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 August transitions into September, Vermillion sees a gentle drop in the average high-temperature, transitioning from a tropical 89.2°F (31.8°C) to a warm 83.5°F (28.6°C). Throughout September, Vermillion anticipates an average low-temperature of 63.7°F (17.6°C).Heat index
The average heat index in September is evaluated at a tropical 89.6°F (32°C). Persisting in activity during long-term exposure might induce weariness, with subsequent heat cramps.Heat index readings emphasize conditions of light breezes and shaded spots. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
Humidity
In September, the average relative humidity is 72%.Rainfall
September is the month with the least rainfall. Rain falls for 11.9 days and accumulates 1.85" (47mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 23min.On the first day of the month, sunrise is at 7:03 am and sunset at 7:55 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:14 pm EDT.
Sunshine
The average sunshine in September is 8.4h.UV index
In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum UV index of 6 in September translates into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September in Vermillion?
How long on average sun shines in September in Vermillion?
How high is the UV index in September?
Average temperature in September
Vermillion, SC
- Average high temperature in September: 83.5°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 (50.5°F).
- Average low temperature in September: 63.7°F
The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (34.5°F).
Average pressure in September
Vermillion, SC
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Vermillion, SC
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is February (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Vermillion, SC
- Average humidity in September: 72%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Vermillion, SC
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is December (4.09").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in September
Vermillion, SC
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is October (8.8 days).
Average snowfall in September
Vermillion, SC
- Average snowfall in September: 0"
The month with the highest snowfall is December (1.14").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Vermillion, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.3 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
Vermillion, 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: 8h and 2min
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 12min).
Average sunshine days in September
Vermillion, SC
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Vermillion, SC
- Average UV index in September: 6
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Vermillion, SC
- Average cloud cover in September: 33
The month with the most cloud cover is December (Cloud cover 45).
The months with the least cloud cover are June and July (Cloud cover 30).
Average visibility in September
Vermillion, 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).
Vermillion, South Carolina, USA
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