September weather forecast
Stonington, ME

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Weather in September

September, the first month of the autumn in Stonington, is also an enjoyable month, with temperature in the range of an average high of 63.9°F (17.7°C) and an average low of 54.7°F (12.6°C).

Temperature

The arrival of September marks a slight shift to an average high-temperature of an enjoyable 63.9°F (17.7°C) from August's 68.9°F (20.5°C). Throughout September, Stonington encounters an average temperature drop to a fresh 54.7°F (12.6°C).

Humidity

In Stonington, the average relative humidity in September is 82%.

Rainfall

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

Snowfall

In Stonington, snow does not fall in May through September.

Ocean temperature

In Stonington, in September, the average water temperature is 56.8°F (13.8°C).
Note: Diving into 56.8°F (13.8°C) is practical below 50°F (10°C), given you're wearing protective swim gear; without it, expect a quick onset of cold shock and a struggle to breathe. Merely touching waters at 55.4°F (13°C) feels ice-cold.

Daylight

The average length of the day in September is 12h and 30min.
On the first day of the month, sunrise is at 5:58 am and sunset at 7:10 pm. On the last day of September, in Stonington, sunrise is at 6:32 am and sunset at 6:16 pm EDT.

Sunshine

In September, the average sunshine is 8.5h.

UV index

The average daily maximum UV index in September in Stonington is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index of 4 during September translates into these guidelines:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
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Frequently asked questions

What is the usual temperature for Stonington in September?

September temperatures in Stonington vary between a high-temperature of 63.9°F (17.7°C) and a low-temperature of 54.7°F (12.6°C).

What is the average humidity in September in Stonington?

The average relative humidity in September in Stonington is 82%.

What is the driest month in Stonington?

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

How much does it rain in Stonington in September?

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

When it does not snow in Stonington?

May through September are months without snowfall in Stonington.

Does it snow in Stonington in September?

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

What is the ocean temperature in September in Stonington?

In Stonington, Maine, the average seawater temperature in September is 56.8°F (13.8°C). 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.

How many hours of daylight does Stonington have in September?

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

When are sunrise and sunset in September in Stonington?

In September, on the first day of the month, sunrise is at 5:58 am and sunset at 7:10 pm. On the last day of the month, in Stonington, Maine, sunrise is at 6:32 am and sunset at 6:16 pm EDT.

How many hours of sunshine does Stonington have in September?

In Stonington, the average sunshine duration in September is 8.5h.

How high is the UV index in September in Stonington?

In Stonington, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's 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
Stonington, ME

Average temperature in September - Stonington, 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
Stonington, ME

Average pressure in September - Stonington, 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
Stonington, ME

Average wind speed in September - Stonington, 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
Stonington, ME

Average humidity in September - Stonington, 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
Stonington, ME

Average rainfall in September - Stonington, 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
Stonington, ME

Average rainfall days in September - Stonington, 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
Stonington, ME

Average snowfall in September - Stonington, 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
Stonington, ME

Average snowfall days in September - Stonington, 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
Stonington, ME

Average sea temperature in September - Stonington, 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
Stonington, ME

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

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in September: 8h and 3min

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
Stonington, ME

Average sunshine days in September - Stonington, 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
Stonington, ME

Average UV index in September - Stonington, 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
Stonington, ME

Average cloud cover in September - Stonington, 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
Stonington, ME

Average visibility in September - Stonington, 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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Stonington, Maine, USA

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