September weather forecast and climate
Stonington, ME

Weather in September

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

Temperature

In Stonington, the average high-temperature in September is essentially the same as in August - an enjoyable 63.9°F (17.7°C). The average low-temperature,, is 54.7°F (12.6°C).

Humidity

The average relative humidity in September is 82%.

Rainfall

September is the month with the least rainfall in Stonington, Maine. Rain falls for 8.7 days and accumulates 0.91" (23mm) of precipitation.

Snowfall

In Stonington snow does not fall in May through September.

Ocean temperature

In Stonington, the average seawater temperature is 56.8°F (13.8°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

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

Sunshine

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

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sun damage is advised. 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 Stonington?

The average relative humidity in September is 82%.

What is the driest month in Stonington?

The month with the least rainfall in Stonington 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 Stonington?

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

When it does not snow in Stonington?

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

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 September, the average ocean temperature in Stonington is 56.8°F (13.8°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

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

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

How long on average sun shines in September in Stonington?

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

How high is the UV index in September in Stonington?

In Stonington, Maine, the average daily maximum UV index in September is 4. 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
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"

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

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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").
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).
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: 12.5h

The month with the longest days is June (Average daylight: 15.5h).
The month with the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in September: 8.5h

The month with the most sunshine is August (Average sunshine: 10.4h).
The month with the least sunshine is December (Average sunshine: 4.5h).

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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

Months with the highest UV index are June, July and August (UV index 5).
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

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

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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