September weather forecastSaint Stephen, SC
September
Weather in September
September, the first month of the autumn in Saint Stephen, is also a moderately hot month, with an average temperature fluctuating between 67.6°F (19.8°C) and 84.6°F (29.2°C).Temperature
Saint Stephen experiences a subtle adjustment in high-temperatures to a warm 84.6°F (29.2°C) with the onset of September, maintaining near parity with August's 89.2°F (31.8°C). In the month of September, Saint Stephen records a consistent average low-temperature of 67.6°F (19.8°C).Heat index
September's heat index is computed to be a sweltering 95°F (35°C). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.Take note of the fact that heat index values are based on shaded circumstances with light airflows. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', marries air temperature and humidity to produce a value illustrating perceived warmth. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.
Humidity
The months with the highest humidity are May, August, September and December, with an average relative humidity of 78%.Rainfall
In Saint Stephen, in September, it is raining for 13.2 days, with typically 1.42" (36mm) of accumulated precipitation. In Saint Stephen, during the entire year, the rain falls for 139.5 days and collects up to 15.75" (400mm) of precipitation.Snowfall
In Saint Stephen, snow does not fall in March through December.Daylight
The average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:54 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:13 am and sunset at 7:05 pm EDT.
Sunshine
In September, the average sunshine is 9h.UV index
In Saint Stephen, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.Note: A typical high UV index of 6 in September suggests the following recommendations:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun 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
Average temperature in September
Saint Stephen, SC
- Average high temperature in September: 84.6°F
The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (55°F).
- Average low temperature in September: 67.6°F
The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (38.3°F).
Average pressure in September
Saint Stephen, 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
Saint Stephen, SC
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Saint Stephen, SC
- Average humidity in September: 78%
The months with the highest relative humidity are May, August, September and December (78%).
The month with the lowest relative humidity is January (73%).
Average rainfall in September
Saint Stephen, SC
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is August (2.87").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in September
Saint Stephen, SC
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is August (20.1 days).
The month with the least rainy days is November (6.4 days).
Average snowfall in September
Saint Stephen, SC
- Average snowfall in September: 0"
The month with the highest snowfall is January (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
Saint Stephen, SC
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Saint Stephen, SC
- Average daylight in September: 12h and 24min
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: 9h and 0min
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 36min).
Average sunshine days in September
Saint Stephen, SC
- Average sunshine days in September: 13.1 days
The month with the most sunshine days is January (22.3 days).
The month with the least sunshine days is August (6.8 days).
Average UV index in September
Saint Stephen, SC
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Saint Stephen, SC
- Average cloud cover in September: 33
The months with the most cloud cover are February and December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 29).
Average visibility in September
Saint Stephen, 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).
