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 shows a slight dip in September, from August's moderately hot 81.5°F (27.5°C) to a still warm 74.3°F (23.5°C). An average low-temperature of 55.6°F (13.1°C) marks the nights throughout September.Humidity
The average relative humidity in September is 78%.Rainfall
In September, in Summerdale, the rain falls for 9.7 days. Throughout September, 0.79" (20mm) of precipitation is accumulated. In Summerdale, during the entire year, the rain falls for 122.3 days and collects up to 11.73" (298mm) of precipitation.Snowfall
In Summerdale, snow does not fall in May through October.Daylight
In Summerdale, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:51 pm EDT.
Sunshine
The average sunshine in September in Summerdale is 9h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests this advice:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Enhance your sun protection with tightly woven, yet airy clothing.
Frequently asked questions
What are the temperatures in Summerdale in September?
What is the average humidity in September in Summerdale?
How much does it rain in Summerdale in September?
When it does not snow in Summerdale?
What is the average length of the day in September in Summerdale?
When are sunrise and sunset in September in Summerdale?
How many hours of sunshine does Summerdale have in September?
What is the UV index intensity in September in Summerdale?
Average temperature in September
Summerdale, 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 (35.1°F).
- Average low temperature in September: 55.6°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 (22.1°F).
Average pressure in September
Summerdale, 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
Summerdale, PA
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is March (8.2mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in September
Summerdale, PA
- Average humidity in September: 78%
The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are March and April (75%).
Average rainfall in September
Summerdale, PA
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is August (1.3").
The driest months (with the least rainfall) are January and February (0.71").
Average rainfall days in September
Summerdale, PA
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is May (13.9 days).
The month with the least rainy days is January (5.7 days).
Average snowfall in September
Summerdale, PA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.3").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Summerdale, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Summerdale, 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: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in September
Summerdale, PA
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is November (21.8 days).
The month with the least sunshine days is July (14.1 days).
Average UV index in September
Summerdale, PA
- Average UV index in September: 4
The months with the highest UV index are May, 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
Summerdale, PA
- Average cloud cover in September: 37
The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Summerdale, PA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Summerdale, Pennsylvania, USA
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