September weather forecast
Coopersburg, PA

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Weather in September

The first month of the autumn, September, is still a warm month in Coopersburg, Pennsylvania, with an average temperature ranging between min 56.5°F (13.6°C) and max 75.6°F (24.2°C).

Temperature

The advent of September brings a subtle shift in temperature, with the average high moving from 82.4°F (28°C) in August to a still moderately hot 75.6°F (24.2°C). An average low-temperature of 56.5°F (13.6°C) is noted in Coopersburg during the month of September.

Humidity

The average relative humidity in September is 78%.

Rainfall

September is the month with the least rainfall. Rain falls for 12 days and accumulates 1.89" (48mm) of precipitation.

Snowfall

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

Daylight

In September, the average length of the day in Coopersburg is 12h and 27min.
On the first day of the month, sunrise is at 6:29 am and sunset at 7:33 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:44 pm EDT.

Sunshine

In September, the average sunshine is 8.7h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: During September, 4 as the daily maximum UV index converts into the following advice:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.

Frequently asked questions

What is the usual temperature for Coopersburg in September?

The average high-temperature and low-temperature during September are 75.6°F (24.2°C) and 56.5°F (13.6°C) respectively. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in August is computed to be 89.6°F (32°C).

What is the average humidity in September?

The average relative humidity in September is 78%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 12 days and typically collects 1.89" (48mm) of precipitation.

How much does it rain in September?

In September, the rain falls for 12 days. Throughout September, 1.89" (48mm) of precipitation is accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

How many hours of daylight does Coopersburg have in September?

The average day length in September is 12h and 27min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:29 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.7h.

What is the UV index reading in September?

The average daily maximum UV index in September in Coopersburg is 4. A UV Index value 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
Coopersburg, PA

Average temperature in September - Coopersburg, PA
  • Average high temperature in September: 75.6°F

The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in September: 56.5°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).

Average pressure in September
Coopersburg, PA

Average pressure in September - Coopersburg, PA
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Coopersburg, PA

Average wind speed in September - Coopersburg, PA
  • Average wind speed in September: 5.5mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in September
Coopersburg, PA

Average humidity in September - Coopersburg, PA
  • Average humidity in September: 78%

The month with the highest relative humidity is February (81%).
The months with the lowest relative humidity are April and July (75%).

Average rainfall in September
Coopersburg, PA

Average rainfall in September - Coopersburg, PA
  • Average rainfall in September: 1.89"

The wettest months (with the highest rainfall) are May and July (3.07").
The driest month (with the least rainfall) is September (1.89").

Average rainfall days in September
Coopersburg, PA

Average rainfall days in September - Coopersburg, PA
  • Average rainfall days in September: 12 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in September
Coopersburg, PA

Average snowfall in September - Coopersburg, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (4.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Coopersburg, PA

Average snowfall days in September - Coopersburg, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Coopersburg, PA

Average daylight in September / Average sunshine in September - Coopersburg, PA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in September
Coopersburg, PA

Average sunshine days in September - Coopersburg, PA
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is November (18 days).
The month with the least sunshine days is June (11.8 days).

Average UV index in September
Coopersburg, PA

Average UV index in September - Coopersburg, PA
  • Average UV index in September: 4

The months with the highest UV index are May, June and July (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
Coopersburg, PA

Average cloud cover in September - Coopersburg, PA
  • Average cloud cover in September: 39

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in September
Coopersburg, PA

Average visibility in September - Coopersburg, PA
  • Average visibility in September: 5mi

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

Coopersburg, Pennsylvania, USA

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