September weather forecast
Chester, SC

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Weather in September

The first month of the autumn, September, is still a warm month in Chester, South Carolina, with an average temperature ranging between min 65.1°F (18.4°C) and max 83.8°F (28.8°C).

Temperature

The start of September signals a gentle decrease in the average high-temperature, transitioning from a tropical 89.6°F (32°C) in August to a moderately hot 83.8°F (28.8°C). In Chester, the average nighttime temperature during September is a comfortable 65.1°F (18.4°C).

Heat index

The average heat index in September is estimated at a tropical 91.4°F (33°C). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
Note that heat index values are valued for light wind and location in the shade. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.

Humidity

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

Rainfall

September is the month with the least rainfall. Rain falls for 12.5 days and accumulates 1.89" (48mm) of precipitation.

Snowfall

In Chester, snow does not fall in April through November.

Daylight

In Chester, the average length of the day in September is 12h and 23min.
On the first day of September, sunrise is at 6:58 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:09 pm EDT.

Sunshine

In Chester, South Carolina, the average sunshine in September is 8.7h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: A daily maximum UV index of 5 in September translates into the following instructions:
Guard yourself - An obligation to protect skin and eyes from harm exists. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Updated: Jun 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it hot during September?

During September, Chester experiences an average high-temperature of 83.8°F (28.8°C) and a low-temperature of 65.1°F (18.4°C). The average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in September is estimated at 91.4°F (33°C).

What is the average humidity in September?

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

What is the driest month?

September is the month with the least rainfall. Rain falls for 12.5 days and accumulates 1.89" (48mm) of precipitation.

How many days does it rain in September?

In Chester, in September, it is raining for 12.5 days, with typically 1.89" (48mm) of accumulated precipitation.

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 is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:58 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:09 pm EDT.

How long on average sun shines in September?

In Chester, the average sunshine duration in September is 8.7h.

What is the UV index intensity in September?

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 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
Chester, SC

Average temperature in September - Chester, SC
  • Average high temperature in September: 83.8°F

The warmest month (with the highest average high temperature) is July (91.8°F).
The month with the lowest average high temperature is January (50.5°F).

  • Average low temperature in September: 65.1°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 (34.7°F).

Average pressure in September
Chester, SC

Average pressure in September - Chester, 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
Chester, SC

Average wind speed in September - Chester, SC
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in September
Chester, SC

Average humidity in September - Chester, SC
  • Average humidity in September: 72%

The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is July (70%).

Average rainfall in September
Chester, SC

Average rainfall in September - Chester, SC
  • Average rainfall in September: 1.89"

The wettest month (with the highest rainfall) is August (3.35").
The driest month (with the least rainfall) is September (1.89").

Average rainfall days in September
Chester, SC

Average rainfall days in September - Chester, SC
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is July (19.3 days).
The month with the least rainy days is October (8.8 days).

Average snowfall in September
Chester, SC

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

The month with the highest snowfall is December (0.67").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in September
Chester, SC

Average snowfall days in September - Chester, SC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 8h and 4min

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 30min).

Average sunshine days in September
Chester, SC

Average sunshine days in September - Chester, SC
  • Average sunshine days in September: 16.1 days

The month with the most sunshine days is October (21.3 days).
The month with the least sunshine days is July (8.8 days).

Average UV index in September
Chester, SC

Average UV index in September - Chester, SC
  • Average UV index in September: 5

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

Average cloud cover in September
Chester, SC

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

The months with the most cloud cover are February and December (Cloud cover 42).
The month with the least cloud cover is June (Cloud cover 29).

Average visibility in September
Chester, SC

Average visibility in September - Chester, 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).

Chester, South Carolina, USA

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