September weather forecast
Mamaroneck, NY

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Weather in September

September, the first month of the autumn in Mamaroneck, is still a warm month, with an average temperature fluctuating between 74.5°F (23.6°C) and 61.7°F (16.5°C).

Temperature

September signifies a gentle decline in Mamaroneck's average high-temperature, easing from 81.3°F (27.4°C) in August to a still moderately hot 74.5°F (23.6°C). An average low-temperature of 61.7°F (16.5°C) is recorded in the month of September in Mamaroneck.

Humidity

In September, the average relative humidity in Mamaroneck is 73%.

Rainfall

In Mamaroneck, in September, during 12.9 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. Throughout the year, there are 150.3 rainfall days, and 27.72" (704mm) of precipitation is accumulated.

Snowfall

In Mamaroneck, snow does not fall in May through October.

Ocean temperature

In Mamaroneck, the average seawater temperature in September is 70.2°F (21.2°C).
Note: For the majority, swimming in water with a temperature of 70.2°F (21.2°C) is not enjoyable. The difficulty in managing breathing rises as the temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

The average length of the day in September in Mamaroneck is 12h and 28min.
On the first day of the month, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:38 pm EDT.

Sunshine

The average sunshine in September in Mamaroneck is 8.9h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: An average maximum UV index of 5 in September leads to these recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Caution! The reflection of sand and water significantly amplifies the Sun's UV radiation.
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Frequently asked questions

What is the usual temperature for Mamaroneck in September?

An average high-temperature, in September, in Mamaroneck, is 74.5°F (23.6°C) and the average low-temperature is 61.7°F (16.5°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, is appraised at 86°F (30°C).

What is the average humidity in September in Mamaroneck?

The average relative humidity in September in Mamaroneck, New York, is 73%.

How many days does it rain in September in Mamaroneck?

In Mamaroneck, New York, in September, during 12.9 rainfall days, 1.85" (47mm) of precipitation is typically accumulated.

When it does not snow in Mamaroneck?

May through October are months without snowfall.

How cold is the water in September in Mamaroneck?

In September, the average ocean temperature in Mamaroneck is 70.2°F (21.2°C). For swimming, a surface water temperature of 70.2°F (21.2°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

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

In Mamaroneck, the average day length in September is 12h and 28min.

When is the sunrise / sunset in September in Mamaroneck?

In September, on the first day of the month, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of the month, in Mamaroneck, sunrise is at 6:51 am and sunset at 6:38 pm EDT.

How many hours of sunshine does Mamaroneck have in September?

In Mamaroneck, New York, the average sunshine duration in September is 8.9h.

What is the UV index intensity in September in Mamaroneck?

In September, the average daily maximum UV index in Mamaroneck, New York, is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from 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
Mamaroneck, NY

Average temperature in September - Mamaroneck, NY
  • Average high temperature in September: 74.5°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (36.3°F).

  • Average low temperature in September: 61.7°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).

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Average pressure in September
Mamaroneck, NY

Average pressure in September - Mamaroneck, NY
  • Average pressure in September: 30.05"Hg

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

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Average wind speed in September
Mamaroneck, NY

Average wind speed in September - Mamaroneck, NY
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

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Average humidity in September
Mamaroneck, NY

Average humidity in September - Mamaroneck, NY
  • Average humidity in September: 73%

The months with the highest relative humidity are February and December (75%).
The month with the lowest relative humidity is August (70%).

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Average rainfall in September
Mamaroneck, NY

Average rainfall in September - Mamaroneck, NY
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is July (3.23").
The driest months (with the least rainfall) are January and February (1.69").

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Average rainfall days in September
Mamaroneck, NY

Average rainfall days in September - Mamaroneck, NY
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (7.3 days).

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Average snowfall in September
Mamaroneck, NY

Average snowfall in September - Mamaroneck, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.8").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Mamaroneck, NY

Average snowfall days in September - Mamaroneck, NY
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in September
Mamaroneck, NY

Average sea temperature in September - Mamaroneck, NY
  • Average sea temperature in September: 70.1°F

The best month for swimming (with the highest average sea temperature) is August (74.1°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

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Average daylight in September /
Average sunshine in September
Mamaroneck, NY

Average daylight in September / Average sunshine in September - Mamaroneck, NY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
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 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days in September
Mamaroneck, NY

Average sunshine days in September - Mamaroneck, NY
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is January (19.6 days).
The month with the least sunshine days is July (12 days).

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Average UV index in September
Mamaroneck, NY

Average UV index in September - Mamaroneck, NY
  • Average UV index in September: 5

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).

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Average cloud cover in September
Mamaroneck, NY

Average cloud cover in September - Mamaroneck, NY
  • Average cloud cover in September: 34

The months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in September
Mamaroneck, NY

Average visibility in September - Mamaroneck, NY
  • Average visibility in September: 6mi

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

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Mamaroneck, New York, USA

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