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
The arrival of September coincides with an average high-temperature of a moderately hot 83.1°F (28.4°C), indicating a minimal shift from August's 88.3°F (31.3°C). The month of September records an average low-temperature of 65.3°F (18.5°C).Heat index
The heat index value for September is evaluated at a hot 89.6°F (32°C). If one stays active during extended exposure, it might induce fatigue and result in heat cramps.Heat index data is primarily for areas with shade and subjected to light winds. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', determines the feeling of heat when you account for the relative humidity. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
Humidity
The months with the highest humidity are May, September and December, with an average relative humidity of 75%.Rainfall
In Chesterfield, South Carolina, in September, during 12.7 rainfall days, 2.52" (64mm) of precipitation is typically accumulated. In Chesterfield, South Carolina, during the entire year, the rain falls for 149.5 days and collects up to 28.23" (717mm) of precipitation.Snowfall
In Chesterfield, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:53 am and sunset at 7:46 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:05 pm EDT.
Sunshine
In Chesterfield, South Carolina, the average sunshine in September is 9.2h.UV index
In Chesterfield, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Guard oneself from overexposure. Defence against sun injury is vital. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What are the most humid months?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Chesterfield have in September?
What time are sunrise and sunset in September in Chesterfield?
How many hours of sunshine does Chesterfield have in September?
What is the UV index reading in September?
Average temperature in September
Chesterfield, SC
- Average high temperature in September: 83.1°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 (50.5°F).
- Average low temperature in September: 65.3°F
The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is January (35.6°F).
Average pressure in September
Chesterfield, SC
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Chesterfield, SC
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is April (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Chesterfield, SC
- Average humidity in September: 75%
The months with the highest relative humidity are May, September and December (75%).
The months with the lowest relative humidity are January, July and November (71%).
Average rainfall in September
Chesterfield, SC
- Average rainfall in September: 2.52"
The wettest month (with the highest rainfall) is August (2.91").
The driest months (with the least rainfall) are January and October (1.77").
Average rainfall days in September
Chesterfield, SC
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is October (8.2 days).
Average snowfall in September
Chesterfield, SC
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.98").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Chesterfield, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.8 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
Chesterfield, 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: 9h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Chesterfield, SC
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is October (21.9 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Chesterfield, 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
Chesterfield, SC
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in September
Chesterfield, 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).
Chesterfield, South Carolina, USA
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