September weather forecast and climate
Columbia, MS

September, the first month of the autumn, in Columbia, is still a tropical month, with average temperature varying between 87.4°F (30.8°C) and 68.2°F (20.1°C).

Temperature

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

Heat index

The average heat index in September is evaluated at a sweltering 102°F (38.9°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. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like wind, metabolic differences, pregnancy, and activity influence one's weather impression. 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. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

In September, the average relative humidity is 76%.

Rainfall

In September, the rain falls for 17.2 days. Throughout September, 2.48" (63mm) of precipitation is accumulated. Throughout the year, in Columbia, there are 172.7 rainfall days, and 30.91" (785mm) of precipitation is accumulated.

Snowfall

In Columbia snow does not fall in April through November.

Daylight

The average length of the day in Columbia is 12.3h.

Sunshine

The average sunshine in Columbia is 9.3h.

UV index

In September, the average daily maximum UV index in Columbia is 6. A UV Index estimate of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. 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.

What is the temperature in September in Columbia?

The average high-temperature, in September, is 87.4°F (30.8°C), while the average low-temperature is 68.2°F (20.1°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), that combines air temperature and relative humidity, in September is appraised at 102°F (38.9°C).

What is the average humidity in September in Columbia?

The average relative humidity in September in Columbia, Mississippi, is 76%.

How many days does it rain in September in Columbia?

In September, in Columbia, the rain falls for 17.2 days. Throughout September, 2.48" (63mm) of precipitation is accumulated.

When it does not snow in Columbia?

In Columbia, Mississippi, snow does not fall in April through November.

How many hours of daylight does Columbia have in September?

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

How long on average sun shines in September in Columbia?

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

What is the UV index intensity 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 unprotected exposure to the UV radiation.
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).

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).

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).

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%).

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).

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).

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

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

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).
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, 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).
Months with the least sunshine are February and December (Average sunshine: 4.9).

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).

Average UV index in September - Columbia, MS
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January and December (UV index 3).

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

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).

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

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