September weather forecast
Summit Lawn, PA

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Weather in September

September, the first month of the autumn in Summit Lawn, is also a moderately hot month, with an average temperature fluctuating between 74.3°F (23.5°C) and 55°F (12.8°C).

Temperature

Summit Lawn's transition into September involves a gentle shift in temperature, receding from 81°F (27.2°C) in August to a still moderately hot 74.3°F (23.5°C). Summit Lawn cools down to an average low-temperature of 55°F (12.8°C) throughout the month of September.

Humidity

The average relative humidity in September in Summit Lawn is 79%.

Rainfall

The month with the least rainfall is September, when the rain falls for 11.5 days and typically collects 1.61" (41mm) of precipitation.

Snowfall

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

Daylight

In Summit Lawn, the average length of the day in September is 12h and 27min.
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 6:45 pm EDT.

Sunshine

In Summit Lawn, Pennsylvania, the average sunshine in September is 8.7h.

UV index

The average daily maximum UV index in September in Summit Lawn, Pennsylvania, is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: In September, the maximum UV index of 4 translates into these guidelines:
Put precautions into practice - Protective measures against sun-induced damage are advised. Around midday, solar radiation is most harmful; hence, exposure should be limited. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Summit Lawn in September?

The high-temperature during September is 74.3°F (23.5°C) and the low-temperature is 55°F (12.8°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, 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?

September is the month with the least rainfall in Summit Lawn. Rain falls for 11.5 days and accumulates 1.61" (41mm) of precipitation.

How many days does it rain in September?

In Summit Lawn, in September, it is raining for 11.5 days, with typically 1.61" (41mm) of accumulated precipitation.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

What is the average length of the day in September?

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

When is the sunrise / sunset in September in Summit Lawn?

In September, on the first day of the month, 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?

The average sunshine duration in September in Summit Lawn is 8.7h.

How high is the UV index in September?

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health 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
Summit Lawn, PA

Average temperature in September - Summit Lawn, PA
  • Average high temperature in September: 74.3°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in September
Summit Lawn, PA

Average pressure in September - Summit Lawn, 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
Summit Lawn, PA

Average wind speed in September - Summit Lawn, 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
Summit Lawn, PA

Average humidity in September - Summit Lawn, PA
  • Average humidity in September: 79%

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

Average rainfall in September
Summit Lawn, PA

Average rainfall in September - Summit Lawn, PA
  • Average rainfall in September: 1.61"

The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is September (1.61").

Average rainfall days in September
Summit Lawn, PA

Average rainfall days in September - Summit Lawn, PA
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.7 days).

Average snowfall in September
Summit Lawn, PA

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

The month with the highest snowfall is March (4.37").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Summit Lawn, PA

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

The month with the highest number of snowfall days is February (6.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Summit Lawn, 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 24min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).

Average sunshine days in September
Summit Lawn, PA

Average sunshine days in September - Summit Lawn, PA
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is January (20.5 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in September
Summit Lawn, PA

Average UV index in September - Summit Lawn, 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
Summit Lawn, PA

Average cloud cover in September - Summit Lawn, PA
  • Average cloud cover in September: 39

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in September
Summit Lawn, PA

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

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

Summit Lawn, Pennsylvania, USA

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