September weather forecast and climate
Mountain Island, NC

Weather in September

The first month of the autumn, September, is also a moderately hot month in Mountain Island, North Carolina, with average temperature ranging between min 62.6°F (17°C) and max 82.2°F (27.9°C).

Temperature

In September, the average high-temperature marginally drops, from a hot 88.3°F (31.3°C) in August, to a warm 82.2°F (27.9°C). In September, the average low-temperature is 62.6°F (17°C).

Heat index

In September, the average heat index is appraised at a tropical 87.6°F (30.9°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity 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', 'felt air temperature', 'real feel', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, clothing, wind, and differences in body mass, height, and shape affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise 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

In September, the average relative humidity in Mountain Island is 73%.

Rainfall

In Mountain Island, during 13.4 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. In Mountain Island, during the entire year, the rain falls for 158.9 days and collects up to 31.26" (794mm) of precipitation.

Snowfall

In Mountain Island snow does not fall in April through October.

Daylight

In September, the average length of the day in Mountain Island is 12.4h.

Sunshine

In Mountain Island, the average sunshine is 8.6h.

UV index

In September, the average daily maximum UV index in Mountain Island, North Carolina, is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
[Resources]

FAQ

What is the temperature in September in Mountain Island?

The average high-temperature, in September, is 82.2°F (27.9°C), while the average low-temperature is 62.6°F (17°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in September is appraised at 87.6°F (30.9°C).

What is the average humidity in September in Mountain Island?

In September, the average relative humidity is 73%.

How much does it rain in Mountain Island in September?

In Mountain Island, North Carolina, in September, during 13.4 rainfall days, 2.2" (56mm) of precipitation is typically accumulated.

When it does not snow in Mountain Island?

April through October are months without snowfall.

What is the average length of the day in September in Mountain Island?

The average length of the day in September in Mountain Island, North Carolina, is 12.4h.

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

In Mountain Island, the average sunshine in September is 8.6h.

What is the UV index reading in September in Mountain Island?

The average daily maximum UV index in September in Mountain Island, North Carolina, is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to the UV radiation.

Average temperature in September
Mountain Island, NC

Average temperature in September - Mountain Island, NC
  • Average high temperature in September: 82.2°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (47.8°F).

  • Average low temperature in September: 62.6°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (32.5°F).

[Resources]

Average pressure in September
Mountain Island, NC

Average pressure in September - Mountain Island, NC
  • Average pressure in September: 30.04"

The month with the highest atmospheric pressure is November (30.16").
The month with the lowest atmospheric pressure is June (29.98").

[Resources]

Average wind speed in September
Mountain Island, NC

Average wind speed in September - Mountain Island, NC
  • Average wind speed in September: 4.9mph

The windiest month (with the highest average wind speed) is April (7.2mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

[Resources]

Average humidity in September
Mountain Island, NC

Average humidity in September - Mountain Island, NC
  • Average humidity in September: 73%

The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is July (70%).

[Resources]

Average rainfall in September
Mountain Island, NC

Average rainfall in September - Mountain Island, NC
  • Average rainfall in September: 2.2"

The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is October (1.93").

[Resources]

Average rainfall days in September
Mountain Island, NC

Average rainfall days in September - Mountain Island, NC
  • Average rainfall days in September: 13.4 days

The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is November (8.8 days).

[Resources]

Average snowfall in September
Mountain Island, NC

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

The month with the highest snowfall is December (2.01").
Months with the least snowfall are April, May, June, July, August, September and October (0").

[Resources]

Average snowfall days in September
Mountain Island, NC

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

The month with the highest number of snowfall days is February (1.8 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Mountain Island, NC
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 8.6h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is December (Average sunshine: 5.3h).

[Resources]

Average sunshine days in September
Mountain Island, NC

Average sunshine days in September - Mountain Island, NC
  • Average sunshine days in September: 14.9 days

The month with the most sunshine days is October (20.7 days).
The month with the least sunshine days is July (10.6 days).

[Resources]

Average UV index in September
Mountain Island, NC

Average UV index in September - Mountain Island, NC
  • Average UV index in September: 5

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 2).

[Resources]

Average cloud cover in September
Mountain Island, NC

Average cloud cover in September - Mountain Island, NC
  • Average cloud cover in September: 34

The month with the most cloud cover is December (Cloud cover 43).
Months with the least cloud cover are June and July (Cloud cover 30).

[Resources]

Average visibility in September
Mountain Island, NC

Average visibility in September - Mountain Island, NC
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
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