September weather forecast
Columbia, MS

Weather in September

September, the first month of the autumn, in Columbia, is still a hot month, with temperature in the range of an average low of 68.2°F (20.1°C) and an average high of 87.4°F (30.8°C).

Temperature

In Columbia, Mississippi, the average high-temperature is relatively the same as in August - a still tropical 87.4°F (30.8°C). In September, the average low-temperature is 68.2°F (20.1°C).

Heat index

In September, the average heat index is computed to be a sweltering 102°F (38.9°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, clothing, metabolic differences, 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through 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

In September, the average relative humidity is 76%.

Rainfall

In September, in Columbia, the rain falls for 17.2 days. Throughout September, 2.48" (63mm) of precipitation is accumulated. In Columbia, during the entire year, the rain falls for 172.7 days and collects up to 30.91" (785mm) of precipitation.

Snowfall

In Columbia snow does not fall in April through November.

Daylight

In Columbia, the average length of the day in September is 12.3h.

Sunshine

In Columbia, the average sunshine is 9.3h.

UV index

The average daily maximum UV index in Columbia is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Columbia?

The average high-temperature, in September, in Columbia, is 87.4°F (30.8°C), while the average low-temperature is 68.2°F (20.1°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 102°F (38.9°C).

What is the average humidity in September in Columbia?

In Columbia, the average relative humidity in September is 76%.

How many days does it rain in September in Columbia?

In Columbia, in September, during 17.2 rainfall days, 2.48" (63mm) of precipitation is typically accumulated.

When it does not snow in Columbia?

April through November are months without snowfall in Columbia.

How many hours of daylight does Columbia have in September?

In Columbia, Mississippi, the average length of the day in September is 12.3h.

How long on average sun shines in September in Columbia?

In September, the average sunshine in Columbia, Mississippi, is 9.3h.

How high is the UV index in September in Columbia?

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Columbia, MS

Average temperature in September - Columbia, MS
  • Average high temperature in September: 30.8°C

The warmest month (with the highest average high temperature) is August (33°C).
The month with the lowest average high temperature is January (13.8°C).

  • Average low temperature in September: 20.1°C

The month with the highest average low temperature is August (22.5°C).
The coldest month (with the lowest average low temperature) is January (4.4°C).

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Average pressure in September
Columbia, MS

Average pressure in September - Columbia, MS
  • Average pressure in September: 1015.4mbar

The month with the highest atmospheric pressure is January (1021.8mbar).
The month with the lowest atmospheric pressure is June (1014.8mbar).

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Average wind speed in September
Columbia, MS

Average wind speed in September - Columbia, MS
  • Average wind speed in September: 7.7km/h

The windiest month (with the highest average wind speed) is April (11km/h).
The calmest month (with the lowest average wind speed) is July (7.2km/h).

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Average humidity in September
Columbia, MS

Average humidity in September - Columbia, MS
  • Average humidity in September: 76%

The month with the highest relative humidity is December (81%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Columbia, MS

Average rainfall in September - Columbia, MS
  • Average rainfall in September: 63mm

The wettest month (with the highest rainfall) is August (102mm).
The driest month (with the least rainfall) is November (38mm).

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Average rainfall days in September
Columbia, MS

Average rainfall days in September - Columbia, MS
  • Average rainfall days in September: 17.2 days

The month with the highest number of rainy days is August (22.6 days).
The month with the least rainy days is November (7.8 days).

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Average snowfall in September
Columbia, MS

Average snowfall in September - Columbia, MS
  • Average snowfall in September: 0mm

The month with the highest snowfall is December (10mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

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Average snowfall days in September
Columbia, MS

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

The month with the highest number of snowfall days is January (0.6 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average daylight in September /
Average sunshine in September
Columbia, MS

Average daylight in September / Average sunshine in September - Columbia, MS
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.2h).
The month with the shortest days is December (Average daylight: 10.1h).

  • Average sunshine in September: 9.3h

The month with the most sunshine is June (Average sunshine: 10.7h).
The months with the least sunshine are February and December (Average sunshine: 4.9).

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Average sunshine days in September
Columbia, MS

Average sunshine days in September - Columbia, MS
  • Average sunshine days in September: 10.8 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is July (6.7 days).

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Average UV index in September
Columbia, MS

Average UV index in September - Columbia, MS
  • 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).

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Average cloud cover in September
Columbia, MS

Average cloud cover in September - Columbia, MS
  • Average cloud cover in September: 32

The months with the most cloud cover are February and December (Cloud cover 49).
The month with the least cloud cover is October (Cloud cover 29).

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Average visibility in September
Columbia, MS

Average visibility in September - Columbia, MS
  • Average visibility in September: 8km

The months with the highest visibility are January, October and November (9km).
The months with the lowest visibility are February, March, April, May, June, July, August, September and December (8km).

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