September weather forecast
Islesboro, ME

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Weather in September

September, the first month of the autumn in Islesboro, is still a comfortable month, with an average temperature varying between 67.1°F (19.5°C) and 51.1°F (10.6°C).

Temperature

September brings a slight decrease in the average high-temperature, shifting from a moderately hot 73.9°F (23.3°C) in August to a refreshing 67.1°F (19.5°C). Throughout the month of September, Islesboro sees a steady low-temperature average of 51.1°F (10.6°C).

Humidity

In Islesboro, the average relative humidity in September is 80%.

Rainfall

July and September are months with the least rain when the rain falls for 10.2 days and typically aggregates up to 1.46" (37mm) of rain.

Snowfall

In Islesboro, snow does not fall in June through September.

Daylight

In Islesboro, the average length of the day in September is 12h and 30min.
On the first day of September in Islesboro, Maine, sunrise is at 5:59 am and sunset at 7:11 pm. On the last day of the month, sunrise is at 6:33 am and sunset at 6:17 pm EDT.

Sunshine

In September, the average sunshine is 8.1h.

UV index

In September, the average daily maximum UV index in Islesboro, Maine, is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: In September, the maximum UV index of 4 suggests this advice:
Ensure safety - Sun damage prevention is strongly urged. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
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Frequently asked questions

What is the temperature in September in Islesboro?

An average high-temperature, in September, in Islesboro, is 67.1°F (19.5°C) and the average low-temperature is 51.1°F (10.6°C).

What is the average humidity in September in Islesboro?

The average relative humidity in September in Islesboro, Maine, is 80%.

What is the driest month in Islesboro?

July and September are months with the least rain when the rain falls for 10.2 days and typically aggregates up to 1.46" (37mm) of rain.

How much does it rain in Islesboro in September?

In Islesboro, in September, during 10.2 rainfall days, 1.46" (37mm) of precipitation is typically accumulated.

When it does not snow in Islesboro?

June through September are months without snowfall.

Does it snow in Islesboro in September?

In Islesboro, Maine, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Islesboro have in September?

In Islesboro, the average day length in September is 12h and 30min.

When is the sunrise / sunset in September in Islesboro?

In September, on the first day of the month, sunrise is at 5:59 am and sunset at 7:11 pm. On the last day of the month, sunrise is at 6:33 am and sunset at 6:17 pm EDT.

How long on average sun shines in September in Islesboro?

In September, the average sunshine duration in Islesboro is 8.1h.

What is the UV index reading in September in Islesboro?

The average daily maximum UV index in September in Islesboro, Maine, is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
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
Islesboro, ME

Average temperature in September - Islesboro, ME
  • Average high temperature in September: 67.1°F

The warmest months (with the highest average high temperature) are July and August (73.9°F).
The month with the lowest average high temperature is January (28.4°F).

  • Average low temperature in September: 51.1°F

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).

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Average pressure in September
Islesboro, ME

Average pressure in September - Islesboro, 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
Islesboro, ME

Average wind speed in September - Islesboro, ME
  • Average wind speed in September: 6.8mph

The windiest month (with the highest average wind speed) is March (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

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Average humidity in September
Islesboro, ME

Average humidity in September - Islesboro, ME
  • Average humidity in September: 80%

The months with the highest relative humidity are February and July (83%).
The month with the lowest relative humidity is November (77%).

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Average rainfall in September
Islesboro, ME

Average rainfall in September - Islesboro, ME
  • Average rainfall in September: 1.46"

The wettest month (with the highest rainfall) is December (2.72").
The driest months (with the least rainfall) are July and September (1.46").

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Average rainfall days in September
Islesboro, ME

Average rainfall days in September - Islesboro, ME
  • Average rainfall days in September: 10.2 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (7.1 days).

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Average snowfall in September
Islesboro, ME

Average snowfall in September - Islesboro, ME
  • Average snowfall in September: 0"

The month with the highest snowfall is January (4.57").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Islesboro, ME

Average snowfall days in September - Islesboro, ME
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Islesboro, ME

Average daylight in September / Average sunshine in September - Islesboro, ME
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

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Average sunshine days in September
Islesboro, ME

Average sunshine days in September - Islesboro, ME
  • Average sunshine days in September: 17.9 days

The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is April (11.7 days).

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Average UV index in September
Islesboro, ME

Average UV index in September - Islesboro, 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
Islesboro, ME

Average cloud cover in September - Islesboro, ME
  • Average cloud cover in September: 37

The month with the most cloud cover is March (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 37).

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Average visibility in September
Islesboro, ME

Average visibility in September - Islesboro, ME
  • Average visibility in September: 5mi

The months with the highest visibility are January, February, March, April, October, November and December (6mi).
The months with the lowest visibility are May, June, July, August and September (5mi).

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Islesboro, Maine, USA

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