September weather forecast
Swans Island, ME

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Weather in September

The first month of the autumn, September, is still a comfortable month in Swans Island, Maine, with an average temperature varying between 52.7°F (11.5°C) and 67.1°F (19.5°C).

Temperature

The beginning of September subtly marks a decrease in the average high-temperature, transitioning from a moderately hot 73.4°F (23°C) in August to an enjoyable 67.1°F (19.5°C). In Swans Island, September nights witness a steady temperature drop to a cool 52.7°F (11.5°C).

Humidity

The average relative humidity in September is 79%.

Rainfall

In Swans Island, Maine, in September, during 10.5 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. Throughout the year, there are 142.1 rainfall days, and 32.28" (820mm) of precipitation is accumulated.

Snowfall

In Swans Island, snow does not fall in June through September.

Daylight

In September, the average length of the day is 12h and 30min.
On the first day of the month, sunrise is at 5:57 am and sunset at 7:09 pm. On the last day of September, sunrise is at 6:31 am and sunset at 6:15 pm EDT.

Sunshine

The average sunshine in September is 8.2h.

UV index

In Swans Island, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 4 during September translates into the following directions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

The high-temperature, in September, in Swans Island, records 67.1°F (19.5°C), while the low-temperature is 52.7°F (11.5°C).

What is the average humidity in September?

In Swans Island, the average relative humidity in September is 79%.

How much does it rain in September?

In Swans Island, in September, it is raining for 10.5 days, with typically 1.81" (46mm) of accumulated precipitation.

When it does not snow?

In Swans Island, snow does not fall in June through September.

Does it snow in September?

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

What is the average length of the day in September in Swans Island?

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

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 5:57 am and sunset at 7:09 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 6:15 pm EDT.

How long on average sun shines in September?

In Swans Island, the average sunshine duration in September is 8.2h.

What is the UV index reading in September?

In Swans Island, Maine, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from unsafe 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
Swans Island, ME

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

The warmest month (with the highest average high temperature) is August (73.4°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in September: 52.7°F

The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).

Average pressure in September
Swans Island, ME

Average pressure in September - Swans Island, 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).

Average wind speed in September
Swans Island, ME

Average wind speed in September - Swans Island, ME
  • Average wind speed in September: 7.1mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).

Average humidity in September
Swans Island, ME

Average humidity in September - Swans Island, ME
  • Average humidity in September: 79%

The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is November (76%).

Average rainfall in September
Swans Island, ME

Average rainfall in September - Swans Island, ME
  • Average rainfall in September: 1.81"

The wettest month (with the highest rainfall) is December (3.94").
The driest month (with the least rainfall) is July (1.57").

Average rainfall days in September
Swans Island, ME

Average rainfall days in September - Swans Island, ME
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is April (15.5 days).
The month with the least rainy days is February (7.5 days).

Average snowfall in September
Swans Island, ME

Average snowfall in September - Swans Island, ME
  • Average snowfall in September: 0"

The month with the highest snowfall is February (5.75").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Swans Island, ME

Average snowfall days in September - Swans Island, ME
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Swans Island, ME

Average daylight in September / Average sunshine in September - Swans Island, 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 1min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).

Average sunshine days in September
Swans Island, ME

Average sunshine days in September - Swans Island, ME
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is August (18.7 days).
The month with the least sunshine days is April (11.2 days).

Average UV index in September
Swans Island, ME

Average UV index in September - Swans Island, 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).

Average cloud cover in September
Swans Island, ME

Average cloud cover in September - Swans Island, ME
  • Average cloud cover in September: 35

The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 35).

Average visibility in September
Swans Island, ME

Average visibility in September - Swans Island, ME
  • Average visibility in September: 6mi

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

Swans Island, Maine, USA

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