September weather forecastJacksonville, NC
September
Weather in September
September rings in the start of the fall season with a significant drop in high temperatures from August, bringing a welcome relief from summer's peak. The rainfall measures decrease to 2.87" (73mm) from previous highs, indicating drier conditions. As daylight hours start to wane, September merges warm afternoons with cooler nights, typical of the region's autumn weather. Although the month experiences a slight decrease in humidity, the levels remain quite high. In summary, September in Jacksonville is a transition period between summer and fall with an easing of temperatures and humidity.Temperature
As Jacksonville welcomes September, the average high-temperature records at a moderately hot 82.8°F (28.2°C), marking an insignificant deviation from the prior month. During September in Jacksonville, the average low-temperature is recorded at a pleasant 68.7°F (20.4°C).Heat index
For most parts of September, the heat index is computed to be a tropical 89.6°F (32°C). If one sustains activity during exposure, it could lead to a sense of fatigue, with a chance of heat cramps.Take note of the fact that heat index values are based on shaded circumstances with light airflows. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', is a numerical representation of warmth when taking temperature and moisture levels into account. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Humidity
The months with the highest humidity are August, September and December, with an average relative humidity of 77%.Rainfall
In Jacksonville, in September, it is raining for 14.1 days, with typically 2.87" (73mm) of accumulated precipitation. In Jacksonville, North Carolina, during the entire year, the rain falls for 158.7 days and collects up to 23.39" (594mm) of precipitation.Snowfall
In Jacksonville, snow does not fall in March through December.Daylight
In Jacksonville, the average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:43 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:54 pm EDT.
Sunshine
The average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September in Jacksonville is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 6 during September leads to these advisories:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Jacksonville, NC
- Average high temperature in September: 82.8°F
The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is January (52.9°F).
- Average low temperature in September: 68.7°F
The month with the highest average low temperature is July (73.9°F).
The coldest month (with the lowest average low temperature) is January (37.9°F).
Average pressure in September
Jacksonville, NC
- Average pressure in September: 30.01"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).
Average wind speed in September
Jacksonville, NC
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is April (8.2mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in September
Jacksonville, NC
- Average humidity in September: 77%
The months with the highest relative humidity are August, September and December (77%).
The months with the lowest relative humidity are January, February, March and April (73%).
Average rainfall in September
Jacksonville, NC
- Average rainfall in September: 2.87"
The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in September
Jacksonville, NC
- Average rainfall days in September: 14.1 days
The month with the highest number of rainy days is August (21 days).
The month with the least rainy days is November (9.2 days).
Average snowfall in September
Jacksonville, NC
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.35").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Jacksonville, NC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.8 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
Jacksonville, NC
- Average daylight in September: 12h and 24min
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 24min
The months with the most sunshine are June and July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in September
Jacksonville, NC
- Average sunshine days in September: 12.8 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is August (6.7 days).
Average UV index in September
Jacksonville, 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, November and December (UV index 3).
Average cloud cover in September
Jacksonville, NC
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 41).
The months with the least cloud cover are June and July (Cloud cover 28).
Average visibility in September
Jacksonville, 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).
