September weather forecast
Nantucket, MA

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Beautiful homes built on the water overlooking the boats on the water below, in Nantucket, Massachusetts
Beautiful homes built on the water overlooking the boats on the water below, in Nantucket, Massachusetts

Weather in September

September brings the onset of fall in Nantucket, demonstrating a decrease in the average high temperature down to 67.6°F. However, the drop in temperature does not dampen local spirits or curtail outdoor activities. The beauty of fall foliage begins to show this month, giving the city a unique character. Rainfall picks up gradually in comparison to the summer months, and the sunshine hours begin to reduce. September provides a gentler, yet still warm, weather environment, perfect for exploring Nantucket's leaf-peeping routes.

Temperature

As September unfolds in Nantucket, the average high-temperature reaches an enjoyable 67.6°F, hinting at a slight fluctuation from the previous month. Nantucket, during September nights, experiences a subtle shift to a low average of 63.9°F from the day's heat.

Humidity

In September, the average relative humidity is 80%.

Rainfall

In Nantucket, during September, the rain falls for 11.7 days and regularly aggregates up to 2.2" of precipitation. In Nantucket, during the entire year, the rain falls for 153 days and collects up to 26.61" of precipitation.

Snowfall

April through October are months without snowfall.

Ocean temperature

In September, the average ocean temperature in Nantucket, Massachusetts, is 65.1°F.
Note: For the majority, swimming in water with a temperature of 65.1°F is not enjoyable. The difficulty in managing breathing rises as the temperature decreases from 69.8°F to 59°F.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of September, sunrise is at 6:06 am and sunset at 7:14 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 6:24 pm EDT.

Sunshine

In Nantucket, the average sunshine in September is 8.6h.

UV index

In Nantucket, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In September, a daily UV index of 5 turns into the following recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. It's recommended to limit sun exposure when its radiation is at its peak during midday. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
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FAQ

What is the temperature in September in Nantucket?

The high-temperature in Nantucket, Massachusetts, during September is 67.6°F and the low-temperature is 63.9°F.

What is the average humidity in September in Nantucket?

The average relative humidity in September in Nantucket is 80%.

How much does it rain in Nantucket in September?

In Nantucket, Massachusetts, during September, the rain falls for 11.7 days and regularly aggregates up to 2.2" of precipitation.

When it does not snow in Nantucket?

April through October are months without snowfall in Nantucket, Massachusetts.

What is the ocean temperature in September in Nantucket?

In Nantucket, in September, the average water temperature is 65.1°F. Swimming in 65.1°F is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F.

How many hours of daylight does Nantucket have in September?

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

When is the sunrise / sunset in September in Nantucket?

On the first day of September, sunrise is at 6:06 am and sunset at 7:14 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 6:24 pm EDT.

How many hours of sunshine does Nantucket have in September?

The average sunshine duration in September in Nantucket, Massachusetts, is 8.6h.

What is the UV index reading in September in Nantucket?

In September, the average daily maximum UV index in Nantucket, Massachusetts, is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Nantucket, MA

Average temperature in September - Nantucket, MA
  • Average high temperature in September: 67.6°F

The warmest month (with the highest average high temperature) is August (72.1°F).
The month with the lowest average high temperature is February (39.7°F).

  • Average low temperature in September: 63.9°F

The month with the highest average low temperature is August (68.7°F).
The coldest month (with the lowest average low temperature) is February (32.5°F).

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Average pressure in September
Nantucket, MA

Average pressure in September - Nantucket, MA
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in September
Nantucket, MA

Average wind speed in September - Nantucket, MA
  • Average wind speed in September: 14mph

The windiest month (with the highest average wind speed) is January (18.5mph).
The calmest month (with the lowest average wind speed) is August (11.8mph).

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Average humidity in September
Nantucket, MA

Average humidity in September - Nantucket, MA
  • Average humidity in September: 80%

The month with the highest relative humidity is July (86%).
The months with the lowest relative humidity are January, November and December (75%).

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Average rainfall in September
Nantucket, MA

Average rainfall in September - Nantucket, MA
  • Average rainfall in September: 2.2"

The wettest month (with the highest rainfall) is October (3.27").
The driest month (with the least rainfall) is November (1.77").

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Average rainfall days in September
Nantucket, MA

Average rainfall days in September - Nantucket, MA
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is February (9.2 days).

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Average snowfall in September
Nantucket, MA

Average snowfall in September - Nantucket, MA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.06").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Nantucket, MA

Average snowfall days in September - Nantucket, MA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.8 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
Nantucket, MA

Average sea temperature in September - Nantucket, MA
  • Average sea temperature in September: 65.1°F

The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is February (37.9°F).

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Average daylight in September /
Average sunshine in September
Nantucket, MA

Average daylight in September / Average sunshine in September - Nantucket, MA
  • 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 4min

The months with the most sunshine are July and August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).

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Average sunshine days in September
Nantucket, MA

Average sunshine days in September - Nantucket, MA
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is August (16.5 days).
The month with the least sunshine days is January (11.3 days).

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Average UV index in September
Nantucket, MA

Average UV index in September - Nantucket, MA
  • Average UV index in September: 5

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

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Average cloud cover in September
Nantucket, MA

Average cloud cover in September - Nantucket, MA
  • Average cloud cover in September: 32

The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in September
Nantucket, MA

Average visibility in September - Nantucket, MA
  • 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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Nantucket, Massachusetts, USA

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