September weather forecastNorcross, GA
September
Weather in September
September, the first month of the autumn in Norcross, is also a moderately hot month, with an average temperature fluctuating between 65.5°F (18.6°C) and 83.8°F (28.8°C).Temperature
As August transitions into September, Norcross sees a gentle drop in the average high-temperature, transitioning from a tropical 89.4°F (31.9°C) to a moderately hot 83.8°F (28.8°C). During September, Norcross's temperature falls to a steady low-temperature average of 65.5°F (18.6°C).Heat index
For September, the heat index is evaluated at a hot 89.6°F (32°C). If one persists in activity during exposure, it could induce weariness and subsequently, heat cramps.Evaluating the heat index requires understanding its values in the shade and with gentle winds. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is achieved by amalgamating air temperature with the relative humidity readings. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. 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 quite important for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Humidity
In Norcross, the average relative humidity in September is 70%.Rainfall
In Norcross, in September, it is raining for 10.9 days, with typically 1.42" (36mm) of accumulated precipitation. Throughout the year, there are 154.1 rainfall days, and 23.74" (603mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 7:11 am and sunset at 8:02 pm. On the last day of September, sunrise is at 7:31 am and sunset at 7:22 pm EDT.
Sunshine
In Norcross, the average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: In September, the maximum UV index of 5 suggests these recommendations:
Take precautions - Protection against sun damage is advised. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Norcross, GA
- Average high temperature in September: 83.8°F
The warmest month (with the highest average high temperature) is July (90.7°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 (71.2°F).
The coldest month (with the lowest average low temperature) is January (34.3°F).
Average pressure in September
Norcross, 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
Norcross, GA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity in September
Norcross, GA
- Average humidity in September: 70%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is July (68%).
Average rainfall in September
Norcross, GA
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is August (3.58").
The driest months (with the least rainfall) are January and October (1.34").
Average rainfall days in September
Norcross, GA
- Average rainfall days in September: 10.9 days
The month with the highest number of rainy days is July (18.4 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in September
Norcross, GA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.31").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Norcross, GA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.1 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
Norcross, 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 36min
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
Norcross, GA
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is October (21.2 days).
The month with the least sunshine days is July (10.6 days).
Average UV index in September
Norcross, GA
- Average UV index in September: 5
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Norcross, GA
- Average cloud cover in September: 31
The months with the most cloud cover are February and December (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in September
Norcross, 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).
