September weather forecast
Halls Mill, SC

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Halls Mill, South Carolina, with an average temperature ranging between min 68.4°F (20.2°C) and max 85.5°F (29.7°C).

Temperature

Entering September, the average high-temperature is recorded at a moderately hot 85.5°F (29.7°C), exhibiting a minimal shift from August's 90.1°F (32.3°C). Throughout September, the nighttime temperature averages to an agreeable 68.4°F (20.2°C).

Heat index

The heat index value for September is evaluated at a torrid 96.8°F (36°C). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', blends air temperature and moisture content to represent the felt temperature to humans. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of 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 extremely significant for babies and toddlers. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

August, September and December, with an average relative humidity of 76%, are the most humid months.

Rainfall

In September, the rain falls for 11.6 days. Throughout September, 1.3" (33mm) of precipitation is accumulated. In Halls Mill, during the entire year, the rain falls for 138.1 days and collects up to 18.98" (482mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Daylight

In Halls Mill, South Carolina, the average length of the day in September is 12h and 22min.
On the first day of September, sunrise is at 6:59 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:10 pm EDT.

Sunshine

In Halls Mill, the average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum daily UV index of 6 during September morphs into the following directions:
Stay clear of intense sun exposure. Solar protection is of utmost significance. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot does it get in September?

Halls Mill in September has an average high-temperature of 85.5°F (29.7°C) and an average low-temperature of 68.4°F (20.2°C). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 96.8°F (36°C).

What are the most humid months?

August, September and December, with an average relative humidity of 76%, are most humid months.

What is the average humidity in September?

The average relative humidity in September is 76%.

How much does it rain in September?

In Halls Mill, in September, during 11.6 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

When it does not snow?

January, March through December are months without snowfall.

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

The average day length in September is 12h and 22min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:59 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:10 pm EDT.

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

The average sunshine duration in September is 8.5h.

What is the UV index intensity in September?

In Halls Mill, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to 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
Halls Mill, SC

Average temperature in September - Halls Mill, SC
  • Average high temperature in September: 85.5°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (55.9°F).

  • Average low temperature in September: 68.4°F

The month with the highest average low temperature is July (73.2°F).
The coldest month (with the lowest average low temperature) is January (39.9°F).

Average pressure in September
Halls Mill, SC

Average pressure in September - Halls Mill, 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 (29.97"Hg).

Average wind speed in September
Halls Mill, SC

Average wind speed in September - Halls Mill, SC
  • Average wind speed in September: 5.5mph

The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in September
Halls Mill, SC

Average humidity in September - Halls Mill, SC
  • Average humidity in September: 76%

The months with the highest relative humidity are August, September and December (76%).
The months with the lowest relative humidity are January and November (71%).

Average rainfall in September
Halls Mill, SC

Average rainfall in September - Halls Mill, SC
  • Average rainfall in September: 1.3"

The wettest month (with the highest rainfall) is August (2.13").
The driest month (with the least rainfall) is November (0.71").

Average rainfall days in September
Halls Mill, SC

Average rainfall days in September - Halls Mill, SC
  • Average rainfall days in September: 11.6 days

The month with the highest number of rainy days is August (17.9 days).
The month with the least rainy days is November (6.4 days).

Average snowfall in September
Halls Mill, SC

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

The month with the highest snowfall is February (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in September
Halls Mill, SC

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

The months with the highest number of snowfall days are January and February (0.2 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
Halls Mill, SC

Average daylight in September / Average sunshine in September - Halls Mill, 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 3min

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
Halls Mill, SC

Average sunshine days in September - Halls Mill, SC
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is November (21.9 days).
The month with the least sunshine days is July (10.3 days).

Average UV index in September
Halls Mill, SC

Average UV index in September - Halls Mill, 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
Halls Mill, SC

Average cloud cover in September - Halls Mill, SC
  • Average cloud cover in September: 33

The months with the most cloud cover are February and December (Cloud cover 42).
The months with the least cloud cover are July and October (Cloud cover 30).

Average visibility in September
Halls Mill, SC

Average visibility in September - Halls 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).

Halls Mill, South Carolina, USA

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