September weather forecast
Mount Holly, NC

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Weather in September

September, the first month of the autumn in Mount Holly, is also a moderately hot month, with an average temperature fluctuating between 82.9°F (28.3°C) and 63.5°F (17.5°C).

Temperature

In September, the meteorological conditions change slightly, with the average high-temperature moving from a tropical 88.5°F (31.4°C) in August to a warm 82.9°F (28.3°C). In Mount Holly, the average low-temperature during the month of September is a comfortable 63.5°F (17.5°C).

Heat index

The heat index for September is estimated at a hot 89.6°F (32°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
The metrics for the heat index are tailored for both shady environments and light winds. 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 'felt air temperature' or 'apparent temperature', reflects the feeling of heat when considering both air temperature and humidity. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values hold particular significance for children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.

Humidity

The average relative humidity in September is 73%.

Rainfall

In Mount Holly, North Carolina, in September, it is raining for 12.6 days, with typically 2.09" (53mm) of accumulated precipitation. In Mount Holly, during the entire year, the rain falls for 155.8 days and collects up to 30.98" (787mm) of precipitation.

Snowfall

April through November are months without snowfall.

Daylight

In September, the average length of the day is 12h and 23min.
On the first day of the month, sunrise is at 6:57 am and sunset at 7:50 pm. On the last day of September, in Mount Holly, sunrise is at 7:18 am and sunset at 7:08 pm EDT.

Sunshine

In September, the average sunshine is 8.7h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 5 during September leads to these instructions:
Heed the precautions - Suggestions to avoid sunburn are made. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.

Frequently asked questions

How hot is it in September?

In September, the average high-temperature and low-temperature are 82.9°F (28.3°C) and 63.5°F (17.5°C) respectively. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in September is estimated at 89.6°F (32°C).

What is the average humidity in September?

The average relative humidity in September is 73%.

How many days does it rain in September?

In Mount Holly, in September, it is raining for 12.6 days, with typically 2.09" (53mm) of accumulated precipitation.

When it does not snow?

In Mount Holly, North Carolina, snow does not fall in April through November.

What is the average length of the day in September?

The average day length in September is 12h and 23min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:57 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:08 pm EDT.

How many hours of sunshine does Mount Holly have in September?

In Mount Holly, the average sunshine duration in September is 8.7h.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Mount Holly, NC

Average temperature in September - Mount Holly, NC
  • Average high temperature in September: 82.9°F

The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (48.7°F).

  • Average low temperature in September: 63.5°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 (33.1°F).

Average pressure in September
Mount Holly, NC

Average pressure in September - Mount Holly, NC
  • Average pressure in September: 30.04"Hg

The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

Average wind speed in September
Mount Holly, NC

Average wind speed in September - Mount Holly, NC
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).

Average humidity in September
Mount Holly, NC

Average humidity in September - Mount Holly, NC
  • Average humidity in September: 73%

The months with the highest relative humidity are May and December (75%).
The months with the lowest relative humidity are June and July (70%).

Average rainfall in September
Mount Holly, NC

Average rainfall in September - Mount Holly, NC
  • Average rainfall in September: 2.09"

The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is October (1.97").

Average rainfall days in September
Mount Holly, NC

Average rainfall days in September - Mount Holly, NC
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is November (8.7 days).

Average snowfall in September
Mount Holly, NC

Average snowfall in September - Mount Holly, NC
  • Average snowfall in September: 0"

The month with the highest snowfall is December (1.97").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in September
Mount Holly, NC

Average snowfall days in September - Mount Holly, NC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.6 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

Average daylight in September /
Average sunshine in September
Mount Holly, NC

Average daylight in September / Average sunshine in September - Mount Holly, NC
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

Average sunshine days in September
Mount Holly, NC

Average sunshine days in September - Mount Holly, NC
  • Average sunshine days in September: 16.1 days

The month with the most sunshine days is October (20.7 days).
The month with the least sunshine days is July (11 days).

Average UV index in September
Mount Holly, NC

Average UV index in September - Mount Holly, NC
  • 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
Mount Holly, NC

Average cloud cover in September - Mount Holly, NC
  • Average cloud cover in September: 33

The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is June (Cloud cover 29).

Average visibility in September
Mount Holly, NC

Average visibility in September - Mount Holly, 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).

Mount Holly, North Carolina, USA

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