September weather forecast
Glen Summit, PA

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Weather in September

The first month of the autumn, September, is still a pleasant month in Glen Summit, Pennsylvania, with an average temperature ranging between min 51.6°F (10.9°C) and max 71.4°F (21.9°C).

Temperature

The transition into September subtly indicates a reduction in the average high-temperature, down to an agreeable 71.4°F (21.9°C) from August's warm 78.3°F (25.7°C). Throughout September, Glen Summit anticipates an average low-temperature of 51.6°F (10.9°C).

Humidity

The average relative humidity in September is 80%.

Rainfall

The month with the least rainfall is September, when the rain falls for 9.9 days and typically collects 0.71" (18mm) of precipitation.

Snowfall

In Glen Summit, Pennsylvania, snow does not fall in June through September.

Daylight

In Glen Summit, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:30 am and sunset at 7:35 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 in Glen Summit is 8.6h.

UV index

In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: In September, a regular UV index of 3 translates into these guidelines:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Updated: Aug 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

September temperatures vary between a high-temperature of 71.4°F (21.9°C) and a low-temperature of 51.6°F (10.9°C). In July, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is evaluated at 86°F (30°C).

What is the average humidity in September?

In Glen Summit, the average relative humidity in September is 80%.

What is the driest month?

The month with the least rainfall in Glen Summit, Pennsylvania, is September, when the rain falls for 9.9 days and typically collects 0.71" (18mm) of precipitation.

How much does it rain in September?

In Glen Summit, in September, it is raining for 9.9 days, with typically 0.71" (18mm) of accumulated precipitation.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

What is the average length of the day in September?

The average day length in September is 12h and 28min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:30 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:46 pm EDT.

How many hours of sunshine does Glen Summit have in September?

The average sunshine duration in September is 8.6h.

What is the UV index reading in September?

The average daily maximum UV index in September in Glen Summit is 3. 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
Glen Summit, PA

Average temperature in September - Glen Summit, PA
  • Average high temperature in September: 71.4°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in September: 51.6°F

The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).

Average pressure in September
Glen Summit, PA

Average pressure in September - Glen Summit, PA
  • Average pressure in September: 30.07"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
Glen Summit, PA

Average wind speed in September - Glen Summit, PA
  • Average wind speed in September: 5.8mph

The windiest months (with the highest average wind speed) are March and April (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in September
Glen Summit, PA

Average humidity in September - Glen Summit, PA
  • Average humidity in September: 80%

The months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is April (77%).

Average rainfall in September
Glen Summit, PA

Average rainfall in September - Glen Summit, PA
  • Average rainfall in September: 0.71"

The wettest month (with the highest rainfall) is July (1.5").
The driest month (with the least rainfall) is September (0.71").

Average rainfall days in September
Glen Summit, PA

Average rainfall days in September - Glen Summit, PA
  • Average rainfall days in September: 9.9 days

The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in September
Glen Summit, PA

Average snowfall in September - Glen Summit, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.83").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Glen Summit, PA

Average snowfall days in September - Glen Summit, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Glen Summit, PA

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

The month with the longest days is June (Average daylight: 15h and 6min).
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 12min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).

Average sunshine days in September
Glen Summit, PA

Average sunshine days in September - Glen Summit, PA
  • Average sunshine days in September: 16.8 days

The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is February (11.6 days).

Average UV index in September
Glen Summit, PA

Average UV index in September - Glen Summit, PA
  • Average UV index in September: 3

The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September
Glen Summit, PA

Average cloud cover in September - Glen Summit, PA
  • Average cloud cover in September: 42

The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 36).

Average visibility in September
Glen Summit, PA

Average visibility in September - Glen Summit, PA
  • Average visibility in September: 5mi

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

Glen Summit, Pennsylvania, USA

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