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
Long Neck experiences an average high-temperature of a still moderately hot 75.7°F (24.3°C) in September, subtly different from August's 81°F (27.2°C). Long Neck sees an average low-temperature of 65.5°F (18.6°C) during September.Humidity
The average relative humidity in September is 79%.Rainfall
In Long Neck, in September, it is raining for 13.8 days, with typically 2.13" (54mm) of accumulated precipitation. In Long Neck, during the entire year, the rain falls for 147.1 days and collects up to 25.59" (650mm) of precipitation.Snowfall
April through October are months without snowfall.Ocean temperature
In Long Neck, Delaware, the average seawater temperature in September is 72.9°F (22.7°C).Note: For someone sensitive to cold, swimming in 72.9°F (22.7°C) waters can be invigorating, especially when considering elements like sunshine, wind, and current air temperature. (As a reference, Olympic swimming waters are kept between 77°F (25°C) and 82.4°F (28°C).)
Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:30 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:44 pm EDT.
Sunshine
The average sunshine in September in Long Neck is 9.3h.UV index
The average daily maximum UV index in September in Long Neck is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Take note! The UV strength of the Sun elevates when reflected off water and sand.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Long Neck in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
How warm is the water in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Long Neck have in September?
What is the UV index reading in September?
Average temperature in September
Long Neck, DE
- Average high temperature in September: 75.7°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (41.7°F).
- Average low temperature in September: 65.5°F
The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (31.5°F).
Average pressure in September
Long Neck, DE
- Average pressure in September: 30.04"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
Long Neck, DE
- Average wind speed in September: 8.8mph
The windiest months (with the highest average wind speed) are January, February and March (11.1mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in September
Long Neck, DE
- Average humidity in September: 79%
The month with the highest relative humidity is May (81%).
The months with the lowest relative humidity are January and November (74%).
Average rainfall in September
Long Neck, DE
- Average rainfall in September: 2.13"
The wettest months (with the highest rainfall) are July and August (2.95").
The driest month (with the least rainfall) is January (1.46").
Average rainfall days in September
Long Neck, DE
- Average rainfall days in September: 13.8 days
The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is January (7.4 days).
Average snowfall in September
Long Neck, DE
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.22").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Long Neck, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Long Neck, DE
- Average sea temperature in September: 72.8°F
The best month for swimming (with the highest average sea temperature) is August (76.9°F).
The coldest month (with the lowest average sea temperature) is February (40.7°F).
Average daylight in September /
Average sunshine in September
Long Neck, DE
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in September
Long Neck, DE
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is January (20.1 days).
The month with the least sunshine days is July (12.2 days).
Average UV index in September
Long Neck, 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 and December (UV index 2).
Average cloud cover in September
Long Neck, DE
- Average cloud cover in September: 32
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Long Neck, 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).
Long Neck, Delaware, USA
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