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
September
Weather in September
Temperature
The decrease of average high-temperatures is mild in September, with a decline from a warm 25.3°C (77.5°F) in August to an enjoyable 19.8°C (67.6°F). During September, the average low-temperature is a cool 11.5°C (52.7°F).Humidity
In September, the average relative humidity is 73%.Rainfall
In Philadelphia, in September, during 10.3 rainfall days, 18mm (0.71") of precipitation is typically accumulated. In Philadelphia, during the entire year, the rain falls for 142 days and collects up to 267mm (10.51") of precipitation.Snowfall
May through October are months without snowfall in Philadelphia.Daylight
In September, the average length of the day is 12h and 40min.On the first day of the month, sunrise is at 06:16 and sunset at 19:51. On the last day of September, sunrise is at 07:04 and sunset at 18:43 CEST.
Sunshine
In Philadelphia, the average sunshine in September is 8.4h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A maximum high UV index of 4 in September translates into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. To guard against the harmful effects of the Sun, minimize exposure during midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Philadelphia?
What is the average humidity in September in Philadelphia?
How many days does it rain in September in Philadelphia?
When it does not snow in Philadelphia?
How many hours of daylight does Philadelphia have in September?
What time are sunrise and sunset in September in Philadelphia?
How many hours of sunshine does Philadelphia have in September?
How high is the UV index in September in Philadelphia?
Average temperature in September
Philadelphia, Germany
- Average high temperature in September: 19.8°C
The warmest month (with the highest average high temperature) is August (25.3°C).
The month with the lowest average high temperature is January (2.3°C).
- Average low temperature in September: 11.5°C
The month with the highest average low temperature is August (15.2°C).
The coldest month (with the lowest average low temperature) is January (-2°C).
Average pressure in September
Philadelphia, Germany
- Average pressure in September: 1017.3mbar
The month with the highest atmospheric pressure is October (1017.4mbar).
The month with the lowest atmospheric pressure is November (1014.3mbar).
Average wind speed in September
Philadelphia, Germany
- Average wind speed in September: 10.8km/h
The windiest month (with the highest average wind speed) is December (14.5km/h).
The calmest month (with the lowest average wind speed) is August (10.1km/h).
Average humidity in September
Philadelphia, Germany
- Average humidity in September: 73%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (67%).
Average rainfall in September
Philadelphia, Germany
- Average rainfall in September: 18mm
The wettest month (with the highest rainfall) is July (39mm).
The driest month (with the least rainfall) is April (11mm).
Average rainfall days in September
Philadelphia, Germany
- Average rainfall days in September: 10.3 days
The month with the highest number of rainy days is July (14.8 days).
The month with the least rainy days is February (8.8 days).
Average snowfall in September
Philadelphia, Germany
- Average snowfall in September: 0mm
The month with the highest snowfall is January (37mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Philadelphia, Germany
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9 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
Philadelphia, Germany
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 42min).
The month with the shortest days is December (Average daylight: 7h and 48min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Philadelphia, Germany
- Average sunshine days in September: 16.9 days
The months with the most sunshine days are September and October (16.9 days).
The month with the least sunshine days is December (12.4 days).
Average UV index in September
Philadelphia, Germany
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in September
Philadelphia, Germany
- Average cloud cover in September: 40
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Philadelphia, Germany
- Average visibility in September: 9km
The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February, November and December (8km).
