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 start of September involves a subtle temperature drop, shifting from a warm 79.2°F (26.2°C) in August to an agreeable 72.1°F (22.3°C). In September, South Williamsport encounters an average low-temperature of 51.4°F (10.8°C) during the night.Humidity
The average relative humidity in September is 81%.Rainfall
In South Williamsport, in September, it is raining for 11.2 days, with typically 1.38" (35mm) of accumulated precipitation. In South Williamsport, during the entire year, the rain falls for 145.2 days and collects up to 16.57" (421mm) of precipitation.Snowfall
In South Williamsport, snow does not fall in May through September.Daylight
In September, the average length of the day in South Williamsport, Pennsylvania, is 12h and 28min.On the first day of September in South Williamsport, sunrise is at 6:35 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:51 pm EDT.
Sunshine
In South Williamsport, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index in South Williamsport, Pennsylvania, is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: A daily high UV index of 3 in September leads to these guidelines:
Ensure safety - Imperative it is to shield skin and eyes from damage. Direct Sun exposure should be minimized especially during midday when radiation is most intense. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Frequently asked questions
What are the temperatures in South Williamsport in September?
What is the average humidity in September in South Williamsport?
How many days does it rain in September in South Williamsport?
When it does not snow in South Williamsport?
Does it snow in South Williamsport in September?
What is the average length of the day in September in South Williamsport?
When are sunrise and sunset in September in South Williamsport?
How many hours of sunshine does South Williamsport have in September?
What is the UV index reading in September in South Williamsport?
Average temperature in September
South Williamsport, PA
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in September: 51.4°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
South Williamsport, PA
- Average pressure in September: 30.07"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
South Williamsport, PA
- Average wind speed in September: 5.3mph
The windiest months (with the highest average wind speed) are January, March and April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
South Williamsport, PA
- Average humidity in September: 81%
The month with the highest relative humidity is February (84%).
The months with the lowest relative humidity are April and July (77%).
Average rainfall in September
South Williamsport, PA
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is April (1.93").
The driest month (with the least rainfall) is November (0.94").
Average rainfall days in September
South Williamsport, PA
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is February (7.5 days).
Average snowfall in September
South Williamsport, PA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
South Williamsport, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
South Williamsport, PA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).
Average sunshine days in September
South Williamsport, PA
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in September
South Williamsport, PA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
South Williamsport, PA
- Average cloud cover in September: 41
The months with the most cloud cover are January and February (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in September
South Williamsport, PA
- Average visibility in September: 4mi
The month with the highest visibility is April (6mi).
The month with the lowest visibility is September (4mi).
South Williamsport, Pennsylvania, USA
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