September weather forecast
Cliff Island, ME

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Weather in September

The first month of the autumn, September, is still a refreshing month in Cliff Island, Maine, with an average temperature fluctuating between 66.6°F (19.2°C) and 55°F (12.8°C).

Temperature

The start of September comes with a small reduction in the average high-temperature, subtly receding from a pleasant 72.3°F (22.4°C) in August to an enjoyable 66.6°F (19.2°C). September generally records an average low-temperature of 55°F (12.8°C).

Humidity

The average relative humidity in September is 79%.

Rainfall

The month with the least rainfall is September, when the rain falls for 9 days and typically collects 0.94" (24mm) of precipitation.

Snowfall

In Cliff Island, snow does not fall in May through September.

Daylight

In September, the average length of the day is 12h and 29min.
On the first day of the month, sunrise is at 6:04 am and sunset at 7:15 pm. On the last day of September, sunrise is at 6:37 am and sunset at 6:22 pm EDT.

Sunshine

The average sunshine in September is 8.7h.

UV index

In Cliff Island, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In September, a regular UV index of 4 translates into these guidelines:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.

Frequently asked questions

What are September temperatures?

In Cliff Island, in September, the average high-temperature is 66.6°F (19.2°C), and the average low-temperature is 55°F (12.8°C).

What is the average humidity in September?

The average relative humidity in September is 79%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 9 days and accumulates 0.94" (24mm) of precipitation.

How many days does it rain in September?

In Cliff Island, during September, the rain falls for 9 days and regularly aggregates up to 0.94" (24mm) of precipitation.

When it does not snow?

In Cliff Island, snow does not fall in May through September.

Does it snow in September?

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

What is the average length of the day in September?

In September, the average day length is 12h and 29min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:04 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 6:22 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.7h.

What is the UV index reading in September in Cliff Island?

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to 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
Cliff Island, ME

Average temperature in September - Cliff Island, ME
  • Average high temperature in September: 66.6°F

The warmest month (with the highest average high temperature) is August (72.3°F).
The month with the lowest average high temperature is January (30.2°F).

  • Average low temperature in September: 55°F

The months with the highest average low temperature are July and August (61.3°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).

Average pressure in September
Cliff Island, ME

Average pressure in September - Cliff Island, ME
  • Average pressure in September: 30.05"Hg

The months with the highest atmospheric pressure are September and November (30.05"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in September
Cliff Island, ME

Average wind speed in September - Cliff Island, ME
  • Average wind speed in September: 8.3mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.3mph).

Average humidity in September
Cliff Island, ME

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

The months with the highest relative humidity are June and July (82%).
The month with the lowest relative humidity is November (74%).

Average rainfall in September
Cliff Island, ME

Average rainfall in September - Cliff Island, ME
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is October (2.28").
The driest month (with the least rainfall) is September (0.94").

Average rainfall days in September
Cliff Island, ME

Average rainfall days in September - Cliff Island, ME
  • Average rainfall days in September: 9 days

The month with the highest number of rainy days is July (14.5 days).
The month with the least rainy days is January (4.4 days).

Average snowfall in September
Cliff Island, ME

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

The month with the highest snowfall is February (3.39").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Cliff Island, ME

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

The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Cliff 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: 9h and 0min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).

Average sunshine days in September
Cliff Island, ME

Average sunshine days in September - Cliff Island, ME
  • Average sunshine days in September: 19 days

The month with the most sunshine days is September (19 days).
The month with the least sunshine days is July (14.7 days).

Average UV index in September
Cliff Island, ME

Average UV index in September - Cliff 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
Cliff Island, ME

Average cloud cover in September - Cliff Island, ME
  • Average cloud cover in September: 31

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in September
Cliff Island, ME

Average visibility in September - Cliff Island, 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).

Cliff Island, Maine, USA

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