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

The start of September signals a gentle decrease in the average high-temperature, transitioning from a tropical 88.7°F (31.5°C) in August to a warm 83.3°F (28.5°C). Throughout September, Fort Mill experiences a low-temperature average of 64.2°F (17.9°C).

Heat index

The heat index in September is computed to be a hot 89.6°F (32°C). One might feel worn out with persistent exposure and activity, resulting in heat cramps.
Heat index values are typically calculated for conditions of shade and a light breeze. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.

Humidity

The average relative humidity in September is 72%.

Rainfall

September and October are months with the least rain when the rain falls for 11.5 days and typically aggregates up to 1.81" (46mm) of rain.

Snowfall

April through November are months without snowfall.

Daylight

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

Sunshine

In Fort Mill, the average sunshine in September is 8.6h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.

Frequently asked questions

How hot does it get in Fort Mill in September?

The average high-temperature, in September, in Fort Mill, is 83.3°F (28.5°C), while the average low-temperature is 64.2°F (17.9°C). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, is computed to be 89.6°F (32°C).

What is the average humidity in September?

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

What is the driest month?

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

How much does it rain in September?

In September, the rain falls for 11.5 days. Throughout September, 1.81" (46mm) of precipitation is accumulated.

When it does not snow?

April through November are months without snowfall.

What is the average length of the day in September?

The average day length in September is 12h and 23min.

When are sunrise and sunset in September?

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.

How long on average sun shines in September?

In September, the average sunshine duration in Fort Mill is 8.6h.

What is the UV index reading in September?

In Fort Mill, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

Fort Mill, South Carolina, USA

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