Weather in Cape Cod, United States in September

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Visiting Cape Cod, United States in September

September is one of the best months to visit Cape Cod for the best beach weather. It has the most sunshine and best sunbathing and swimming conditions of the year.

September has average maximum temperatures of 22°C (72°F) which is nice and warm and makes sunbathing pleasant on clear days. The sunshine percentage is 47.7% making it quite sunny but with regular periods of cloudy and overcast skies. There are 6.0 hours of sunshine per day. September has total rainfall of 9.3cm (3.7inches) making it mostly dry with only intermittent light showers. There are only 12.5 days with some rainfall so you can still enjoy the beach on the majority of days. Sea temperatures are a moderate 20°C (68°F). September is a pleasant month for swimming in Cape Cod though some people may prefer warmer water.

Also consider visiting Cape Cod in one of the other best months of June, July, August, for the best beach weather.

Also consider one of our other suggestions for September.

Can you sunbathe in Cape Cod in September?

Yes, September is a good time for sunbathing in Cape Cod.

September has average maximum temperatures of 22°C (72°F) which is nice and warm and makes sunbathing pleasant on clear days. The sunshine percentage is 47.7% making it quite sunny but with regular periods of cloudy and overcast skies. There are 6.0 hours of sunshine per day. September has total rainfall of 9.3cm (3.7inches) making it mostly dry with only intermittent light showers. There are only 12.5 days with some rainfall so you can still enjoy the beach on the majority of days.

More about September temperature and sunshine.

Can you swim in Cape Cod in September?

Yes, September is a pleasant month for swimming in Cape Cod with moderate sea temperatures 20°C (68°F).

More about September sea temperatures.

Is September a good time to holiday in Cape Cod?

Yes, September is a good time for a holiday in Cape Cod.

September has average maximum temperatures of 22°C (72°F) which is nice and warm and makes sunbathing pleasant on clear days. The sunshine percentage is 47.7% making it quite sunny but with regular periods of cloudy and overcast skies. There are 6.0 hours of sunshine per day. September has total rainfall of 9.3cm (3.7inches) making it mostly dry with only intermittent light showers. There are only 12.5 days with some rainfall so you can still enjoy the beach on the majority of days. Sea temperatures are a moderate 20°C (68°F). September is a pleasant month for swimming in Cape Cod though some people may prefer warmer water.

More about the September temperatures and sunshine.

Is Cape Cod warm in September?

Yes, Cape Cod is nice and warm and makes sunbathing pleasant on clear days in September.

The average maximum temperature in Cape Cod in September is 22°C (72°F). The average maximum temperature is 26°C (78°) in the previous month and 17°C (62°F) in the next month.

The average temperature in Cape Cod in September is 18°C (64°F). The average temperature is 21°C (70°F) in the previous month and 13°C (55°F) in the next month.

More info about the September temperatures and sunshine.

How sunny is Cape Cod in September?

The average day light hours per day in Cape Cod in September are 12.5. The sunshine percentage is 47.7% making it quite sunny but with regular periods of cloudy and overcast skies. There are 6.0 hours of sunshine per day.

More about September sunshine.

Temperature in Cape Cod in September

The average maximum temperature in Cape Cod in September is 22°C (72°F). The average maximum temperature is 26°C (78°F) in the previous month and 17°C (62°F) in the next month.

The average temperature in Cape Cod in September is 18°C (64°F). The average temperature is 21°C (70°F) in the previous month and 13°C (55°F) in the next month.

The average minimum temperature in Cape Cod in September is 14°C (56°F). The minimum temperature is 17°C (63°F) in the previous month and 9°C (48°F) in the next month.

Sunshine in Cape Cod in September

During September the average day light hours are 12.5 per day in Cape Cod. The sunshine percentage is 47.7% making it quite sunny but with regular periods of cloudy and overcast skies. There are 6.0 hours of sunshine per day.

The ultraviolet index in Cape Cod in September is typically 6.3 during September. An ultraviolet index reading of 6 to 7 indicates a high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 20 minutes. Protection against skin and eye damage is needed. Tanning will be safest before 10am and after 4pm. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.

Sea Temperature in Cape Cod in September

The average sea water temperature in Cape Cod in September is 20.2°C (68.4°F) which is comfortable for swimming though some may prefer warmer water.

Rainfall in Cape Cod in September

The average total rainfall in Cape Cod in September is 9.3cm (3.7inches) and on average there are 12.5 rainy days in September making it a pretty wet time to visit the beach.

Humidity in Cape Cod in September

The maximum dew point (an indicator of humidity) in Cape Cod in September is 17°C (62°F) which is OK for most but slightly uncomfortable for some. The dew point is 19°C (67°F) in the previous month and 12°C (12°F) in the next month.

The average maximum relative humidity in Cape Cod in September is typically 93.3%. The maximum relative humidity is 94.2% in the previous month and 91% in the next month.

The average relative humidity in Cape Cod in September is typically 78.7%. The average relative humidity is 80.1% in the previous month and 76.7% in the next month.

Wind Speed in Cape Cod in September

The average maximum wind speed in Cape Cod in September is typically 22KM/H (14MPH). The average maximum wind speed is 20KM/H (13MPH) in the previous month and 24KM/H (15MPH) in the next month.

The average wind speed in Cape Cod in September is typically 11KM/H (7MPH). The average wind speed is 10KM/H (6MPH) in the previous month and 13KM/H (8MPH) in the next month.

The average wind direction in Cape Cod in September is from the West-Southwest.

Monthly Averages

Suggested Beaches in September

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Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.

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Need Inspiration?

Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.