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
September's arrival comes with a mild decrease in the average high-temperature, moving subtly from a tropical 89.1°F (31.7°C) in August to a warm 82.9°F (28.3°C). Smyrna records an average temperature drop to an enjoyable 62.4°F (16.9°C) in September.Heat index
The heat index in September is evaluated at a hot 89.6°F (32°C). Uninterrupted exposure and activity might result in fatigue, potentially causing heat cramps.Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is achieved by amalgamating air temperature with the relative humidity readings. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
Humidity
In September, the average relative humidity is 73%.Rainfall
In September, the rain falls for 12 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. Throughout the year, there are 150.1 rainfall days, and 27.68" (703mm) of precipitation is accumulated.Snowfall
April through November are months without snowfall in Smyrna.Daylight
In September, the average length of the day is 12h and 23min.On the first day of the month, sunrise is at 6:58 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:10 pm EDT.
Sunshine
In September, the average sunshine is 8.4h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 5 translates into these guidelines:
Adopt protective measures - It is advised to guard against sun damage. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September in Smyrna?
Average temperature in September
Smyrna, SC
- Average high temperature in September: 82.9°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (48.7°F).
- Average low temperature in September: 62.4°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (32.7°F).
Average pressure in September
Smyrna, SC
- Average pressure in September: 30.04"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
Smyrna, SC
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in September
Smyrna, SC
- Average humidity in September: 73%
The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Smyrna, SC
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is August (3.11").
The driest month (with the least rainfall) is October (1.73").
Average rainfall days in September
Smyrna, SC
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in September
Smyrna, SC
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.01").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Smyrna, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.8 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
Smyrna, SC
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in September
Smyrna, SC
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is October (20.9 days).
The month with the least sunshine days is July (11.2 days).
Average UV index in September
Smyrna, SC
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Smyrna, SC
- Average cloud cover in September: 34
The month with the most cloud cover is December (Cloud cover 43).
The months with the least cloud cover are June and July (Cloud cover 30).
Average visibility in September
Smyrna, 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).
Smyrna, South Carolina, USA
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