September weather forecastGraniteville, SC
September
Weather in September
September, the first month of the autumn in Graniteville, is still a warm month, with an average temperature ranging between max 85.1°F (29.5°C) and min 67.3°F (19.6°C).Temperature
The onset of September is marked by a minor decrease in temperature, transitioning from a tropical 90.5°F (32.5°C) in August to a warm 85.1°F (29.5°C). During the month of September, the nighttime temperature in Graniteville falls to an average of 67.3°F (19.6°C).Heat index
September's average heat index is estimated at a tropical 93.2°F (34°C). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.Heat index guidelines indicate values are for light wind scenarios and shaded regions. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a metric representing the sensation of warmth when air temperature and moisture come together. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely vital to babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
Humidity
The average relative humidity in September is 71%.Rainfall
September is the month with the least rainfall in Graniteville. Rain falls for 11.7 days and accumulates 1.5" (38mm) of precipitation.Snowfall
March through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 7:01 am and sunset at 7:52 pm. On the last day of September, sunrise is at 7:21 am and sunset at 7:12 pm EDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In Graniteville, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index, 6 in September, converts into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Graniteville, SC
- Average high temperature in September: 85.1°F
The warmest month (with the highest average high temperature) is July (91.8°F).
The month with the lowest average high temperature is January (53.8°F).
- Average low temperature in September: 67.3°F
The month with the highest average low temperature is July (73.4°F).
The coldest month (with the lowest average low temperature) is January (37.9°F).
Average pressure in September
Graniteville, SC
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Graniteville, SC
- Average wind speed in September: 6.2mph
The windiest months (with the highest average wind speed) are February, March and April (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Graniteville, SC
- Average humidity in September: 71%
The month with the highest relative humidity is December (75%).
The months with the lowest relative humidity are July and November (69%).
Average rainfall in September
Graniteville, SC
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is December (2.99").
The driest month (with the least rainfall) is September (1.5").
Average rainfall days in September
Graniteville, SC
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is November (7.8 days).
Average snowfall in September
Graniteville, SC
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.28").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Graniteville, SC
- 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, October and November (0 days).
Average daylight in September /
Average sunshine in September
Graniteville, SC
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 8h and 36min
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 24min).
Average sunshine days in September
Graniteville, SC
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is October (21.3 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in September
Graniteville, SC
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Graniteville, SC
- Average cloud cover in September: 30
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 27).
Average visibility in September
Graniteville, SC
- 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).
