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 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
September's onset records a minor alteration in the average high-temperature to a moderately hot 82.8°F (28.2°C) from August's 87.4°F (30.8°C). During September, Half Moon's temperature averages to a refreshing 67.6°F (19.8°C) at night.Heat index
The heat index value during September is computed to be a tropical 89.6°F (32°C). With prolonged exposure and constant activity, one might feel exhausted and experience heat cramps.Take into consideration that the heat index values are calculated for shade and light wind conditions. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
Humidity
August, September and December, with an average relative humidity of 78%, are the most humid months.Rainfall
In September, the rain falls for 10.8 days. Throughout September, 1.61" (41mm) of precipitation is accumulated. In Half Moon, during the entire year, the rain falls for 125.9 days and collects up to 13.46" (342mm) of precipitation.Snowfall
March through October 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 6:43 am and sunset at 7:35 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:54 pm EDT.
Sunshine
In September, the average sunshine is 9.3h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Guard oneself from overexposure. Defence against sun injury is vital. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What are the most humid months?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Half Moon, NC
- Average high temperature in September: 82.8°F
The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (52°F).
- Average low temperature in September: 67.6°F
The month with the highest average low temperature is July (73.2°F).
The coldest month (with the lowest average low temperature) is January (36.7°F).
Average pressure in September
Half Moon, NC
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January, November and December (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Half Moon, NC
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is April (7.8mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in September
Half Moon, NC
- Average humidity in September: 78%
The months with the highest relative humidity are August, September and December (78%).
The months with the lowest relative humidity are March and April (73%).
Average rainfall in September
Half Moon, NC
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is August (1.89").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Half Moon, NC
- Average rainfall days in September: 10.8 days
The month with the highest number of rainy days is July (15.7 days).
The months with the least rainy days are January and November (6.8 days).
Average snowfall in September
Half Moon, NC
- Average snowfall in September: 0"
The months with the highest snowfall are January, February, November and December (0.04").
The months with the least snowfall are March, April, May, June, July, August, September and October (0").
Average snowfall days in September
Half Moon, NC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.5 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Half Moon, 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 54min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).
Average sunshine days in September
Half Moon, NC
- Average sunshine days in September: 16.7 days
The month with the most sunshine days is January (22.8 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in September
Half Moon, NC
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).
Average cloud cover in September
Half Moon, NC
- Average cloud cover in September: 34
The months with the most cloud cover are February, March and December (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Half Moon, 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).
Half Moon, North Carolina, USA
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