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
September marks a gentle change in average high-temperature, declining from August's warm 83.5°F (28.6°C) to a still moderately hot 77°F (25°C). In Port Penn, in September, the average low-temperature is a comfortable 61.2°F (16.2°C).Humidity
May, June, September and October, with an average relative humidity of 77%, are the most humid months.Rainfall
In Port Penn, in September, during 11.9 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. In Port Penn, during the entire year, the rain falls for 147.7 days and collects up to 27.8" (706mm) of precipitation.Snowfall
In Port Penn, snow does not fall in June through October.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:45 pm EDT.
Sunshine
In Port Penn, the average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Act with care - The need to guard against sun damage is communicated. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Port Penn in September?
What is the most humid month?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Port Penn have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September in Port Penn?
What is the UV index reading in September?
Average temperature in September
Port Penn, DE
- Average high temperature in September: 77°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (38.7°F).
- Average low temperature in September: 61.2°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (27°F).
Average pressure in September
Port Penn, DE
- 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
Port Penn, DE
- Average wind speed in September: 6.2mph
The windiest months (with the highest average wind speed) are February, March and April (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in September
Port Penn, DE
- Average humidity in September: 77%
The months with the highest relative humidity are May, June, September and October (77%).
The month with the lowest relative humidity is April (72%).
Average rainfall in September
Port Penn, DE
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is August (3.23").
The driest month (with the least rainfall) is January (1.77").
Average rainfall days in September
Port Penn, DE
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is November (8 days).
Average snowfall in September
Port Penn, DE
- 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
Port Penn, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.2 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Port Penn, DE
- Average daylight in September: 12h and 2min
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: 9h and 1min
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
Port Penn, DE
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is November (20.6 days).
The months with the least sunshine days are May and July (11.8 days).
Average UV index in September
Port Penn, DE
- 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 and December (UV index 2).
Average cloud cover in September
Port Penn, DE
- Average cloud cover in September: 36
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Port Penn, DE
- 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).
Port Penn, Delaware, USA
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