September weather forecast and climate
Oak Bluffs, MA

Weather in September

September, the first month of the autumn, in Oak Bluffs, is also an agreeable month, with average temperature fluctuating between 68.2°F (20.1°C) and 63.5°F (17.5°C).

Temperature

In Oak Bluffs, the average high-temperature in September marginally drops, from a warm 73.8°F (23.2°C) in August, to an agreeable 68.2°F (20.1°C). In September, in Oak Bluffs, the average low-temperature is 63.5°F (17.5°C).

Humidity

The average relative humidity in Oak Bluffs is 78%.

Rainfall

In Oak Bluffs, in September, during 5.9 rainfall days, 0.47" (12mm) of precipitation is typically accumulated. Throughout the year, there are 89.3 rainfall days, and 6.14" (156mm) of precipitation is accumulated.

Snowfall

April through November are months without snowfall in Oak Bluffs, Massachusetts.

Ocean temperature

In Oak Bluffs, Massachusetts, in September, the average water temperature is 66.4°F (19.1°C).
Note: For swimming, a surface water temperature of 66.4°F (19.1°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).

Daylight

In Oak Bluffs, Massachusetts, the average length of the day in September is 12.5h.

Sunshine

The average sunshine in September is 8.6h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Oak Bluffs?

In Oak Bluffs, the average relative humidity in September is 78%.

How much does it rain in Oak Bluffs in September?

In Oak Bluffs, Massachusetts, during September, the rain falls for 5.9 days and regularly aggregates up to 0.47" (12mm) of precipitation.

When it does not snow in Oak Bluffs?

In Oak Bluffs snow does not fall in April through November.

What is the ocean temperature in September in Oak Bluffs?

In Oak Bluffs, Massachusetts, the average seawater temperature in September is 66.4°F (19.1°C). For swimming, a surface water temperature of 66.4°F (19.1°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 Oak Bluffs?

The average length of the day in September is 12.5h.

How long on average sun shines in September in Oak Bluffs?

In Oak Bluffs, Massachusetts, the average sunshine in September is 8.6h.

How high is the UV index in September in Oak Bluffs?

In Oak Bluffs, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.

Average temperature in September
Oak Bluffs, MA

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

The warmest month (with the highest average high temperature) is August (73.8°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in September: 63.5°F

The month with the highest average low temperature is August (68.9°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).

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Average pressure in September
Oak Bluffs, MA

Average pressure in September - Oak Bluffs, 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 (29.93").

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Average wind speed in September
Oak Bluffs, MA

Average wind speed in September - Oak Bluffs, MA
  • Average wind speed in September: 12.4mph

The windiest month (with the highest average wind speed) is January (16mph).
The calmest month (with the lowest average wind speed) is July (10.7mph).

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Average humidity in September
Oak Bluffs, MA

Average humidity in September - Oak Bluffs, MA
  • Average humidity in September: 78%

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
Oak Bluffs, MA

Average rainfall in September - Oak Bluffs, MA
  • Average rainfall in September: 0.47"

The wettest month (with the highest rainfall) is October (0.83").
The driest month (with the least rainfall) is July (0.35").

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Average rainfall days in September
Oak Bluffs, MA

Average rainfall days in September - Oak Bluffs, MA
  • Average rainfall days in September: 5.9 days

The month with the highest number of rainy days is July (9.1 days).
Months with the least rainy days are September and November (5.9 days).

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Average snowfall in September
Oak Bluffs, MA

Average snowfall in September - Oak Bluffs, MA
  • Average snowfall in September: 0"

Months with the highest snowfall are January and February (0.24").
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
Oak Bluffs, MA

Average snowfall days in September - Oak Bluffs, MA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.6 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
Oak Bluffs, MA

Average sea temperature in September - Oak Bluffs, 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
Oak Bluffs, MA

Average daylight in September / Average sunshine in September - Oak Bluffs, 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: 8.6h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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Average sunshine days in September
Oak Bluffs, MA

Average sunshine days in September - Oak Bluffs, MA
  • Average sunshine days in September: 21.4 days

The month with the most sunshine days is September (21.4 days).
The month with the least sunshine days is February (18.5 days).

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Average UV index in September
Oak Bluffs, MA

Average UV index in September - Oak Bluffs, 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
Oak Bluffs, MA

Average cloud cover in September - Oak Bluffs, 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 28).

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Average visibility in September
Oak Bluffs, MA

Average visibility in September - Oak Bluffs, 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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