainfall) is September (1.34").

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Average rainfall days in September
Mahwah, NJ

Average rainfall days in September - Mahwah, NJ
  • Average rainfall days in September: 11 days

The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in September
Mahwah, NJ

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

The month with the highest snowfall is February (2.91").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Mahwah, NJ

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

The month with the highest number of snowfall days is February (7.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Mahwah, 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: 8.7h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is February (Average sunshine: 4.5h).

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Average sunshine days in September
Mahwah, NJ

Average sunshine days in September - Mahwah, NJ
  • Average sunshine days in September: 16.3 days

The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is June (11.8 days).

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Average UV index in September
Mahwah, NJ

Average UV index in September - Mahwah, 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
Mahwah, NJ

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

Months with the most cloud cover are February and March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in September
Mahwah, NJ

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

Months with the highest visibility are January, March, April, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are February and May (5mi).

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