Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The transition to September results in a modest reduction in average high-temperature, moving from a moderately hot 81.1°F (27.3°C) in August to a still warm 74.5°F (23.6°C). In Penn, the average low-temperature during the month of September is a fresh 54.5°F (12.5°C).Humidity
The average relative humidity in September is 78%.Rainfall
In Penn, during September, the rain falls for 15.2 days and regularly aggregates up to 2.48" (63mm) of precipitation. Throughout the year, in Penn, there are 183.8 rainfall days, and 35.16" (893mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Penn.Daylight
In Penn, Pennsylvania, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:46 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:01 pm EDT.
Sunshine
The average sunshine in September in Penn is 8.7h.UV index
In September, the average daily maximum UV index in Penn is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Frequently asked questions
What is the usual temperature for Penn in September?
What is the average humidity in September in Penn?
How much does it rain in Penn in September?
When it does not snow in Penn?
Does it snow in Penn in September?
What is the average length of the day in September in Penn?
When are sunrise and sunset in September in Penn?
How many hours of sunshine does Penn have in September?
What is the UV index intensity in September in Penn?
Average temperature in September
Penn, PA
- Average high temperature in September: 74.5°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure in September
Penn, PA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Penn, PA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Penn, PA
- Average humidity in September: 78%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April, July and August (77%).
Average rainfall in September
Penn, PA
- Average rainfall in September: 2.48"
The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is November (2.09").
Average rainfall days in September
Penn, PA
- Average rainfall days in September: 15.2 days
The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is January (9.5 days).
Average snowfall in September
Penn, PA
- Average snowfall in September: 0"
The month with the highest snowfall is January (7.05").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Penn, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Penn, 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 24min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in September
Penn, PA
- Average sunshine days in September: 12.9 days
The month with the most sunshine days is November (14 days).
The month with the least sunshine days is February (6.7 days).
Average UV index in September
Penn, PA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Penn, PA
- Average cloud cover in September: 38
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Penn, PA
- Average visibility in September: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January and February (4mi).
Penn, Pennsylvania, USA
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