September weather forecastSouth Duxbury, MA
September
Weather in September
September, the first month of the autumn in South Duxbury, is still a pleasant month, with an average temperature ranging between max 69.3°F (20.7°C) and min 59.9°F (15.5°C).Temperature
South Duxbury's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's warm 75.7°F (24.3°C) to an agreeable 69.3°F (20.7°C). Throughout the month of September, the average temperature dips to a mild 59.9°F (15.5°C) at night.Humidity
In September, the average relative humidity is 78%.Rainfall
In South Duxbury, in September, during 10.1 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. In South Duxbury, during the entire year, the rain falls for 120.2 days and collects up to 12.24" (311mm) of precipitation.Snowfall
In South Duxbury, snow does not fall in May through October.Ocean temperature
In South Duxbury, the average seawater temperature in September is 64°F (17.8°C).Note: Swimming in water at 64°F (17.8°C) is not a pleasurable experience for most. The task of managing breathing becomes more challenging as the water temperature descends from 69.8°F (21°C) to 59°F (15°C).
Daylight
In South Duxbury, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:09 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 6:25 pm EDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 4 during September leads to these instructions:
Exercise care. People with light skin might get burns in fewer than 30 minutes. To guard against the harmful effects of the Sun, minimize exposure during midday. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
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).
Average daylight in September /
Average sunshine in September
South Duxbury, MA
- Average daylight in September: 12h and 30min
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 36min
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).
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).
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).
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).
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).
