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
The introduction of September notes a subtle temperature variation to a warm 85.1°F (29.5°C) from August's 90.1°F (32.3°C). September in Harleyville generally records an average low-temperature of 67.6°F (19.8°C).Heat index
The heat index in September is calculated to be a fiery hot 95°F (35°C). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.Evaluating the heat index requires understanding its values in the shade and with gentle winds. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', represents the fusion of temperature and moisture in the air to suggest how warm it feels. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.
Humidity
May, August, September and December, with an average relative humidity of 77%, are the most humid months.Rainfall
In September, the rain falls for 13.5 days. Throughout September, 2.05" (52mm) of precipitation is accumulated. In Harleyville, South Carolina, during the entire year, the rain falls for 151.2 days and collects up to 23.46" (596mm) of precipitation.Snowfall
March through December are months without snowfall.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September, sunrise is at 6:56 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:07 pm EDT.
Sunshine
In September, the average sunshine is 8.7h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 6 during September translates into the following recommendations:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Harleyville in September?
What are the most humid months in Harleyville?
What is the average humidity in September in Harleyville?
How many days does it rain in September in Harleyville?
When it does not snow in Harleyville?
What is the average length of the day in September in Harleyville?
When are sunrise and sunset in September in Harleyville?
How many hours of sunshine does Harleyville have in September?
How high is the UV index in September in Harleyville?
Average temperature in September
Harleyville, SC
- Average high temperature in September: 85.1°F
The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is January (55.2°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 (38.8°F).
Average pressure in September
Harleyville, SC
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Harleyville, SC
- Average wind speed in September: 5.6mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Harleyville, SC
- Average humidity in September: 77%
The months with the highest relative humidity are May, August, September and December (77%).
The month with the lowest relative humidity is January (72%).
Average rainfall in September
Harleyville, SC
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is August (3.15").
The driest month (with the least rainfall) is November (0.91").
Average rainfall days in September
Harleyville, SC
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is August (19.5 days).
The month with the least rainy days is November (6.8 days).
Average snowfall in September
Harleyville, SC
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (0.16").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Harleyville, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.4 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
Harleyville, SC
- Average daylight in September: 12h and 2min
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 4min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Harleyville, SC
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is August (8.7 days).
Average UV index in September
Harleyville, 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
Harleyville, SC
- Average cloud cover in September: 33
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 29).
Average visibility in September
Harleyville, SC
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Harleyville, South Carolina, USA
Weather forecast for your location
2. Allow the app to use your location