September weather forecast
Stony Run, PA

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Weather in September

September, the first month of the autumn in Stony Run, is still a warm month, with an average temperature ranging between max 74.3°F (23.5°C) and min 55°F (12.8°C).

Temperature

The advent of September brings a subtle shift in temperature, with the average high moving from a warm 81.1°F (27.3°C) in August to a still moderately hot 74.3°F (23.5°C). September nights experience a consistent temperature drop to a cool 55°F (12.8°C).

Humidity

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

Rainfall

The month with the least rainfall is September, when the rain falls for 11.5 days and typically collects 1.54" (39mm) of precipitation.

Snowfall

In Stony Run, snow does not fall in May through September.

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of the month, sunrise is at 6:31 am and sunset at 7:34 pm. On the last day of September, sunrise is at 6:59 am and sunset at 6:46 pm EDT.

Sunshine

In September, the average sunshine is 8.8h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: A maximum daily UV index of 4 during September morphs into the following directions:
Heed the precautions - Suggestions to avoid sunburn are made. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Enhance your sun protection with tightly woven, yet airy clothing.

Frequently asked questions

What is the average September temperature?

The high-temperature during September is 74.3°F (23.5°C) and the low-temperature is 55°F (12.8°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 86°F (30°C).

What is the average humidity in September?

In September, the average relative humidity is 79%.

What is the driest month?

The month with the least rainfall in Stony Run is September, when the rain falls for 11.5 days and typically collects 1.54" (39mm) of precipitation.

How much does it rain in September?

In September, the rain falls for 11.5 days. Throughout September, 1.54" (39mm) of precipitation is accumulated.

When it does not snow?

May through September are months without snowfall.

Does it snow in September?

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

What is the average length of the day in September?

In Stony Run, the average day length in September is 12h and 27min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:31 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:46 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.8h.

How high is the UV index in September?

In Stony Run, the average daily maximum UV index in September is 4. A UV Index reading 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 daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Stony Run, PA

Average temperature in September - Stony Run, PA
  • Average high temperature in September: 74.3°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).

Average pressure in September
Stony Run, PA

Average pressure in September - Stony Run, 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
Stony Run, PA

Average wind speed in September - Stony Run, PA
  • Average wind speed in September: 5.4mph

The windiest month (with the highest average wind speed) is March (8.2mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in September
Stony Run, PA

Average humidity in September - Stony Run, PA
  • Average humidity in September: 79%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).

Average rainfall in September
Stony Run, PA

Average rainfall in September - Stony Run, PA
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is August (2.8").
The driest month (with the least rainfall) is September (1.54").

Average rainfall days in September
Stony Run, PA

Average rainfall days in September - Stony Run, PA
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (7.2 days).

Average snowfall in September
Stony Run, PA

Average snowfall in September - Stony Run, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (4.02").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Stony Run, PA

Average snowfall days in September - Stony Run, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (7.8 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
Stony Run, PA

Average daylight in September / Average sunshine in September - Stony Run, PA
  • Average daylight in September: 12h and 3min

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 5min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in September
Stony Run, PA

Average sunshine days in September - Stony Run, PA
  • Average sunshine days in September: 16.1 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is May (11 days).

Average UV index in September
Stony Run, PA

Average UV index in September - Stony Run, PA
  • Average UV index in September: 4

The months with the highest UV index are 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
Stony Run, PA

Average cloud cover in September - Stony Run, PA
  • Average cloud cover in September: 38

The months with the most cloud cover are February and December (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in September
Stony Run, PA

Average visibility in September - Stony Run, PA
  • Average visibility in September: 5mi

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

Stony Run, Pennsylvania, USA

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