September weather forecast
South Duxbury, MA

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Weather in September

The first month of the autumn, September, is still a pleasant month in South Duxbury, Massachusetts, with an average temperature ranging between min 59.9°F (15.5°C) and max 69.3°F (20.7°C).

Temperature

In South Duxbury, entering September brings a subtle temperature decrement, reducing from August's moderately hot 75.7°F (24.3°C) to an agreeable 69.3°F (20.7°C). In South Duxbury, September is marked by an average low-temperature of 59.9°F (15.5°C).

Humidity

In September, the average relative humidity in South Duxbury is 78%.

Rainfall

In South Duxbury, in September, it is raining for 10.1 days, with typically 0.83" (21mm) of accumulated precipitation. In South Duxbury, during the entire year, the rain falls for 120.2 days and collects up to 12.24" (311mm) of precipitation.

Snowfall

May through October are months without snowfall.

Ocean temperature

In September, the average ocean temperature is 64°F (17.8°C).
Note: Swimming becomes less enjoyable for most at a surface water temperature of 64°F (17.8°C). As the temperature decreases below 69.8°F (21°C), breathing becomes increasingly difficult.

Daylight

In South Duxbury, Massachusetts, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:09 am and sunset at 7:15 pm. On the last day of September, sunrise is at 6:39 am and sunset at 6:25 pm EDT.

Sunshine

In South Duxbury, the average sunshine in September is 8.6h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 4 during September translates into these guidelines:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
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Frequently asked questions

What is the average September temperature in South Duxbury?

The high-temperature, in September, in South Duxbury, is 69.3°F (20.7°C), while the low-temperature averages to 59.9°F (15.5°C).

What is the average humidity in September in South Duxbury?

In South Duxbury, Massachusetts, the average relative humidity in September is 78%.

How many days does it rain in September in South Duxbury?

In South Duxbury, Massachusetts, in September, during 10.1 rainfall days, 0.83" (21mm) of precipitation is typically accumulated.

When it does not snow in South Duxbury?

May through October are months without snowfall in South Duxbury, Massachusetts.

How cold is the water in September in South Duxbury?

In September, the average ocean temperature is 64°F (17.8°C). For swimming, a surface water temperature of 64°F (17.8°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 South Duxbury?

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

When is the sunrise / sunset in September in South Duxbury?

In September, on the first day of the month, sunrise is at 6:09 am and sunset at 7:15 pm. On the last day of the month, in South Duxbury, sunrise is at 6:39 am and sunset at 6:25 pm EDT.

How long on average sun shines in September in South Duxbury?

The average sunshine duration in September is 8.6h.

What is the UV index reading in September in South Duxbury?

In South Duxbury, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to 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
South Duxbury, MA

Average temperature in September - South Duxbury, MA
  • Average high temperature in September: 69.3°F

The warmest months (with the highest average high temperature) are July and August (75.7°F).
The month with the lowest average high temperature is January (35.8°F).

  • Average low temperature in September: 59.9°F

The months with the highest average low temperature are July and August (65.8°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

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Average pressure in September
South Duxbury, MA

Average pressure in September - South Duxbury, 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
South Duxbury, MA

Average wind speed in September - South Duxbury, MA
  • Average wind speed in September: 9.4mph

The windiest month (with the highest average wind speed) is January (13mph).
The calmest month (with the lowest average wind speed) is August (8.1mph).

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Average humidity in September
South Duxbury, MA

Average humidity in September - South Duxbury, MA
  • Average humidity in September: 78%

The months with the highest relative humidity are June and July (80%).
The months with the lowest relative humidity are March and November (74%).

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Average rainfall in September
South Duxbury, MA

Average rainfall in September - South Duxbury, MA
  • Average rainfall in September: 0.83"

The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is February (0.75").

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Average rainfall days in September
South Duxbury, MA

Average rainfall days in September - South Duxbury, MA
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is July (13.2 days).
The month with the least rainy days is February (6.3 days).

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Average snowfall in September
South Duxbury, MA

Average snowfall in September - South Duxbury, MA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.98").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
South Duxbury, MA

Average snowfall days in September - South Duxbury, MA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in September
South Duxbury, MA

Average sea temperature in September - South Duxbury, MA
  • Average sea temperature in September: 64°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 (38.8°F).

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Average daylight in September /
Average sunshine in September
South Duxbury, MA

Average daylight in September / Average sunshine in September - South Duxbury, 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 months with the least sunshine are February and December (Average sunshine: 4h and 42min).

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Average sunshine days in September
South Duxbury, MA

Average sunshine days in September - South Duxbury, MA
  • Average sunshine days in September: 18.5 days

The month with the most sunshine days is December (18.9 days).
The month with the least sunshine days is July (15.7 days).

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Average UV index in September
South Duxbury, MA

Average UV index in September - South Duxbury, MA
  • Average UV index in September: 4

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, November and December (UV index 2).

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Average cloud cover in September
South Duxbury, MA

Average cloud cover in September - South Duxbury, MA
  • Average cloud cover in September: 33

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in September
South Duxbury, MA

Average visibility in September - South Duxbury, 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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South Duxbury, Massachusetts, USA

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