September weather forecast
King of Prussia, PA

Weather in September

September, the first month of the autumn in King of Prussia, is still a warm month, with temperature in the range of an average high of 76.1°F (24.5°C) and an average low of 59°F (15°C).

Temperature

In September, the average high-temperature slightly decreases from 83.3°F (28.5°C) in August to a still moderately hot 76.1°F (24.5°C). The average low-temperature, in King of Prussia, is 59°F (15°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

In September, in King of Prussia, the rain falls for 10.8 days. Throughout September, 0.98" (25mm) of precipitation is accumulated. In King of Prussia, during the entire year, the rain falls for 138.2 days and collects up to 15.59" (396mm) of precipitation.

Snowfall

April, June through November are months without snowfall in King of Prussia.

Daylight

In King of Prussia, Pennsylvania, the average length of the day in September is 12h and 26min.
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, in King of Prussia, Pennsylvania, sunrise is at 6:57 am and sunset at 6:45 pm EDT.

Sunshine

In King of Prussia, the average sunshine in September is 8.8h.

UV index

The average daily maximum UV index in September in King of Prussia is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 temperature in September in King of Prussia?

In September, in King of Prussia, Pennsylvania, the average high-temperature is 76.1°F (24.5°C), and the average low-temperature is 59°F (15°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in August is estimated at 89.6°F (32°C).

What is the average humidity in September in King of Prussia?

The average relative humidity in September is 76%.

How much does it rain in King of Prussia in September?

In King of Prussia, Pennsylvania, in September, it is raining for 10.8 days, with typically 0.98" (25mm) of accumulated precipitation.

When it does not snow in King of Prussia?

April, June through November are months without snowfall in King of Prussia.

What is the average length of the day in September in King of Prussia?

The average day length in September in King of Prussia, Pennsylvania, is 12h and 26min.

When is the sunrise / sunset in September in King of Prussia?

On the first day of September in King of Prussia, 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 6:45 pm EDT.

How long on average sun shines in September in King of Prussia?

In September, the average sunshine duration in King of Prussia, Pennsylvania, is 8.8h.

How high is the UV index in September in King of Prussia?

In September, the average daily maximum UV index in King of Prussia is 4. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
King of Prussia, PA

Average temperature in September - King of Prussia, PA
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in September: 59°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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Average pressure in September
King of Prussia, PA

Average pressure in September - King of Prussia, 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).

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Average wind speed in September
King of Prussia, PA

Average wind speed in September - King of Prussia, PA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

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Average humidity in September
King of Prussia, PA

Average humidity in September - King of Prussia, PA
  • Average humidity in September: 76%

The months with the highest relative humidity are February and October (79%).
The months with the lowest relative humidity are April and July (72%).

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Average rainfall in September
King of Prussia, PA

Average rainfall in September - King of Prussia, PA
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is July (1.89").
The driest month (with the least rainfall) is February (0.91").

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Average rainfall days in September
King of Prussia, PA

Average rainfall days in September - King of Prussia, PA
  • Average rainfall days in September: 10.8 days

The month with the highest number of rainy days is May (16 days).
The month with the least rainy days is November (7.4 days).

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Average snowfall in September
King of Prussia, PA

Average snowfall in September - King of Prussia, PA
  • Average snowfall in September: 0"

The months with the highest snowfall are February and March (0.55").
The months with the least snowfall are April, June, July, August, September, October and November (0").

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Average snowfall days in September
King of Prussia, PA

Average snowfall days in September - King of Prussia, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are April, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
King of Prussia, PA

Average daylight in September / Average sunshine in September - King of Prussia, PA
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 59min).
The month with the shortest days is December (Average daylight: 9h and 23min).

  • Average sunshine in September: 8h and 48min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days in September
King of Prussia, PA

Average sunshine days in September - King of Prussia, PA
  • Average sunshine days in September: 17.3 days

The month with the most sunshine days is November (20.5 days).
The months with the least sunshine days are May and June (12.8 days).

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Average UV index in September
King of Prussia, PA

Average UV index in September - King of Prussia, PA
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 6).
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
King of Prussia, PA

Average cloud cover in September - King of Prussia, PA
  • Average cloud cover in September: 38

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).

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Average visibility in September
King of Prussia, PA

Average visibility in September - King of Prussia, PA
  • Average visibility in September: 5mi

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

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