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 average high-temperature slightly decreases in September, shifting from 82.2°F (27.9°C) in August to a still moderately hot 75.7°F (24.3°C). Castle Shannon, during the month of September, experiences an average low-temperature of 55.9°F (13.3°C).Humidity
In Castle Shannon, the average relative humidity in September is 76%.Rainfall
In September, the rain falls for 13.5 days. Throughout September, 2.2" (56mm) of precipitation is accumulated. Throughout the year, in Castle Shannon, Pennsylvania, there are 164 rainfall days, and 26.89" (683mm) of precipitation is accumulated.Snowfall
In Castle Shannon, snow does not fall in May through September.Daylight
The average length of the day in September in Castle Shannon is 12h and 27min.On the first day of the month, sunrise is at 6:48 am and sunset at 7:51 pm. On the last day of September, in Castle Shannon, sunrise is at 7:16 am and sunset at 7:03 pm EDT.
Sunshine
In Castle Shannon, the average sunshine in September is 8.4h.UV index
In Castle Shannon, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: In September, a regular UV index of 4 translates into these guidelines:
Be vigilant - A duty to shield skin and eyes from injury exists. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Frequently asked questions
What are September temperatures in Castle Shannon?
What is the average humidity in September in Castle Shannon?
How much does it rain in Castle Shannon in September?
When it does not snow in Castle Shannon?
Does it snow in Castle Shannon in September?
How many hours of daylight does Castle Shannon have in September?
When is the sunrise / sunset in September in Castle Shannon?
How many hours of sunshine does Castle Shannon have in September?
What is the UV index intensity in September in Castle Shannon?
Average temperature in September
Castle Shannon, PA
- Average high temperature in September: 75.7°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 (33.4°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in September
Castle Shannon, PA
- Average pressure in September: 30.05"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
Castle Shannon, PA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Castle Shannon, PA
- Average humidity in September: 76%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is August (73%).
Average rainfall in September
Castle Shannon, PA
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is November (1.61").
Average rainfall days in September
Castle Shannon, PA
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is January (8.5 days).
Average snowfall in September
Castle Shannon, PA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.46").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Castle Shannon, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (16.3 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
Castle Shannon, 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 2min
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
Castle Shannon, PA
- Average sunshine days in September: 14 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is February (9.5 days).
Average UV index in September
Castle Shannon, 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
Castle Shannon, PA
- Average cloud cover in September: 39
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Castle Shannon, PA
- Average visibility in September: 5mi
The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January, February, March, May, September, October and December (5mi).
Castle Shannon, Pennsylvania, USA
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