September weather forecastWilmington, NC
September
Weather in September
Wilmington's September weather records a further drop in temperature. This welcomes a comfortable climate while still maintaining a warm sea temperature of 80.4°F (26.9°C). Rainfall decreases slightly and the autumn vibe begins to permeate. The lower humidity levels and lesser crowds encourage more visits to the historic downtown district. September in Wilmington also rings as the city's cultural prime as the local arts and craft scene sprouts in various street festivals.Temperature
The beginning of September reveals an average high-temperature of a moderately hot 82.2°F (27.9°C), showing minimal deviation from the previous month. In Wilmington, September nights cool down to an average of 70.3°F (21.3°C).Heat index
The heat index in September is computed to be a tropical 87.8°F (31°C). Fatigue might occur with continuous exposure and activity, potentially causing heat cramps.Observations indicate that the heat index values are for shady locations with light wind. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
Humidity
The months with the highest humidity are August, September and December, with an average relative humidity of 77%.Rainfall
In September, in Wilmington, the rain falls for 17.7 days. Throughout September, 5.39" (137mm) of precipitation is accumulated. In Wilmington, during the entire year, the rain falls for 182.5 days and collects up to 41.42" (1052mm) of precipitation.Snowfall
April through December are months without snowfall.Ocean temperature
In September, the average ocean temperature in Wilmington is 80.4°F (26.9°C).Note: Surface water temperatures ranging from 77°F (25°C) to 84.2°F (29°C) are seen as ideal and highly pleasant for extended enjoyment in all water activities.
Daylight
In September, the average length of the day in Wilmington is 12h and 23min.On the first day of the month, sunrise is at 6:45 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:56 pm EDT.
Sunshine
In Wilmington, the average sunshine in September is 9.4h.UV index
In Wilmington, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The daily maximum UV index of 6 in September interprets into the following advice:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Notice! The reflection of water and sand increases the UV radiation significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Wilmington, NC
- Average high temperature in September: 82.2°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (54°F).
- Average low temperature in September: 70.3°F
The month with the highest average low temperature is July (75.4°F).
The coldest month (with the lowest average low temperature) is January (40.1°F).
Average pressure in September
Wilmington, NC
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January and December (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Wilmington, NC
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in September
Wilmington, NC
- Average humidity in September: 77%
The months with the highest relative humidity are August, September and December (77%).
The months with the lowest relative humidity are January and March (73%).
Average rainfall in September
Wilmington, NC
- Average rainfall in September: 5.39"
The wettest month (with the highest rainfall) is August (5.59").
The driest month (with the least rainfall) is January (1.93").
Average rainfall days in September
Wilmington, NC
- Average rainfall days in September: 17.7 days
The month with the highest number of rainy days is August (22.3 days).
The month with the least rainy days is November (10.6 days).
Average snowfall in September
Wilmington, NC
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.75").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Wilmington, NC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Wilmington, NC
- Average sea temperature in September: 80.4°F
The best month for swimming (with the highest average sea temperature) is August (82.8°F).
The coldest month (with the lowest average sea temperature) is February (57.5°F).
Average daylight in September /
Average sunshine in September
Wilmington, NC
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 9h and 24min
The months with the most sunshine are June and July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Wilmington, NC
- Average sunshine days in September: 9.8 days
The month with the most sunshine days is October (18.1 days).
The month with the least sunshine days is August (6.3 days).
Average UV index in September
Wilmington, NC
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).
Average cloud cover in September
Wilmington, NC
- Average cloud cover in September: 31
The months with the most cloud cover are February and December (Cloud cover 40).
The months with the least cloud cover are June and July (Cloud cover 27).
Average visibility in September
Wilmington, NC
- 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).
