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 82°F (27.8°C) in August to a still warm 75.4°F (24.1°C). The average temperature drops to a mild 55.6°F (13.1°C) during the night in the month of September.Humidity
The average relative humidity in September is 77%.Rainfall
In September, the rain falls for 13.1 days. Throughout September, 1.73" (44mm) of precipitation is accumulated. Throughout the year, there are 154.8 rainfall days, and 21.22" (539mm) of precipitation is accumulated.Snowfall
In Sewickley, snow does not fall in June through September.Daylight
In Sewickley, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:48 am and sunset at 7:52 pm. On the last day of September, sunrise is at 7:16 am and sunset at 7:04 pm EDT.
Sunshine
In September, the average sunshine is 8.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: The UV index of 4 in September translates into these instructions:
Exercise prevention - Precautions against solar damage are endorsed. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Sewickley have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Sewickley have in September?
What is the UV index intensity in September?
Average temperature in September
Sewickley, PA
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in September: 55.6°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in September
Sewickley, 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
Sewickley, PA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Sewickley, PA
- Average humidity in September: 77%
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (75%).
Average rainfall in September
Sewickley, PA
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is July (2.36").
The driest month (with the least rainfall) is January (1.22").
Average rainfall days in September
Sewickley, PA
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (8.1 days).
Average snowfall in September
Sewickley, PA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Sewickley, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sewickley, 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 1min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in September
Sewickley, PA
- Average sunshine days in September: 14.1 days
The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is February (10.7 days).
Average UV index in September
Sewickley, PA
- Average UV index in September: 4
The months with the highest UV index are May, June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Sewickley, PA
- Average cloud cover in September: 40
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
Sewickley, PA
- Average visibility in September: 5mi
The months with the highest visibility are April, June, August and November (6mi).
The months with the lowest visibility are January, February, March, May, July, September, October and December (5mi).
Sewickley, Pennsylvania, USA
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