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
In September, the average high-temperature registers at an enjoyable 67.1°F (19.5°C), nearly identical to August's 72.1°F (22.3°C). East Dennis reports an average low temperature of 63°F (17.2°C) in September, a minor decrease from the day's highs.Humidity
In September, the average relative humidity in East Dennis is 79%.Rainfall
In East Dennis, during September, the rain falls for 9.5 days and regularly aggregates up to 1.18" (30mm) of precipitation. Throughout the year, there are 129 rainfall days, and 14.21" (361mm) of precipitation is accumulated.Snowfall
In East Dennis, snow does not fall in May through November.Ocean temperature
In East Dennis, the average seawater temperature in September is 64.2°F (17.9°C).Note: In 64.2°F (17.9°C), swimming is not an enjoyable activity for most. As the temperature decreases from 69.8°F (21°C) to 59°F (15°C), it becomes harder to control breathing.
Daylight
In East Dennis, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:07 am and sunset at 7:13 pm. On the last day of September, in East Dennis, sunrise is at 6:37 am and sunset at 6:23 pm EDT.
Sunshine
In September, the average sunshine in East Dennis is 8.7h.UV index
In East Dennis, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. It's recommended to limit sun exposure when its radiation is at its peak during midday. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
What are the temperatures in East Dennis in September?
What is the average humidity in September in East Dennis?
How many days does it rain in September in East Dennis?
When it does not snow in East Dennis?
What is the ocean temperature in September in East Dennis?
What is the average length of the day in September in East Dennis?
What time are sunrise and sunset in September in East Dennis?
How many hours of sunshine does East Dennis have in September?
What is the UV index reading in September in East Dennis?
Average temperature in September
East Dennis, MA
- Average high temperature in September: 67.1°F
The warmest month (with the highest average high temperature) is August (72.1°F).
The month with the lowest average high temperature is January (38.5°F).
- Average low temperature in September: 63°F
The month with the highest average low temperature is August (68.5°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in September
East Dennis, 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
East Dennis, MA
- Average wind speed in September: 12.8mph
The windiest month (with the highest average wind speed) is January (16.8mph).
The calmest months (with the lowest average wind speed) are July and August (10.9mph).
Average humidity in September
East Dennis, MA
- Average humidity in September: 79%
The months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is November (74%).
Average rainfall in September
East Dennis, MA
- Average rainfall in September: 1.18"
The wettest month (with the highest rainfall) is October (1.93").
The driest month (with the least rainfall) is August (0.94").
Average rainfall days in September
East Dennis, MA
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is May (12.5 days).
The month with the least rainy days is February (8.3 days).
Average snowfall in September
East Dennis, MA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.87").
The months with the least snowfall are May, June, July, August, September, October and November (0").
Average snowfall days in September
East Dennis, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
East Dennis, 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).
Average daylight in September /
Average sunshine in September
East Dennis, 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 48min).
The months with the least sunshine are February and December (Average sunshine: 4h and 36min).
Average sunshine days in September
East Dennis, MA
- Average sunshine days in September: 18.6 days
The month with the most sunshine days is September (18.6 days).
The month with the least sunshine days is February (14.3 days).
Average UV index in September
East Dennis, 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
East Dennis, MA
- Average cloud cover in September: 31
The month with the most cloud cover is December (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
East Dennis, 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).
East Dennis, Massachusetts, USA
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