September weather forecast
Biddeford, ME

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Weather in September

September signals the arrival of the fall season in Biddeford and a marginally cooler climate with temperatures returning to an average daily high of 68°F (20°C). The transition is also marked by shorter daylight hours, a stark contrast from the summer months. Yet, ample sunshine remains, exuding a glowing ambiance that impresses upon the colorful fall foliage. As the city steps into October, the weather will see a noticeable dip in temperature and an increase in rainfall.

Temperature

September witnesses a gentle descent in average high-temperature, descending from August's moderately hot 74.1°F (23.4°C) to a pleasant 68°F (20°C). Biddeford, during the month of September, experiences an average low-temperature of 54.7°F (12.6°C).

Humidity

The average relative humidity in September in Biddeford is 79%.

Rainfall

September is the month with the least rainfall. Rain falls for 10.5 days and accumulates 1.34" (34mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In Biddeford, the average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:06 am and sunset at 7:16 pm. On the last day of September, sunrise is at 6:38 am and sunset at 6:24 pm EDT.

Sunshine

In September, the average sunshine is 8.3h.

UV index

In Biddeford, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. To guard against the harmful effects of the Sun, minimize exposure during midday. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

Frequently asked questions

What is the temperature in September?

During September, Biddeford experiences an average high-temperature of 68°F (20°C) and a low-temperature of 54.7°F (12.6°C).

What is the average humidity in September?

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

What is the driest month?

The month with the least rainfall is September, when the rain falls for 10.5 days and typically collects 1.34" (34mm) of precipitation.

How many days does it rain in September?

In Biddeford, during September, the rain falls for 10.5 days and regularly aggregates up to 1.34" (34mm) of precipitation.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

How many hours of daylight does Biddeford have in September?

The average day length in September is 12h and 29min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:06 am and sunset at 7:16 pm. On the last day of the month, sunrise is at 6:38 am and sunset at 6:24 pm EDT.

How many hours of sunshine does Biddeford have in September?

The average sunshine duration in September is 8.3h.

How high is the UV index in September?

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health risk from 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
Biddeford, ME

Average temperature in September - Biddeford, ME
  • Average high temperature in September: 68°F

The warmest month (with the highest average high temperature) is July (74.5°F).
The month with the lowest average high temperature is January (30.7°F).

  • Average low temperature in September: 54.7°F

The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

Average pressure in September
Biddeford, ME

Average pressure in September - Biddeford, 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
Biddeford, ME

Average wind speed in September - Biddeford, ME
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.7mph).

Average humidity in September
Biddeford, ME

Average humidity in September - Biddeford, 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 (75%).

Average rainfall in September
Biddeford, ME

Average rainfall in September - Biddeford, ME
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is October (2.95").
The driest month (with the least rainfall) is September (1.34").

Average rainfall days in September
Biddeford, ME

Average rainfall days in September - Biddeford, ME
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is April (14.3 days).
The month with the least rainy days is January (6.3 days).

Average snowfall in September
Biddeford, ME

Average snowfall in September - Biddeford, ME
  • Average snowfall in September: 0"

The month with the highest snowfall is February (4.41").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Biddeford, ME

Average snowfall days in September - Biddeford, ME
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Biddeford, 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 2min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).

Average sunshine days in September
Biddeford, ME

Average sunshine days in September - Biddeford, ME
  • Average sunshine days in September: 18.3 days

The month with the most sunshine days is September (18.3 days).
The month with the least sunshine days is April (12.9 days).

Average UV index in September
Biddeford, ME

Average UV index in September - Biddeford, ME
  • Average UV index in September: 4

The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in September
Biddeford, ME

Average cloud cover in September - Biddeford, ME
  • Average cloud cover in September: 34

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 32).

Average visibility in September
Biddeford, ME

Average visibility in September - Biddeford, 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).

Biddeford, Maine, USA

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