September weather forecastMarietta, GA
September
Weather in September
September rings in the fall season in Marietta, with the temperature displaying a significant plunge compared to August's. Interestingly, the average number of sunny days soars to 15.5, hinting at clear, crisp autumn skies. The autumnal equinox by the end of September paves the way for October, characterized by even cooler temperatures. Cool and clear days, an autumnal cityscape bathed in a rich palette of hues - that's the charm of September in Marietta.Temperature
September signifies a gentle decline in Marietta's average high-temperature, easing from a hot 89.4°F (31.9°C) in August to a moderately hot 84°F (28.9°C). Marietta, in September, observes a steady average low-temperature of 65.5°F (18.6°C).Heat index
The heat index for September is calculated to be a hot 89.6°F (32°C). Continuing activity during long-lasting exposure might induce tiredness and result in heat cramps.Observations indicate that the heat index values are for shady locations with light wind. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'feels like', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
Humidity
In Marietta, Georgia, the average relative humidity in September is 69%.Rainfall
In Marietta, in September, it is raining for 12.8 days, with typically 2.76" (70mm) of accumulated precipitation. Throughout the year, there are 177.1 rainfall days, and 41.93" (1065mm) of precipitation is accumulated.Snowfall
In Marietta, snow does not fall in April through November.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September, sunrise is at 7:12 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 7:23 pm EDT.
Sunshine
In Marietta, the average sunshine in September is 8.5h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: In September, the maximum UV index of 5 suggests these recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Minimize direct exposure to the Sun during midday when its radiation is at its peak. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Marietta, GA
- Average high temperature in September: 84°F
The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (49.6°F).
- Average low temperature in September: 65.5°F
The month with the highest average low temperature is July (71.4°F).
The coldest month (with the lowest average low temperature) is January (34.2°F).
Average pressure in September
Marietta, GA
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed in September
Marietta, GA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
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%).
Average rainfall in September
Marietta, GA
- Average rainfall in September: 2.76"
The wettest month (with the highest rainfall) is August (4.88").
The driest month (with the least rainfall) is October (2.24").
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).
Average snowfall in September
Marietta, GA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.98").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
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).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Marietta, GA
- 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 36min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
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).
Average UV index in September
Marietta, GA
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
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).
Average visibility in September
Marietta, GA
- 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).
