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 sea temperature 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
In September, the average high-temperature slightly decreases from a warm 84°F (28.9°C) in August to a still moderately hot 76.6°F (24.8°C). In Philadelphia, Pennsylvania, the average low-temperature is 61.2°F (16.2°C).Humidity
In Philadelphia, the average relative humidity in September is 75%.Rainfall
In Philadelphia, it is raining for 10.5 days, with typically 0.87" (22mm) of accumulated precipitation. Throughout the year, in Philadelphia, there are 127.8 rainfall days, and 13.82" (351mm) of precipitation is accumulated.Snowfall
June through October are months without snowfall in Philadelphia.Ocean temperature
In Philadelphia, the average water temperature is 71.4°F (21.9°C).Note: For swimming, a surface water temperature of 71.4°F (21.9°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).
Daylight
In Philadelphia, Pennsylvania, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:28 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:45 pm EDT.
Sunshine
In Philadelphia, the average sunshine in September is 8.8h.UV index
In September, the average daily maximum UV index in Philadelphia is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
FAQ
What is the temperature in September in Philadelphia?
What is the average humidity in September in Philadelphia?
How much does it rain in Philadelphia in September?
When it does not snow in Philadelphia?
What is the ocean temperature in September in Philadelphia?
How many hours of daylight does Philadelphia have in September?
When is the sunrise / sunset in September in Philadelphia?
How many hours of sunshine does Philadelphia have in September?
What is the UV index reading in September in Philadelphia?
Average temperature in September
Philadelphia, PA
- Average high temperature in September: 76.6°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (37.4°F).
- Average low temperature in September: 61.2°F
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (25.5°F).
Average pressure in September
Philadelphia, PA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Philadelphia, PA
- Average wind speed in September: 6mph
The windiest months (with the highest average wind speed) are March and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in September
Philadelphia, PA
- Average humidity in September: 75%
The month with the highest relative humidity is October (77%).
The months with the lowest relative humidity are April and August (71%).
Average rainfall in September
Philadelphia, PA
- Average rainfall in September: 0.87"
The wettest month (with the highest rainfall) is August (1.65").
The driest months (with the least rainfall) are January and February (0.83").
Average rainfall days in September
Philadelphia, PA
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is July (14.8 days).
The month with the least rainy days is February (7.2 days).
Average snowfall in September
Philadelphia, PA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.98").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Philadelphia, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in September
Philadelphia, PA
- Average sea temperature in September: 71.4°F
The best month for swimming (with the highest average sea temperature) is August (75.9°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).
Average daylight in September /
Average sunshine in September
Philadelphia, PA
- Average daylight in September: 12h and 26min
The month with the longest days is June (Average daylight: 14h and 58min).
The month with the shortest days is December (Average daylight: 9h and 23min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Philadelphia, PA
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is December (20.9 days).
The month with the least sunshine days is May (13.3 days).
Average UV index in September
Philadelphia, PA
- Average UV index in September: 5
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, November and December (UV index 2).
Average cloud cover in September
Philadelphia, PA
- Average cloud cover in September: 38
The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Philadelphia, PA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
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