September weather forecastPlymouth Meeting, PA
September
Weather in September
September, the first month of the autumn in Plymouth Meeting, is also a moderately hot month, with an average temperature fluctuating between 15°C and 24.5°C.Temperature
September indicates a minor shift in the average high-temperature, from August's 28.5°C to a still warm 24.5°C. Throughout the nights in September, an average low-temperature of 15°C is noted.Humidity
In September, the average relative humidity is 76%.Rainfall
In Plymouth Meeting, in September, it is raining for 10.8 days, with typically 25mm of accumulated precipitation. Throughout the year, in Plymouth Meeting, there are 138.2 rainfall days, and 396mm of precipitation is accumulated.Snowfall
In Plymouth Meeting, snow does not fall in April, June through November.Daylight
In Plymouth Meeting, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:44 pm EDT.
Sunshine
In Plymouth Meeting, the average sunshine in September is 8.8h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Take precautions - Protection against skin and eye damage is obliged. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Plymouth Meeting, PA
- Average high temperature in September: 24.5°C
The warmest month (with the highest average high temperature) is July (29.8°C).
The month with the lowest average high temperature is January (2.6°C).
- Average low temperature in September: 15°C
The month with the highest average low temperature is July (19.7°C).
The coldest month (with the lowest average low temperature) is January (-4.3°C).
Average pressure in September
Plymouth Meeting, PA
- Average pressure in September: 1017.8mbar
The month with the highest atmospheric pressure is November (1020.1mbar).
The month with the lowest atmospheric pressure is June (1013.8mbar).
Average wind speed in September
Plymouth Meeting, PA
- Average wind speed in September: 9.2km/h
The windiest month (with the highest average wind speed) is March (13.4km/h).
The calmest month (with the lowest average wind speed) is August (8.5km/h).
Average humidity in September
Plymouth Meeting, PA
- Average humidity in September: 76%
The months with the highest relative humidity are February and October (79%).
The months with the lowest relative humidity are April and July (72%).
Average rainfall in September
Plymouth Meeting, PA
- Average rainfall in September: 25mm
The wettest month (with the highest rainfall) is July (48mm).
The driest month (with the least rainfall) is February (23mm).
Average rainfall days in September
Plymouth Meeting, PA
- Average rainfall days in September: 10.8 days
The month with the highest number of rainy days is May (16 days).
The month with the least rainy days is November (7.4 days).
Average snowfall in September
Plymouth Meeting, PA
- Average snowfall in September: 0mm
The months with the highest snowfall are February and March (14mm).
The months with the least snowfall are April, June, July, August, September, October and November (0mm).
Average snowfall days in September
Plymouth Meeting, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are April, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Plymouth Meeting, PA
- Average daylight in September: 12h and 24min
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 48min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Plymouth Meeting, PA
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is November (20.5 days).
The months with the least sunshine days are May and June (12.8 days).
Average UV index in September
Plymouth Meeting, PA
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (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
Plymouth Meeting, PA
- Average cloud cover in September: 38
The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Plymouth Meeting, PA
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (9km).
The months with the lowest visibility are May and September (8km).
