September weather forecast
Deer Isle, ME

Weather in September

September, the first month of the autumn in Deer Isle, is also an enjoyable month, with an average temperature varying between 63.9°F (17.7°C) and 54.7°F (12.6°C).

Temperature

In September, the average high-temperature is almost the same as in August - a comfortable 63.9°F (17.7°C). In Deer Isle, Maine, the average low-temperature is 54.7°F (12.6°C).

Humidity

In Deer Isle, Maine, the average relative humidity in September is 82%.

Rainfall

The month with the least rainfall in Deer Isle is September, when the rain falls for 8.7 days and typically collects 0.91" (23mm) of precipitation.

Snowfall

May through September are months without snowfall in Deer Isle, Maine.

Ocean temperature

In Deer Isle, Maine, the average water temperature is 56.8°F (13.8°C).
Note: Swimming in 56.8°F (13.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In Deer Isle, the average length of the day in September is 12h and 30min.
On the first day of the month, sunrise is at 5:57 am and sunset at 7:11 pm. On the last day of September, in Deer Isle, sunrise is at 6:31 am and sunset at 6:17 pm EDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

In Deer Isle, Maine, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the 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 temperature in September in Deer Isle?

The average high-temperature, in September, in Deer Isle, Maine, is 63.9°F (17.7°C), while the average low-temperature is 54.7°F (12.6°C).

What is the average humidity in September in Deer Isle?

In September, the average relative humidity in Deer Isle, Maine, is 82%.

What is the driest month in Deer Isle?

The month with the least rainfall in Deer Isle is September, when the rain falls for 8.7 days and typically collects 0.91" (23mm) of precipitation.

How many days does it rain in September in Deer Isle?

In September, in Deer Isle, Maine, the rain falls for 8.7 days. Throughout September, 0.91" (23mm) of precipitation is accumulated.

When it does not snow in Deer Isle?

In Deer Isle, Maine, snow does not fall in May through September.

Does it snow in Deer Isle in September?

In Deer Isle, in September, it doesn't snow. In October, it regularly snows.

What is the water temperature in September in Deer Isle?

In September, the average ocean temperature is 56.8°F (13.8°C). Swimming in 56.8°F (13.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Deer Isle have in September?

The average day length in September is 12h and 30min.

When is the sunrise / sunset in September in Deer Isle?

In September, on the first day of the month, sunrise is at 5:57 am and sunset at 7:11 pm. On the last day of the month, in Deer Isle, sunrise is at 6:31 am and sunset at 6:17 pm EDT.

How long on average sun shines in September in Deer Isle?

The average sunshine duration in September is 8.5h.

What is the UV index intensity in September in Deer Isle?

The average daily maximum UV index in September in Deer Isle is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Deer Isle, ME

Average temperature in September - Deer Isle, ME
  • Average high temperature in September: 63.9°F

The warmest month (with the highest average high temperature) is August (68.9°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in September: 54.7°F

The month with the highest average low temperature is August (59.9°F).
The coldest month (with the lowest average low temperature) is January (21°F).

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Average pressure in September
Deer Isle, ME

Average pressure in September - Deer Isle, ME
  • Average pressure in September: 30.04"Hg

The month with the highest atmospheric pressure is September (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Deer Isle, ME

Average wind speed in September - Deer Isle, ME
  • Average wind speed in September: 9.2mph

The windiest month (with the highest average wind speed) is January (14.4mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).

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Average humidity in September
Deer Isle, ME

Average humidity in September - Deer Isle, ME
  • Average humidity in September: 82%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is November (76%).

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Average rainfall in September
Deer Isle, ME

Average rainfall in September - Deer Isle, ME
  • Average rainfall in September: 0.91"

The wettest month (with the highest rainfall) is October (2.09").
The driest month (with the least rainfall) is September (0.91").

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Average rainfall days in September
Deer Isle, ME

Average rainfall days in September - Deer Isle, ME
  • Average rainfall days in September: 8.7 days

The month with the highest number of rainy days is July (12.8 days).
The month with the least rainy days is February (5.3 days).

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Average snowfall in September
Deer Isle, ME

Average snowfall in September - Deer Isle, ME
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.32").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Deer Isle, ME

Average snowfall days in September - Deer Isle, ME
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in September
Deer Isle, ME

Average sea temperature in September - Deer Isle, ME
  • Average sea temperature in September: 56.8°F

The best month for swimming (with the highest average sea temperature) is August (58.6°F).
The coldest month (with the lowest average sea temperature) is March (38.2°F).

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Average daylight in September /
Average sunshine in September
Deer Isle, ME

Average daylight in September / Average sunshine in September - Deer Isle, ME
  • Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 28min).
The month with the shortest days is December (Average daylight: 8h and 56min).

  • Average sunshine in September: 8h and 30min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 4h and 30min).

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Average sunshine days in September
Deer Isle, ME

Average sunshine days in September - Deer Isle, ME
  • Average sunshine days in September: 19.9 days

The month with the most sunshine days is September (19.9 days).
The month with the least sunshine days is July (15.4 days).

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Average UV index in September
Deer Isle, ME

Average UV index in September - Deer Isle, ME
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 5).
The 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
Deer Isle, ME

Average cloud cover in September - Deer Isle, ME
  • Average cloud cover in September: 32

The months with the most cloud cover are February and March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in September
Deer Isle, ME

Average visibility in September - Deer Isle, ME
  • 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).

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