September weather forecast
West Dennis, MA

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Weather in September

September, the first month of the autumn in West Dennis, is also an enjoyable month, with an average temperature ranging between max 67.1°F (19.5°C) and min 63°F (17.2°C).

Temperature

As September takes hold, the average high-temperature is an enjoyable 67.1°F (19.5°C), nearly mirroring that of the previous month. September nighttime temperatures hover close to the daytime peak with an average of 63°F (17.2°C).

Humidity

The average relative humidity in September is 79%.

Rainfall

In West Dennis, during September, the rain falls for 9.5 days and regularly aggregates up to 1.18" (30mm) of precipitation. In West Dennis, Massachusetts, during the entire year, the rain falls for 129 days and collects up to 14.21" (361mm) of precipitation.

Snowfall

May through November are months without snowfall.

Ocean temperature

In West Dennis, in September, the average water temperature is 64.2°F (17.9°C).
Note: For the majority, swimming in 64.2°F (17.9°C) does not offer a pleasant experience. Below 69.8°F (21°C), the difficulty in controlling breathing escalates.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of September, sunrise is at 6:07 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 6:23 pm EDT.

Sunshine

In West Dennis, the average sunshine in September is 8.7h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: A typical high UV index of 4 in September suggests the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.

Frequently asked questions

What is the temperature in September?

In West Dennis, in September, the average high-temperature is 67.1°F (19.5°C), and the average low-temperature is 63°F (17.2°C).

What is the average humidity in September?

The average relative humidity in September is 79%.

How many days does it rain in September in West Dennis?

In September, the rain falls for 9.5 days. Throughout September, 1.18" (30mm) of precipitation is accumulated.

When it does not snow?

May through November are months without snowfall.

What is the ocean temperature in September?

In September, the average ocean temperature is 64.2°F (17.9°C). For swimming, a surface water temperature of 64.2°F (17.9°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 September, the average day length is 12h and 28min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:07 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 6:23 pm EDT.

How many hours of sunshine does West Dennis have in September?

In September, the average sunshine duration is 8.7h.

What is the UV index reading in September?

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability 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
West Dennis, MA

Average temperature in September - West 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
West Dennis, MA

Average pressure in September - West 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
West Dennis, MA

Average wind speed in September - West 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
West Dennis, MA

Average humidity in September - West 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
West Dennis, MA

Average rainfall in September - West 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
West Dennis, MA

Average rainfall days in September - West 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
West Dennis, MA

Average snowfall in September - West 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
West Dennis, MA

Average snowfall days in September - West 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
West Dennis, MA

Average sea temperature in September - West 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
West Dennis, MA

Average daylight in September / Average sunshine in September - West 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
West Dennis, MA

Average sunshine days in September - West 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
West Dennis, MA

Average UV index in September - West 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
West Dennis, MA

Average cloud cover in September - West 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
West Dennis, MA

Average visibility in September - West 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).

West Dennis, Massachusetts, USA

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