Columbia
South Carolina, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Columbia, SC

The US State House of South Carolina, in Columbia, with the Wade Hampton Statue
The US State House of South Carolina, in Columbia, with the Wade Hampton Statue
The first month of the autumn, September, is also a moderately hot month in Columbia, South Carolina, with average temperature fluctuating between 85.3°F (29.6°C) and 64.2°F (17.9°C).

Temperature

In Columbia, South Carolina, the average high-temperature marginally drops, from a tropical 90.7°F (32.6°C) in August, to a warm 85.3°F (29.6°C). The average low-temperature, in September, is 64.2°F (17.9°C).

Heat index

In September, the average heat index is calculated to a sweltering 95.7°F (35.4°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, pregnancy, clothing, and wind affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in September is 75.9%.

Rainfall

In Columbia, it is raining for 7.3 days, with typically 3.5" (89.9mm) of accumulated precipitation. Throughout the year, there are 106.7 rainfall days, and 44.6" (1132.4mm) of precipitation is accumulated.

Snowfall

April through November are months without snowfall in Columbia.

Daylight

In September, the average length of the day is 12.4h.

Sunshine

In Columbia, the average sunshine in September is 8h.

UV index

In Columbia, the average daily maximum UV index is 8. A UV Index of 8 to 10 symbolizes a very high threat to health from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 8 transform into the following instructions:
Take extra precautions. Protection against sun damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Columbia?

The average high-temperature, in September, in Columbia, is 85.3°F (29.6°C), while the average low-temperature is 64.2°F (17.9°C). In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that combines relative humidity and air temperature, is calculated to 95.7°F (35.4°C).

What is the average humidity in September in Columbia?

The average relative humidity in September in Columbia is 75.9%.

How many days does it rain in September in Columbia?

In Columbia, in September, during 7.3 rainfall days, 3.5" (89.9mm) of precipitation is typically accumulated.

When it does not snow in Columbia?

April through November are months without snowfall in Columbia, South Carolina.

How many hours of daylight does Columbia have in September?

In September, the average length of the day in Columbia is 12.4h.

How many hours of sunshine does Columbia have in September?

The average sunshine in September in Columbia, South Carolina, is 8h.

What is the UV index intensity in September in Columbia?

In September, the average daily maximum UV index in Columbia, South Carolina, is 8. A UV Index reading of 8 to 10 represents a very high hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Columbia, SC
  • Average high temperature in September: 85.2°F

The warmest month (with the highest average high temperature) is July (92.7°F).
The month with the lowest average high temperature is January (56°F).

  • Average low temperature in September: 64.2°F

The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (33.7°F).

Average humidity in September - Columbia, SC
  • Average humidity in September: 75.9%

The month with the highest relative humidity is August (76.5%).
The month with the lowest relative humidity is April (62.1%).

Average rainfall in September - Columbia, SC
  • Average rainfall in September: 3.5"

The wettest month (with the highest rainfall) is July (5.5").
The driest month (with the lowest rainfall) is April (2.6").

Average rainfall days in September - Columbia, SC
  • Average rainfall days in September: 7.3 days

The month with the highest number of rainy days is July (11.8 days).
The month with the lowest number of rainy days is October (7 days).

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

The month with the highest snowfall is January (0.8").
Months with the lowest snowfall are April, May, June, July, August, September, October and November (0").

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

The month with the highest number of snowfall days is January (0.5 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September, October and November (0 days).

Average daylight in September / Average sunshine in September - Columbia, SC
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 8h

The month with most sunshine is May (Average sunshine: 9.4h).
Months with least sunshine are January and December (Average sunshine: 5.6).

Average UV index in September - Columbia, SC
  • Average UV index in September: 8

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).