September weather forecastMarcus Hook, PA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Marcus Hook, Pennsylvania, with an average temperature varying between 76.6°F (24.8°C) and 60.8°F (16°C).Temperature
The transition into September subtly indicates a reduction in the average high-temperature, down to a still moderately hot 76.6°F (24.8°C) from August's warm 83.5°F (28.6°C). In Marcus Hook, the nighttime temperature averages to a refreshing 60.8°F (16°C) during September.Humidity
The average relative humidity in September is 76%.Rainfall
In Marcus Hook, during September, the rain falls for 12.6 days and regularly aggregates up to 1.73" (44mm) of precipitation. Throughout the year, there are 148.4 rainfall days, and 25.94" (659mm) of precipitation is accumulated.Snowfall
June through October are months without snowfall.Ocean temperature
In Marcus Hook, in September, the average water temperature is 71.4°F (21.9°C).Note: The majority find it unenjoyable to swim in 71.4°F (21.9°C). Breathing becomes tougher as the water temperature descends under 69.8°F (21°C).
Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:45 pm EDT.
Sunshine
In Marcus Hook, the average sunshine in September is 8.9h.UV index
In Marcus Hook, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Note! The Sun's UV radiation gets intensified with the reflection from sand and water.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Marcus Hook, PA
- Average high temperature in September: 76.6°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.4°F).
- Average low temperature in September: 60.8°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in September
Marcus Hook, 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
Marcus Hook, PA
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Marcus Hook, PA
- Average humidity in September: 76%
The months with the highest relative humidity are February, October and December (77%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Marcus Hook, PA
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is August (3.11").
The driest month (with the least rainfall) is January (1.61").
Average rainfall days in September
Marcus Hook, PA
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (7.1 days).
Average snowfall in September
Marcus Hook, PA
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.32").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Marcus Hook, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in September
Marcus Hook, 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
Marcus Hook, PA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 8h and 54min
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 54min).
Average sunshine days in September
Marcus Hook, PA
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Marcus Hook, 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
Marcus Hook, PA
- Average cloud cover in September: 37
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Marcus Hook, 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).
