September weather forecast
Oak Island, NC

Weather in September

September, the first month of the autumn in Oak Island, is still a warm month, with an average temperature ranging between min 72.5°F (22.5°C) and max 81.9°F (27.7°C).

Temperature

In Oak Island, the average high-temperature in September is practically the same as in August - a still warm 81.9°F (27.7°C). In September, the average low-temperature is 72.5°F (22.5°C).

Heat index

In September, the average heat index is estimated at a hot 87.8°F (31°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like wind, metabolic differences, differences in body mass, height, and shape, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in September in Oak Island is 76%.

Rainfall

In Oak Island, during September, the rain falls for 15.5 days and regularly aggregates up to 3.27" (83mm) of precipitation. Throughout the year, there are 157.9 rainfall days, and 24.69" (627mm) of precipitation is accumulated.

Snowfall

In Oak Island, snow does not fall in February through December.

Ocean temperature

In Oak Island, the average seawater temperature in September is 80.2°F (26.8°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In September, the average length of the day is 12h and 22min.
On the first day of the month, sunrise is at 6:46 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:58 pm EDT.

Sunshine

In Oak Island, the average sunshine in September is 9.5h.

UV index

In Oak Island, North Carolina, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
[Resources]

FAQ

What is the temperature in September in Oak Island?

In September, in Oak Island, the average high-temperature is 81.9°F (27.7°C), and the average low-temperature is 72.5°F (22.5°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in September is estimated at 87.8°F (31°C).

What is the average humidity in September in Oak Island?

The average relative humidity in September is 76%.

How many days does it rain in September in Oak Island?

In Oak Island, North Carolina, in September, it is raining for 15.5 days, with typically 3.27" (83mm) of accumulated precipitation.

When it does not snow in Oak Island?

February through December are months without snowfall in Oak Island, North Carolina.

How warm is the water in September in Oak Island?

In Oak Island, the average seawater temperature in September is 80.2°F (26.8°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Oak Island have in September?

In Oak Island, North Carolina, the average day length in September is 12h and 22min.

What time are sunrise and sunset in September in Oak Island?

In September, on the first day of the month, sunrise is at 6:46 am and sunset at 7:39 pm. On the last day of the month, in Oak Island, North Carolina, sunrise is at 7:06 am and sunset at 6:58 pm EDT.

How many hours of sunshine does Oak Island have in September?

The average sunshine duration in September in Oak Island is 9.5h.

What is the UV index intensity in September in Oak Island?

In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Oak Island, NC

Average temperature in September - Oak Island, NC
  • Average high temperature in September: 81.9°F

The warmest months (with the highest average high temperature) are July and August (85.6°F).
The month with the lowest average high temperature is January (55°F).

  • Average low temperature in September: 72.5°F

The month with the highest average low temperature is July (77.4°F).
The coldest month (with the lowest average low temperature) is January (43.7°F).

[Resources]

Average pressure in September
Oak Island, NC

Average pressure in September - Oak Island, NC
  • Average pressure in September: 30"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).

[Resources]

Average wind speed in September
Oak Island, NC

Average wind speed in September - Oak Island, NC
  • Average wind speed in September: 9.9mph

The windiest month (with the highest average wind speed) is February (11.6mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).

[Resources]

Average humidity in September
Oak Island, NC

Average humidity in September - Oak Island, NC
  • Average humidity in September: 76%

The month with the highest relative humidity is June (78%).
The months with the lowest relative humidity are January, March, October and November (74%).

[Resources]

Average rainfall in September
Oak Island, NC

Average rainfall in September - Oak Island, NC
  • Average rainfall in September: 3.27"

The wettest month (with the highest rainfall) is August (3.7").
The driest month (with the least rainfall) is January (0.83").

[Resources]

Average rainfall days in September
Oak Island, NC

Average rainfall days in September - Oak Island, NC
  • Average rainfall days in September: 15.5 days

The month with the highest number of rainy days is August (19.1 days).
The month with the least rainy days is November (8.4 days).

[Resources]

Average snowfall in September
Oak Island, NC

Average snowfall in September - Oak Island, NC
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

[Resources]

Average snowfall days in September
Oak Island, NC

Average snowfall days in September - Oak Island, NC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are February, April, May, June, July, August, September, October and November (0 days).

[Resources]

Average sea temperature in September
Oak Island, NC

Average sea temperature in September - Oak Island, NC
  • Average sea temperature in September: 80.3°F

The best month for swimming (with the highest average sea temperature) is August (82.7°F).
The coldest month (with the lowest average sea temperature) is March (56°F).

[Resources]

Average daylight in September /
Average sunshine in September
Oak Island, NC

Average daylight in September / Average sunshine in September - Oak Island, NC
  • Average daylight in September: 12h and 22min

The month with the longest days is June (Average daylight: 14h and 23min).
The month with the shortest days is December (Average daylight: 9h and 56min).

  • Average sunshine in September: 9h and 30min

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).

[Resources]

Average sunshine days in September
Oak Island, NC

Average sunshine days in September - Oak Island, NC
  • Average sunshine days in September: 11.6 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is August (7.8 days).

[Resources]

Average UV index in September
Oak Island, NC

Average UV index in September - Oak Island, NC
  • Average UV index in September: 6

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).

[Resources]

Average cloud cover in September
Oak Island, NC

Average cloud cover in September - Oak Island, NC
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 41).
The month with the least cloud cover is June (Cloud cover 26).

[Resources]

Average visibility in September
Oak Island, NC

Average visibility in September - Oak Island, 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location