September weather forecast
Cape Cod National Seashore, MA

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Weather in September

September brings a changing wind to Cape Cod National Seashore as summer cools off and autumn approaches. The month's sea temperatures retreat slightly to an average of 64.3°F (17.9°C). Daylight hours continue to shrink, dropping to nearly half of July's length. Abutting August's summer and October's autumn, September is a transition that signals the end of warm days.

Ocean temperature

In September, the average ocean temperature is 64.2°F (17.9°C).
Note: The majority of individuals do not enjoy swimming in water that is 64.2°F (17.9°C). Breathing control becomes more challenging as the water temperature dips from 69.8°F (21°C) to 59°F (15°C).

Daylight

In Cape Cod National Seashore, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:06 am and sunset at 7:13 pm. On the last day of September, in Cape Cod National Seashore, sunrise is at 6:36 am and sunset at 6:22 pm EDT.
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Frequently asked questions

How cold is the water in September in Cape Cod National Seashore?

In Cape Cod National Seashore, Massachusetts, in September, the average water temperature is 64.2°F (17.9°C). For most, swimming in 64.2°F (17.9°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

How many hours of daylight does Cape Cod National Seashore have in September?

The average day length in September is 12h and 28min.

When is the sunrise / sunset in September in Cape Cod National Seashore?

In September, on the first day of the month, sunrise is at 6:06 am and sunset at 7:13 pm. On the last day of the month, in Cape Cod National Seashore, sunrise is at 6:36 am and sunset at 6:22 pm EDT.

Average sea temperature in September
Cape Cod National Seashore, MA

Average sea temperature in September - Cape Cod National Seashore, MA
  • Average sea temperature in September: 64.3°F

The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).

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Average daylight in September
Cape Cod National Seashore, MA

Average daylight in September - Cape Cod National Seashore, 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).

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Cape Cod National Seashore, Massachusetts, USA

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