September weather forecast
Fort Mill, SC

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Weather in September

September brings perceptible weather mititgation to Fort Mill, serving as a gateway to fall conditions. Though the sun still shines admirably for approximately 8.6 hours a day, it makes way for slightly cooler temperatures and rainfall. Paling in comparison to the summer storms, September experiences the year’s minimum rainfall, amounting to just 1.81" (46mm). As leaf colors start to undergo a visual shift, gusty conditions are mostly absent with wind gusts averaging a mild 8.7mph (14km/h). It is definitely a favorable time to be outdoors, given the balanced weather conditions.

Temperature

A mild drop in Fort Mill's average high-temperature is observed in September, transitioning from a tropical 88.7°F (31.5°C) in August to a warm 83.3°F (28.5°C). Fort Mill's September nights cool down to an average low-temperature of 64.2°F (17.9°C).

Heat index

The heat index for September is appraised at a tropical 89.6°F (32°C). Remaining active during long-lasting exposure could cause fatigue, leading to heat cramps.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'real feel' or 'feels like', offers an insight into how hot it feels when we factor in moisture content. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.

Humidity

The average relative humidity in September is 72%.

Rainfall

The months with the least rainfall are September and October Rain falls for 11.5 days and accumulates 1.81" (46mm) of rain.

Snowfall

In Fort Mill, South Carolina, snow does not fall in April through November.

Daylight

In September, the average length of the day is 12h and 23min.
On the first day of September, sunrise is at 6:57 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:08 pm EDT.

Sunshine

The average sunshine in September in Fort Mill is 8.6h.

UV index

In September, the average daily maximum UV index in Fort Mill is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 5 during September leads to these instructions:
Take necessary precautions - Protection from skin and eye injury is mandatory. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
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Frequently asked questions

How hot is September in Fort Mill?

The average high-temperature and low-temperature in Fort Mill during September are 83.3°F (28.5°C) and 64.2°F (17.9°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in September is appraised at 89.6°F (32°C).

What is the average humidity in September in Fort Mill?

In September, the average relative humidity in Fort Mill is 72%.

What is the driest month in Fort Mill?

The months with the least rainfall are September and October Rain falls for 11.5 days and accumulates 1.81" (46mm) of rain.

How many days does it rain in September in Fort Mill?

In Fort Mill, in September, it is raining for 11.5 days, with typically 1.81" (46mm) of accumulated precipitation.

When it does not snow in Fort Mill?

April through November are months without snowfall in Fort Mill.

What is the average length of the day in September in Fort Mill?

In September, the average day length in Fort Mill, South Carolina, is 12h and 23min.

What time are sunrise and sunset in September in Fort Mill?

On the first day of September in Fort Mill, sunrise is at 6:57 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:08 pm EDT.

How many hours of sunshine does Fort Mill have in September?

In September, the average sunshine duration is 8.6h.

What is the UV index reading in September in Fort Mill?

In Fort Mill, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe 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
Fort Mill, SC

Average temperature in September - Fort Mill, SC
  • Average high temperature in September: 83.3°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (49.6°F).

  • Average low temperature in September: 64.2°F

The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (34.3°F).

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Average pressure in September
Fort Mill, SC

Average pressure in September - Fort Mill, SC
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

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Average wind speed in September
Fort Mill, SC

Average wind speed in September - Fort Mill, SC
  • Average wind speed in September: 5.4mph

The windiest months (with the highest average wind speed) are February and April (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

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Average humidity in September
Fort Mill, SC

Average humidity in September - Fort Mill, SC
  • Average humidity in September: 72%

The month with the highest relative humidity is December (75%).
The month with the lowest relative humidity is July (69%).

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Average rainfall in September
Fort Mill, SC

Average rainfall in September - Fort Mill, SC
  • Average rainfall in September: 1.81"

The wettest month (with the highest rainfall) is August (3.23").
The driest months (with the least rainfall) are September and October (1.81").

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Average rainfall days in September
Fort Mill, SC

Average rainfall days in September - Fort Mill, SC
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (8.3 days).

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Average snowfall in September
Fort Mill, SC

Average snowfall in September - Fort Mill, SC
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.26").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Fort Mill, SC

Average snowfall days in September - Fort Mill, SC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average daylight in September /
Average sunshine in September
Fort Mill, SC

Average daylight in September / Average sunshine in September - Fort Mill, SC
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

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Average sunshine days in September
Fort Mill, SC

Average sunshine days in September - Fort Mill, SC
  • Average sunshine days in September: 16.9 days

The month with the most sunshine days is October (22 days).
The month with the least sunshine days is July (11.8 days).

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Average UV index in September
Fort Mill, SC

Average UV index in September - Fort Mill, SC
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in September
Fort Mill, SC

Average cloud cover in September - Fort Mill, SC
  • Average cloud cover in September: 34

The months with the most cloud cover are February and December (Cloud cover 44).
The month with the least cloud cover is June (Cloud cover 30).

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Average visibility in September
Fort Mill, SC

Average visibility in September - Fort Mill, 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).

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Fort Mill, South Carolina, USA

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