September weather forecast
Wilsonville, SC

Share

Weather in September

The first month of the autumn, September, is still a warm month in Wilsonville, South Carolina, with an average temperature fluctuating between 85.1°F (29.5°C) and 70.9°F (21.6°C).

Temperature

The average high-temperature for September is a warm 85.1°F (29.5°C), closely aligning with the temperature of the preceding month. September nights observe an average temperature dip to a pleasant 70.9°F (21.6°C).

Heat index

During September, the heat index is evaluated at a fiery hot 95°F (35°C). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
Heat index determinations are made taking into account the shade and light air movements. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', gauges the sensation of temperature factoring in the air's moisture content. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.

Humidity

The average relative humidity in September is 75%.

Rainfall

In Wilsonville, in September, it is raining for 16.5 days, with typically 4.02" (102mm) of accumulated precipitation. Throughout the year, there are 172.6 rainfall days, and 39.13" (994mm) of precipitation is accumulated.

Snowfall

March through November are months without snowfall.

Daylight

The average length of the day in September 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 7:14 am and sunset at 7:05 pm EDT.

Sunshine

The average sunshine in September is 8.9h.

UV index

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A typical high UV index of 6 in September suggests the following recommendations:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.

Frequently asked questions

Is it hot during September?

The average high-temperature and low-temperature during September are 85.1°F (29.5°C) and 70.9°F (21.6°C) respectively. In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines air temperature and relative humidity, is evaluated at 95°F (35°C).

What is the average humidity in September in Wilsonville?

In September, the average relative humidity is 75%.

How many days does it rain in September?

In Wilsonville, in September, it is raining for 16.5 days, with typically 4.02" (102mm) of accumulated precipitation.

When it does not snow?

March through November are months without snowfall in Wilsonville.

What is the average length of the day in September?

In Wilsonville, the average day length in September is 12h and 22min.

What time are sunrise and sunset in September in Wilsonville?

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 7:14 am and sunset at 7:05 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.9h.

What is the UV index reading in September?

In Wilsonville, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Wilsonville, SC

Average temperature in September - Wilsonville, SC
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (56.8°F).

  • Average low temperature in September: 70.9°F

The month with the highest average low temperature is July (75.7°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).

Average pressure in September
Wilsonville, SC

Average pressure in September - Wilsonville, SC
  • Average pressure in September: 30"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.98"Hg).

Average wind speed in September
Wilsonville, SC

Average wind speed in September - Wilsonville, SC
  • Average wind speed in September: 6.5mph

The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

Average humidity in September
Wilsonville, SC

Average humidity in September - Wilsonville, SC
  • Average humidity in September: 75%

The month with the highest relative humidity is December (77%).
The months with the lowest relative humidity are January and March (72%).

Average rainfall in September
Wilsonville, SC

Average rainfall in September - Wilsonville, SC
  • Average rainfall in September: 4.02"

The wettest month (with the highest rainfall) is August (6.22").
The driest month (with the least rainfall) is January (1.46").

Average rainfall days in September
Wilsonville, SC

Average rainfall days in September - Wilsonville, SC
  • Average rainfall days in September: 16.5 days

The month with the highest number of rainy days is August (23.4 days).
The month with the least rainy days is November (8.2 days).

Average snowfall in September
Wilsonville, SC

Average snowfall in September - Wilsonville, SC
  • Average snowfall in September: 0"

The month with the highest snowfall is February (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
Wilsonville, SC

Average snowfall days in September - Wilsonville, 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 and November (0 days).

Average daylight in September /
Average sunshine in September
Wilsonville, SC

Average daylight in September / Average sunshine in September - Wilsonville, 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 5min

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 36min).

Average sunshine days in September
Wilsonville, SC

Average sunshine days in September - Wilsonville, SC
  • Average sunshine days in September: 11.6 days

The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is August (5.8 days).

Average UV index in September
Wilsonville, SC

Average UV index in September - Wilsonville, SC
  • Average UV index in September: 6

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).

Average cloud cover in September
Wilsonville, SC

Average cloud cover in September - Wilsonville, SC
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 41).
The months with the least cloud cover are June and July (Cloud cover 27).

Average visibility in September
Wilsonville, SC

Average visibility in September - Wilsonville, 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).

Wilsonville, South Carolina, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location