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
As September takes hold, the average high-temperature is a warm 83.3°F (28.5°C), nearly mirroring that of the previous month. Throughout the nights in September, an average low-temperature of 66.2°F (19°C) is noted.Heat index
For September, the heat index is estimated at a tropical 91.4°F (33°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
Humidity
The months with the highest humidity are May and September, with an average relative humidity of 76%.Rainfall
In Hartsville, in September, during 13.1 rainfall days, 2.64" (67mm) of precipitation is typically accumulated. Throughout the year, there are 154 rainfall days, and 30.51" (775mm) of precipitation is accumulated.Snowfall
In Hartsville, snow does not fall in April through October.Daylight
In September, the average length of the day is 12h and 23min.On the first day of September, sunrise is at 6:54 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:05 pm EDT.
Sunshine
The average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The daily maximum UV index of 6 in September interprets into the following advice:
Shield from overexposure. Defense against sun-related harm is required. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in 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?
How many hours of daylight does Hartsville have in September?
What time are sunrise and sunset in September in Hartsville?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Hartsville, SC
- Average high temperature in September: 83.3°F
The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (51.8°F).
- Average low temperature in September: 66.2°F
The month with the highest average low temperature is July (72.5°F).
The coldest month (with the lowest average low temperature) is January (36.9°F).
Average pressure in September
Hartsville, 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 (29.97"Hg).
Average wind speed in September
Hartsville, SC
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Hartsville, SC
- Average humidity in September: 76%
The months with the highest relative humidity are May and September (76%).
The months with the lowest relative humidity are January and November (71%).
Average rainfall in September
Hartsville, SC
- Average rainfall in September: 2.64"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is January (1.81").
Average rainfall days in September
Hartsville, SC
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is October (7.8 days).
Average snowfall in September
Hartsville, SC
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.94").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Hartsville, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.7 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
Hartsville, SC
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).
Average sunshine days in September
Hartsville, SC
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is October (21.9 days).
The month with the least sunshine days is July (11 days).
Average UV index in September
Hartsville, SC
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Hartsville, SC
- Average cloud cover in September: 32
The months with the most cloud cover are February and December (Cloud cover 41).
The months with the least cloud cover are June and October (Cloud cover 29).
Average visibility in September
Hartsville, 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).
Hartsville, South Carolina, USA
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