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
Transitioning into September, South Windermire records an average high-temperature of a warm 83.5°F (28.6°C), almost identical to August's 87.4°F (30.8°C). September nights experience a consistent temperature drop to an agreeable 73°F (22.8°C).Heat index
In September, the heat index is evaluated at a tropical 91.4°F (33°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.Metrics for the heat index primarily focus on shaded spots and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is the result of factoring in humidity to the air temperature, indicating perceived warmth. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. 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 are particularly meaningful for babies and toddlers. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
Humidity
The average relative humidity in September is 75%.Rainfall
In South Windermire, in September, during 18.4 rainfall days, 5" (127mm) of precipitation is typically accumulated. In South Windermire, South Carolina, during the entire year, the rain falls for 178.9 days and collects up to 41.93" (1065mm) of precipitation.Snowfall
February 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 6:55 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:05 pm EDT.
Sunshine
The average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for average individuals.Note: A daily maximum UV index of 6 in September translates into the following instructions:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Opt for tightly woven and loose clothing to enhance protection from the Sun.
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?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
South Windermire, SC
- Average high temperature in September: 83.5°F
The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (57°F).
- Average low temperature in September: 73°F
The month with the highest average low temperature is July (77.4°F).
The coldest month (with the lowest average low temperature) is January (44.4°F).
Average pressure in September
South Windermire, 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 (29.98"Hg).
Average wind speed in September
South Windermire, SC
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).
Average humidity in September
South Windermire, SC
- Average humidity in September: 75%
The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are January and March (73%).
Average rainfall in September
South Windermire, SC
- Average rainfall in September: 5"
The wettest month (with the highest rainfall) is August (7.13").
The driest month (with the least rainfall) is January (1.42").
Average rainfall days in September
South Windermire, SC
- Average rainfall days in September: 18.4 days
The month with the highest number of rainy days is August (24.8 days).
The month with the least rainy days is November (8.7 days).
Average snowfall in September
South Windermire, SC
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
South Windermire, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
South Windermire, 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: 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 42min).
Average sunshine days in September
South Windermire, SC
- Average sunshine days in September: 8.5 days
The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is August (3.8 days).
Average UV index in September
South Windermire, SC
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).
Average cloud cover in September
South Windermire, SC
- Average cloud cover in September: 29
The months with the most cloud cover are February and December (Cloud cover 39).
The months with the least cloud cover are June and July (Cloud cover 26).
Average visibility in September
South Windermire, 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).
South Windermire, South Carolina, USA
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