Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Plymouth's progression into September involves a gentle drop in the average high-temperature, from a moderately hot 76.6°F (24.8°C) in August to a pleasant 70.2°F (21.2°C). Plymouth's average low-temperature in the month of September is recorded at a refreshing 59.7°F (15.4°C).Humidity
In Plymouth, the average relative humidity in September is 78%.Rainfall
In Plymouth, in September, it is raining for 11 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, in Plymouth, there are 132.2 rainfall days, and 16.3" (414mm) of precipitation is accumulated.Snowfall
In Plymouth, Massachusetts, snow does not fall in May through October.Ocean temperature
In Plymouth, in September, the average water temperature is 65.8°F (18.8°C).Note: Swimming is not an enjoyable activity for the majority when the water is at 65.8°F (18.8°C). The difficulty of controlling breathing increases as the temperature dips from 69.8°F (21°C) to 59°F (15°C).
Daylight
In September, the average length of the day 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 Plymouth, the average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September in Plymouth, Massachusetts, is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: A maximum high UV index of 4 in September translates into the following recommendations:
Undertake protective steps - Recommendations to avoid sunburn are issued. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Frequently asked questions
What are the temperatures in Plymouth in September?
What is the average humidity in September in Plymouth?
How many days does it rain in September in Plymouth?
When it does not snow in Plymouth?
What is the ocean temperature in September in Plymouth?
What is the average length of the day in September in Plymouth?
What time are sunrise and sunset in September in Plymouth?
How long on average sun shines in September in Plymouth?
What is the UV index reading in September in Plymouth?
Average temperature in September
Plymouth, MA
- Average high temperature in September: 70.2°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (35.8°F).
- Average low temperature in September: 59.7°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in September
Plymouth, 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
Plymouth, MA
- Average wind speed in September: 9.1mph
The windiest month (with the highest average wind speed) is January (12.3mph).
The calmest month (with the lowest average wind speed) is August (7.8mph).
Average humidity in September
Plymouth, MA
- Average humidity in September: 78%
The month with the highest relative humidity is July (80%).
The months with the lowest relative humidity are March, April and November (74%).
Average rainfall in September
Plymouth, MA
- Average rainfall in September: 1.1"
The wettest months (with the highest rainfall) are July and October (1.65").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days in September
Plymouth, MA
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is January (7.4 days).
Average snowfall in September
Plymouth, MA
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Plymouth, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Plymouth, MA
- Average sea temperature in September: 65.8°F
The best month for swimming (with the highest average sea temperature) is August (68.4°F).
The coldest month (with the lowest average sea temperature) is February (38.2°F).
Average daylight in September /
Average sunshine in September
Plymouth, 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 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).
Average sunshine days in September
Plymouth, MA
- Average sunshine days in September: 17 days
The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is July (14.8 days).
Average UV index in September
Plymouth, MA
- Average UV index in September: 4
The months with the highest UV index are June, 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
Plymouth, 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
Plymouth, 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).
Plymouth, Massachusetts, USA
Weather forecast for your location
2. Allow the app to use your location
