September weather forecast
Provincetown, MA

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Residential homes along the scenic shores of Provincetown in Cape Cod, Massachusetts
Residential homes along the scenic shores of Provincetown in Cape Cod, Massachusetts

Weather in September

September in Provincetown, Massachusetts marks the beginning of a cool shift as the summer warmth starts to dissipate, with temperatures falling to 66.4°F (19.1°C). Rainfall frequency declines from August, keeping the city relatively drier. Longer sunny hours prevail despite the shortening days, bestowing plenty of time for outdoor activities. Mild wind and reduced rainfall make September an ideal time for a plethora of events, from beach fun to bird watching. Sea temperatures remain at a comfortable level for water sports or leisure swimming.

Temperature

Provincetown's September weather features a light decline in high-temperatures, reducing from a pleasant 71.8°F (22.1°C) in August to a comfortable 66.4°F (19.1°C). An average low-temperature of 61.9°F (16.6°C) characterizes Provincetown's September nights.

Humidity

In Provincetown, the average relative humidity in September is 80%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.7 days and accumulates 2.17" (55mm) of precipitation.

Snowfall

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

Ocean temperature

In September, the average ocean temperature is 63.7°F (17.6°C).
Note: For the majority of people, swimming in water at 63.7°F (17.6°C) is not enjoyable. The challenge of controlling breathing escalates 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 Provincetown is 12h and 28min.
On the first day of September in Provincetown, sunrise is at 6:07 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 6:23 pm EDT.

Sunshine

The average sunshine in September in Provincetown is 8.6h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, a regular UV index of 4 translates into these guidelines:
Act with care - Obligation to protect against skin and eye damage is highlighted. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
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Frequently asked questions

What is the temperature in September in Provincetown?

The high-temperature, in September, in Provincetown, is 66.4°F (19.1°C), while the low-temperature averages to 61.9°F (16.6°C).

What is the average humidity in September in Provincetown?

In Provincetown, the average relative humidity in September is 80%.

What is the driest month in Provincetown?

The month with the least rainfall in Provincetown, Massachusetts, is September, when the rain falls for 12.7 days and typically collects 2.17" (55mm) of precipitation.

How many days does it rain in September in Provincetown?

In Provincetown, during September, the rain falls for 12.7 days and regularly aggregates up to 2.17" (55mm) of precipitation.

When it does not snow in Provincetown?

In Provincetown, Massachusetts, snow does not fall in May through October.

What is the ocean temperature in September in Provincetown?

In Provincetown, in September, the average water temperature is 63.7°F (17.6°C). For swimming, a surface water temperature of 63.7°F (17.6°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 Provincetown?

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

When is the sunrise / sunset in September in Provincetown?

On the first day of September, sunrise is at 6:07 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 6:23 pm EDT.

How many hours of sunshine does Provincetown have in September?

In September, the average sunshine duration is 8.6h.

What is the UV index reading in September in Provincetown?

The average daily maximum UV index in September in Provincetown is 4. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
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
Provincetown, MA

Average temperature in September - Provincetown, MA
  • Average high temperature in September: 66.4°F

The warmest month (with the highest average high temperature) is August (71.8°F).
The month with the lowest average high temperature is January (37.6°F).

  • Average low temperature in September: 61.9°F

The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).

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Average pressure in September
Provincetown, MA

Average pressure in September - Provincetown, 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 (29.93"Hg).

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Average wind speed in September
Provincetown, MA

Average wind speed in September - Provincetown, MA
  • Average wind speed in September: 12.6mph

The windiest month (with the highest average wind speed) is January (17.8mph).
The calmest month (with the lowest average wind speed) is August (10.9mph).

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Average humidity in September
Provincetown, MA

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

The months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is November (74%).

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Average rainfall in September
Provincetown, MA

Average rainfall in September - Provincetown, MA
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is December (3.39").
The driest month (with the least rainfall) is September (2.17").

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Average rainfall days in September
Provincetown, MA

Average rainfall days in September - Provincetown, MA
  • Average rainfall days in September: 12.7 days

The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is February (8.6 days).

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Average snowfall in September
Provincetown, MA

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

The month with the highest snowfall is February (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Provincetown, MA

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

The month with the highest number of snowfall days is January (6.3 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
Provincetown, MA

Average sea temperature in September - Provincetown, MA
  • Average sea temperature in September: 63.7°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 March (39°F).

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

Average daylight in September / Average sunshine in September - Provincetown, MA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 24min).

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Average sunshine days in September
Provincetown, MA

Average sunshine days in September - Provincetown, MA
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is July (12.6 days).

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Average UV index in September
Provincetown, MA

Average UV index in September - Provincetown, MA
  • Average UV index in September: 4

The month with the highest UV index is July (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
Provincetown, MA

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

The month with the most cloud cover is December (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 28).

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Average visibility in September
Provincetown, MA

Average visibility in September - Provincetown, 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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Provincetown, Massachusetts, USA

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