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 onset introduces a mild reduction in the average high-temperature, from a hot 90.5°F (32.5°C) in August to a moderately hot 85.1°F (29.5°C). Warrenville's average low-temperature during September nights is observed to be an enjoyable 67.3°F (19.6°C).Heat index
The heat index in September is calculated to be a tropical 93.2°F (34°C). Use additional protective measures, heat cramps and heat exhaustion are possible outcomes. Continuous activity might lead to heatstroke.Metrics for the heat index primarily focus on shaded spots and light wind conditions. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
Humidity
In September, the average relative humidity is 71%.Rainfall
September is the month with the least rainfall. Rain falls for 11.7 days and accumulates 1.5" (38mm) of precipitation.Snowfall
March through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September, sunrise is at 7:01 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:12 pm EDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 6 during September leads to these advisories:
Resist overexposure. Safeguarding from solar damage is indispensable. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely.
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 many days does it rain in September in Warrenville?
When it does not snow?
How many hours of daylight does Warrenville have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Warrenville, SC
- Average high temperature in September: 85.1°F
The warmest month (with the highest average high temperature) is July (91.8°F).
The month with the lowest average high temperature is January (53.8°F).
- Average low temperature in September: 67.3°F
The month with the highest average low temperature is July (73.4°F).
The coldest month (with the lowest average low temperature) is January (37.9°F).
Average pressure in September
Warrenville, SC
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Warrenville, SC
- Average wind speed in September: 6.2mph
The windiest months (with the highest average wind speed) are February, March and April (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Warrenville, SC
- Average humidity in September: 71%
The month with the highest relative humidity is December (75%).
The months with the lowest relative humidity are July and November (69%).
Average rainfall in September
Warrenville, SC
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is December (2.99").
The driest month (with the least rainfall) is September (1.5").
Average rainfall days in September
Warrenville, SC
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is November (7.8 days).
Average snowfall in September
Warrenville, SC
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.28").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Warrenville, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.5 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
Warrenville, SC
- Average daylight in September: 12h and 2min
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: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Warrenville, SC
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is October (21.3 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in September
Warrenville, SC
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Warrenville, SC
- Average cloud cover in September: 30
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 27).
Average visibility in September
Warrenville, 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).
Warrenville, South Carolina, USA
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