September weather forecastMarion, SC
September
Weather in September
The first month of the autumn, September, is still a warm month in Marion, South Carolina, with an average temperature fluctuating between 66.2°F (19°C) and 83.3°F (28.5°C).Temperature
As Marion steps into September, the average high-temperature holds at a warm 83.3°F (28.5°C), hinting at a minor fluctuation from the prior month. The average temperature during September nights dips to a comfortable 66.2°F (19°C).Heat index
The heat index value during September is calculated to be a hot 91.4°F (33°C). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.Heat index details are generally centered around shaded locations and a mild breeze. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'feels like' or 'felt air temperature', quantifies the warmth felt when relative humidity is considered. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Humidity
May, August and September, with an average relative humidity of 78%, are the most humid months.Rainfall
In Marion, in September, it is raining for 15.5 days, with typically 3.15" (80mm) of accumulated precipitation. Throughout the year, there are 171 rainfall days, and 34.29" (871mm) of precipitation is accumulated.Snowfall
In Marion, snow does not fall in April through November.Daylight
The average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:51 am and sunset at 7:43 pm. On the last day of September, sunrise is at 7:11 am and sunset at 7:02 pm EDT.
Sunshine
In Marion, the average sunshine in September is 9.3h.UV index
In Marion, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 6 translates into these guidelines:
Shield from overexposure. Defense against sun-related harm is required. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Marion, SC
- Average high temperature in September: 83.3°F
The warmest month (with the highest average high temperature) is July (89.4°F).
The month with the lowest average high temperature is January (52.3°F).
- Average low temperature in September: 66.2°F
The month with the highest average low temperature is July (72.3°F).
The coldest month (with the lowest average low temperature) is January (36.9°F).
Average pressure in September
Marion, SC
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January and November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Marion, SC
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is April (8mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Marion, SC
- Average humidity in September: 78%
The months with the highest relative humidity are May, August and September (78%).
The months with the lowest relative humidity are January and November (73%).
Average rainfall in September
Marion, SC
- Average rainfall in September: 3.15"
The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (1.54").
Average rainfall days in September
Marion, SC
- Average rainfall days in September: 15.5 days
The month with the highest number of rainy days is July (21.1 days).
The month with the least rainy days is October (8.7 days).
Average snowfall in September
Marion, SC
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.63").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Marion, SC
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.7 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
Marion, SC
- Average daylight in September: 12h and 24min
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 18min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in September
Marion, SC
- Average sunshine days in September: 12.7 days
The month with the most sunshine days is October (20.2 days).
The month with the least sunshine days is July (8 days).
Average UV index in September
Marion, 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
Marion, SC
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is October (Cloud cover 29).
Average visibility in September
Marion, 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).
