September weather forecastBonneau, SC
September
Weather in September
The first month of the autumn, September, is still a warm month in Bonneau, South Carolina, with an average temperature varying between 67.6°F (19.8°C) and 84.6°F (29.2°C).Temperature
Bonneau, South Carolina, experiences an average high-temperature of a moderately hot 84.6°F (29.2°C) with the onset of September, subtly varied from August's 89.2°F (31.8°C). Bonneau cools down to an average low-temperature of 67.6°F (19.8°C) throughout the month of September.Heat index
Throughout September, the heat index is estimated at a sweltering 95°F (35°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.When assessing, remember that heat index measurements are for light winds and shaded spots. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', represents the fusion of temperature and moisture in the air to suggest how warm it feels. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. Overheating and potential dehydration arise when body heat gain eclipses its release capability.
Humidity
May, August, September and December, with an average relative humidity of 78%, are the most humid months in Bonneau.Rainfall
In Bonneau, in September, it is raining for 13.2 days, with typically 1.42" (36mm) of accumulated precipitation. Throughout the year, in Bonneau, there are 139.5 rainfall days, and 15.75" (400mm) of precipitation is accumulated.Snowfall
In Bonneau, snow does not fall in March through December.Daylight
The average length of the day in September in Bonneau 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, in Bonneau, sunrise is at 7:13 am and sunset at 7:05 pm EDT.
Sunshine
The average sunshine in September in Bonneau is 9h.UV index
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 average individuals.Note: During September, 6 as the daily maximum UV index converts into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bonneau, 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
Bonneau, 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
Bonneau, 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
Bonneau, 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
Bonneau, 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
Bonneau, 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
Bonneau, 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
Bonneau, 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
Bonneau, 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
Bonneau, 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
Bonneau, 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
Bonneau, 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
Bonneau, 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).
