September weather forecastColumbia, SC
September
Weather in September
September in Columbia, South Carolina signals the onset of autumn. The high averages decrease to 84.6°F (29.2°C) giving respite from the summer heat. The average% of possible sunshine drops when compared to August. The rainfall day count drops significantly offering drier conditions. Wind speeds slightly rise promising a refreshing touch to the weather.Temperature
The shift from August to September coincides with a small decrease in the average high-temperature, down to a warm 84.6°F (29.2°C) from a tropical 90.1°F (32.3°C). An average low-temperature of 67.5°F (19.7°C) is noted during the month of September.Heat index
For September, the heat index is computed to be a hot 93.2°F (34°C). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.Take note of the fact that heat index values are based on shaded circumstances with light airflows. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', takes into account both air temperature and humidity to illustrate what people actually feel. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
Humidity
In Columbia, the average relative humidity in September is 72%.Rainfall
September is the month with the least rainfall. Rain falls for 11 days and accumulates 1.46" (37mm) of precipitation.Snowfall
March through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 6:58 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:18 am and sunset at 7:09 pm EDT.
Sunshine
In Columbia, the average sunshine in September is 8.5h.UV index
In Columbia, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In September, a daily UV index of 6 turns into the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Columbia, SC
- Average high temperature in September: 84.6°F
The warmest month (with the highest average high temperature) is July (91.6°F).
The month with the lowest average high temperature is January (52.9°F).
- Average low temperature in September: 67.5°F
The month with the highest average low temperature is July (73.8°F).
The coldest month (with the lowest average low temperature) is January (37.9°F).
Average pressure in September
Columbia, SC
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Columbia, SC
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Columbia, SC
- Average humidity in September: 72%
The month with the highest relative humidity is December (74%).
The months with the lowest relative humidity are January, July and November (69%).
Average rainfall in September
Columbia, SC
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is December (2.91").
The driest month (with the least rainfall) is September (1.46").
Average rainfall days in September
Columbia, SC
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is October (7.3 days).
Average snowfall in September
Columbia, SC
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.47").
The months with the least snowfall are March, 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 February (0.3 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
Columbia, SC
- Average daylight in September: 12h and 24min
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 30min
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
Columbia, SC
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is October (22.7 days).
The month with the least sunshine days is July (11.7 days).
Average UV index in September
Columbia, 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, February and December (UV index 3).
Average cloud cover in September
Columbia, SC
- Average cloud cover in September: 32
The months with the most cloud cover are February and December (Cloud cover 42).
The months with the least cloud cover are June and October (Cloud cover 29).
Average visibility in September
Columbia, 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).
