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 transition to September results in a modest reduction in average high-temperature, moving from 81.7°F (27.6°C) in August to a still moderately hot 74.8°F (23.8°C). During the month of September, South Mountain anticipates a mean low-temperature of 55.9°F (13.3°C).Humidity
In September, the average relative humidity in South Mountain is 79%.Rainfall
September is the month with the least rainfall. Rain falls for 10 days and accumulates 0.55" (14mm) of precipitation.Snowfall
In South Mountain, snow does not fall in May through October.Daylight
In September, the average length of the day in South Mountain is 12h and 26min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:53 pm EDT.
Sunshine
In September, the average sunshine in South Mountain is 8.7h.UV index
The average daily maximum UV index in September in South Mountain, Pennsylvania, is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 4 in September translates into these instructions:
Undertake protective steps - Preventing sun damage is advised. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Frequently asked questions
What is the temperature in September in South Mountain?
What is the average humidity in September in South Mountain?
What is the driest month in South Mountain?
How many days does it rain in September in South Mountain?
When it does not snow in South Mountain?
How many hours of daylight does South Mountain have in September?
What time are sunrise and sunset in September in South Mountain?
How many hours of sunshine does South Mountain have in September?
How high is the UV index in September in South Mountain?
Average temperature in September
South Mountain, PA
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in September
South Mountain, PA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
South Mountain, PA
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is January (8mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in September
South Mountain, PA
- Average humidity in September: 79%
The months with the highest relative humidity are February, May and October (80%).
The month with the lowest relative humidity is July (75%).
Average rainfall in September
South Mountain, PA
- Average rainfall in September: 0.55"
The wettest month (with the highest rainfall) is May (1.26").
The driest month (with the least rainfall) is September (0.55").
Average rainfall days in September
South Mountain, PA
- Average rainfall days in September: 10 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is January (5.4 days).
Average snowfall in September
South Mountain, PA
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.06").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
South Mountain, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
South Mountain, 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 4min
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
South Mountain, PA
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is November (21.7 days).
The month with the least sunshine days is May (12.9 days).
Average UV index in September
South Mountain, PA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
South Mountain, PA
- Average cloud cover in September: 38
The months with the most cloud cover are January and February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
South Mountain, PA
- Average visibility in September: 5mi
The months with the highest visibility are March, April, June, July, November and December (6mi).
The months with the lowest visibility are January, February, May, August, September and October (5mi).
South Mountain, Pennsylvania, USA
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