September weather forecast
Belfast, ME

Weather in September

September, the first month of the autumn in Belfast, is also an enjoyable month, with an average temperature varying between 67.1°F (19.5°C) and 51.1°F (10.6°C).

Temperature

In Belfast, Maine, the average high-temperature in September marginally drops from a moderately hot 73.9°F (23.3°C) in August to a comfortable 67.1°F (19.5°C). In Belfast, the average low-temperature is 51.1°F (10.6°C).

Humidity

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

Rainfall

The months with the least rainfall in Belfast are July and September Rain falls for 10.2 days and accumulates 1.46" (37mm) of rain.

Snowfall

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

Ocean temperature

In September, the average ocean temperature is 58.3°F (14.6°C).
Note: Swimming in 58.3°F (14.6°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In September, the average length of the day is 12h and 30min.
On the first day of September in Belfast, Maine, sunrise is at 5:59 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:32 am and sunset at 6:19 pm EDT.

Sunshine

In Belfast, the average sunshine in September is 8.1h.

UV index

The average daily maximum UV index in September in Belfast is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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 the 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 Belfast?

In September, the average relative humidity is 80%.

What is the driest month in Belfast?

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

How much does it rain in Belfast in September?

In Belfast, Maine, during September, the rain falls for 10.2 days and regularly aggregates up to 1.46" (37mm) of precipitation.

When it does not snow in Belfast?

In Belfast, Maine, snow does not fall in June through September.

Does it snow in Belfast in September?

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

How cold is the water in September in Belfast?

In September, the average ocean temperature in Belfast, Maine, is 58.3°F (14.6°C). Swimming in 58.3°F (14.6°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

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

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

When are sunrise and sunset in September in Belfast?

In September, on the first day of the month, sunrise is at 5:59 am and sunset at 7:12 pm. On the last day of the month, in Belfast, Maine, sunrise is at 6:32 am and sunset at 6:19 pm EDT.

How long on average sun shines in September in Belfast?

The average sunshine duration in September in Belfast, Maine, is 8.1h.

How high is the UV index in September in Belfast?

The average daily maximum UV index in September in Belfast, Maine, is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Belfast, ME

Average temperature in September - Belfast, 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
Belfast, ME

Average pressure in September - Belfast, 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
Belfast, ME

Average wind speed in September - Belfast, 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
Belfast, ME

Average humidity in September - Belfast, 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
Belfast, ME

Average rainfall in September - Belfast, 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
Belfast, ME

Average rainfall days in September - Belfast, 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
Belfast, ME

Average snowfall in September - Belfast, 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
Belfast, ME

Average snowfall days in September - Belfast, 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 sea temperature in September
Belfast, ME

Average sea temperature in September - Belfast, ME
  • Average sea temperature in September: 58.3°F

The best month for swimming (with the highest average sea temperature) is August (60.4°F).
The coldest month (with the lowest average sea temperature) is March (37.8°F).

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

Average daylight in September / Average sunshine in September - Belfast, ME
  • Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 29min).
The month with the shortest days is December (Average daylight: 8h and 55min).

  • Average sunshine in September: 8h and 6min

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
Belfast, ME

Average sunshine days in September - Belfast, 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
Belfast, ME

Average UV index in September - Belfast, 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
Belfast, ME

Average cloud cover in September - Belfast, 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
Belfast, ME

Average visibility in September - Belfast, 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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