September weather forecastHenderson, NC
September
Weather in September
September, the first month of the autumn in Henderson, is also a moderately hot month, with temperature in the range of an average low of 63.1°F (17.3°C) and an average high of 81.7°F (27.6°C).Temperature
September signals a slight drop in average high-temperature, sliding from August's hot 87.4°F (30.8°C) to a moderately hot 81.7°F (27.6°C). September's nights observe an average temperature of 63.1°F (17.3°C).Heat index
For September, the heat index is calculated to be a hot 87.8°F (31°C). If one endures exposure and continues to be active, it might result in tiredness and heat cramps.Always consider that heat index estimations are for light winds and places in the shade. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', combines both the air temperature and the humidity level to give a perceived human temperature. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. 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 relevant to children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
Humidity
In September, the average relative humidity is 76%.Rainfall
The month with the least rainfall is September, when the rain falls for 13.2 days and typically collects 2.09" (53mm) of precipitation.Snowfall
In Henderson, snow does not fall in April through October.Daylight
In Henderson, North Carolina, the average length of the day in September is 12h and 24min.On the first day of September, sunrise is at 6:45 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:58 pm EDT.
Sunshine
In Henderson, North Carolina, the average sunshine in September is 8.9h.UV index
In Henderson, 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 the average person.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Take necessary precautions - Protection from skin and eye injury is mandatory. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Henderson, NC
- Average high temperature in September: 81.7°F
The warmest month (with the highest average high temperature) is July (89.8°F).
The month with the lowest average high temperature is January (46.8°F).
- Average low temperature in September: 63.1°F
The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (31.1°F).
Average pressure in September
Henderson, NC
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Henderson, NC
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Henderson, NC
- Average humidity in September: 76%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Henderson, NC
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is August (2.87").
The driest month (with the least rainfall) is September (2.09").
Average rainfall days in September
Henderson, NC
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is November (9.2 days).
Average snowfall in September
Henderson, NC
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.85").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Henderson, NC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.9 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
Henderson, NC
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 8h and 54min
The months with the most sunshine are June and July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Henderson, NC
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (20.1 days).
The months with the least sunshine days are May and July (12.1 days).
Average UV index in September
Henderson, NC
- Average UV index in September: 5
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Henderson, NC
- Average cloud cover in September: 38
The months with the most cloud cover are February and March (Cloud cover 43).
The months with the least cloud cover are June and July (Cloud cover 31).
Average visibility in September
Henderson, 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).
