September weather forecast
Edgartown, MA

Classy and luxurious houses right on the harbor in Edgartown, Massachusetts, with long piers onto the water
Classy and luxurious houses right on the harbor in Edgartown, Massachusetts, with long piers onto the water

Weather in September

September, the first month of the autumn, in Edgartown, is also an agreeable month, with average temperature fluctuating between 68.2°F (20.1°C) and 63.7°F (17.6°C).

Temperature

In Edgartown, the average high-temperature slightly decreases, from a moderately hot 73.9°F (23.3°C) in August, to an agreeable 68.2°F (20.1°C). In September, the average low-temperature is 63.7°F (17.6°C).

Humidity

The average relative humidity in September is 79%.

Rainfall

In September, the rain falls for 11.4 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. In Edgartown, during the entire year, the rain falls for 146.4 days and collects up to 25.47" (647mm) of precipitation.

Snowfall

April through November are months without snowfall in Edgartown, Massachusetts.

Ocean temperature

In Edgartown, in September, the average water temperature is 66.4°F (19.1°C).
Note: Swimming in 66.4°F (19.1°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

In Edgartown, Massachusetts, the average length of the day is 12.5h.

Sunshine

In September, the average sunshine is 8.7h.

UV index

The average daily maximum UV index in Edgartown, Massachusetts, is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Edgartown?

In September, the average relative humidity in Edgartown is 79%.

How many days does it rain in September in Edgartown?

In Edgartown, during September, the rain falls for 11.4 days and regularly aggregates up to 1.85" (47mm) of precipitation.

When it does not snow in Edgartown?

April through November are months without snowfall.

What is the ocean temperature in September in Edgartown?

In Edgartown, the average seawater temperature in September is 66.4°F (19.1°C). For most, swimming in 66.4°F (19.1°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the average length of the day in September in Edgartown?

In Edgartown, the average length of the day in September is 12.5h.

How long on average sun shines in September in Edgartown?

The average sunshine in September in Edgartown, Massachusetts, is 8.7h.

What is the UV index reading in September in Edgartown?

In Edgartown, Massachusetts, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Edgartown, MA

Average temperature in September - Edgartown, MA
  • Average high temperature in September: 68.2°F

The warmest month (with the highest average high temperature) is August (73.9°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in September: 63.7°F

The month with the highest average low temperature is August (69.4°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).

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Average pressure in September
Edgartown, MA

Average pressure in September - Edgartown, MA
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is November (30.06").
The month with the lowest atmospheric pressure is June (29.94").

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Average wind speed in September
Edgartown, MA

Average wind speed in September - Edgartown, MA
  • Average wind speed in September: 12.6mph

The windiest month (with the highest average wind speed) is January (16.2mph).
The calmest months (with the lowest average wind speed) are July and August (10.9mph).

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Average humidity in September
Edgartown, MA

Average humidity in September - Edgartown, MA
  • Average humidity in September: 79%

Months with the highest relative humidity are May, June and July (83%).
The month with the lowest relative humidity is November (74%).

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Average rainfall in September
Edgartown, MA

Average rainfall in September - Edgartown, MA
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is October (3.07").
The driest months (with the least rainfall) are August and November (1.73").

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Average rainfall days in September
Edgartown, MA

Average rainfall days in September - Edgartown, MA
  • Average rainfall days in September: 11.4 days

The month with the highest number of rainy days is April (14.5 days).
The month with the least rainy days is February (8.6 days).

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Average snowfall in September
Edgartown, MA

Average snowfall in September - Edgartown, MA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (1.18").
Months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Edgartown, MA

Average snowfall days in September - Edgartown, MA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.3 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in September
Edgartown, MA

Average sea temperature in September - Edgartown, MA
  • Average sea temperature in September: 66.4°F

The best month for swimming (with the highest average sea temperature) is August (68.5°F).
The coldest month (with the lowest average sea temperature) is February (37.9°F).

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Average daylight in September /
Average sunshine in September
Edgartown, MA

Average daylight in September / Average sunshine in September - Edgartown, MA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 8.7h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is February (Average sunshine: 4.7h).

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Average sunshine days in September
Edgartown, MA

Average sunshine days in September - Edgartown, MA
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is November (16.7 days).
The month with the least sunshine days is April (13.5 days).

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Average UV index in September
Edgartown, MA

Average UV index in September - Edgartown, MA
  • Average UV index in September: 5

Months with the highest UV index are July and August (UV index 6).
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
Edgartown, MA

Average cloud cover in September - Edgartown, MA
  • Average cloud cover in September: 32

The month with the most cloud cover is December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in September
Edgartown, MA

Average visibility in September - Edgartown, MA
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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