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
As September begins, there is a minor decrease in the average high-temperature, softly falling from a warm 76.6°F (24.8°C) in August to a pleasant 69.8°F (21°C). The average temperature in Knoxville drops to a frosty 49.5°F (9.7°C) during the night in the month of September.Humidity
In Knoxville, Pennsylvania, the average relative humidity in September is 81%.Rainfall
In September, in Knoxville, the rain falls for 13.4 days. Throughout September, 2.13" (54mm) of precipitation is accumulated. Throughout the year, there are 168.3 rainfall days, and 28.19" (716mm) of precipitation is accumulated.Snowfall
In Knoxville, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:42 pm. On the last day of September, in Knoxville, sunrise is at 7:06 am and sunset at 6:52 pm EDT.
Sunshine
In Knoxville, Pennsylvania, the average sunshine in September is 8.3h.UV index
In September, the average daily maximum UV index in Knoxville, Pennsylvania, is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 3 suggests this advice:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Frequently asked questions
What is the usual temperature for Knoxville in September?
What is the average humidity in September in Knoxville?
How many days does it rain in September in Knoxville?
When it does not snow in Knoxville?
Does it snow in Knoxville in September?
What is the average length of the day in September in Knoxville?
When are sunrise and sunset in September in Knoxville?
How long on average sun shines in September in Knoxville?
How high is the UV index in September in Knoxville?
Average temperature in September
Knoxville, PA
- Average high temperature in September: 69.8°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in September: 49.5°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).
Average pressure in September
Knoxville, PA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Knoxville, PA
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in September
Knoxville, PA
- Average humidity in September: 81%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April, May and June (78%).
Average rainfall in September
Knoxville, PA
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is November (1.81").
Average rainfall days in September
Knoxville, PA
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (18.9 days).
The month with the least rainy days is February (7.2 days).
Average snowfall in September
Knoxville, PA
- Average snowfall in September: 0"
The month with the highest snowfall is February (7.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Knoxville, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Knoxville, PA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 6min).
Average sunshine days in September
Knoxville, PA
- Average sunshine days in September: 14.9 days
The month with the most sunshine days is September (14.9 days).
The month with the least sunshine days is February (7.1 days).
Average UV index in September
Knoxville, PA
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Knoxville, PA
- Average cloud cover in September: 44
The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 39).
Average visibility in September
Knoxville, PA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
Knoxville, Pennsylvania, USA
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