September weather forecast
Marietta, GA

Weather in September

The first month of the autumn, September, is also a moderately hot month in Marietta, Georgia, with temperature in the range of an average low of 65.5°F (18.6°C) and an average high of 84°F (28.9°C).

Temperature

In September, the average high-temperature slightly decreases, from a tropical 89.4°F (31.9°C) in August, to a moderately hot 84°F (28.9°C). The average low-temperature, in Marietta, is 65.5°F (18.6°C).

Heat index

In September, the average heat index is estimated at a hot 90.1°F (32.3°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With 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 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like metabolic differences, wind, differences in body mass, height, and shape, 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 especially crucial for babies and toddlers. 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.

Humidity

In Marietta, the average relative humidity is 69%.

Rainfall

In September, the rain falls for 12.8 days. Throughout September, 2.76" (70mm) of precipitation is accumulated. Throughout the year, in Marietta, there are 177.1 rainfall days, and 41.93" (1065mm) of precipitation is accumulated.

Snowfall

In Marietta, Georgia, snow does not fall in April through November.

Daylight

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

Sunshine

The average sunshine in Marietta, Georgia, is 8.5h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Marietta?

The average high-temperature, in September, in Marietta, Georgia, is 84°F (28.9°C), while the average low-temperature is 65.5°F (18.6°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 90.1°F (32.3°C).

What is the average humidity in September in Marietta?

The average relative humidity in September in Marietta, Georgia, is 69%.

How much does it rain in Marietta in September?

In Marietta, Georgia, in September, during 12.8 rainfall days, 2.76" (70mm) of precipitation is typically accumulated.

When it does not snow in Marietta?

In Marietta, Georgia, snow does not fall in April through November.

What is the average length of the day in September in Marietta?

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

How long on average sun shines in September in Marietta?

In Marietta, the average sunshine in September is 8.5h.

What is the UV index reading in September in Marietta?

The average daily maximum UV index in September in Marietta, Georgia, is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Marietta, GA

Average temperature in September - Marietta, GA
  • Average high temperature in September: 28.9°C

The warmest month (with the highest average high temperature) is July (32.5°C).
The month with the lowest average high temperature is January (9.8°C).

  • Average low temperature in September: 18.6°C

The month with the highest average low temperature is July (21.9°C).
The coldest month (with the lowest average low temperature) is January (1.2°C).

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Average pressure in September
Marietta, GA

Average pressure in September - Marietta, GA
  • Average pressure in September: 1016.8mbar

The month with the highest atmospheric pressure is January (1021.5mbar).
The month with the lowest atmospheric pressure is June (1015.5mbar).

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Average wind speed in September
Marietta, GA

Average wind speed in September - Marietta, GA
  • Average wind speed in September: 8km/h

The windiest month (with the highest average wind speed) is January (13.1km/h).
The calmest month (with the lowest average wind speed) is August (7.5km/h).

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Average humidity in September
Marietta, GA

Average humidity in September - Marietta, GA
  • Average humidity in September: 69%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is August (68%).

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Average rainfall in September
Marietta, GA

Average rainfall in September - Marietta, GA
  • Average rainfall in September: 70mm

The wettest month (with the highest rainfall) is August (124mm).
The driest month (with the least rainfall) is October (57mm).

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Average rainfall days in September
Marietta, GA

Average rainfall days in September - Marietta, GA
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (9.5 days).

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Average snowfall in September
Marietta, GA

Average snowfall in September - Marietta, GA
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (25mm).
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
Marietta, GA

Average snowfall days in September - Marietta, GA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (1.6 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Marietta, GA

Average daylight in September / Average sunshine in September - Marietta, GA
  • Average daylight in September: 12.4h

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

  • Average sunshine in September: 8.5h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is December (Average sunshine: 5h).

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Average sunshine days in September
Marietta, GA

Average sunshine days in September - Marietta, GA
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is October (20.1 days).
The month with the least sunshine days is July (9.6 days).

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Average UV index in September
Marietta, GA

Average UV index in September - Marietta, GA
  • Average UV index in September: 5

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Marietta, GA

Average cloud cover in September - Marietta, GA
  • Average cloud cover in September: 32

The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 31).

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Average visibility in September
Marietta, GA

Average visibility in September - Marietta, GA
  • Average visibility in September: 9km

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

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