September weather forecastSaint Marys, GA
September
Weather in September
September marks the shift into autumn. The weather starts to cool down, and rainfall reduces significantly from August, lending a drier climate. Cloud coverage begins to increase, yet the daylight and sunshine hours endure, granting sufficient warmth. The temperature ranges from 73.8°F (23.2°C) to 85.8°F (29.9°C), shedding some of summer's intense heat.Temperature
The average high-temperature is a warm 85.8°F (29.9°C) in September, hardly different from the 90°F (32.2°C) recorded in August. During September, Saint Marys sees a mean low-temperature of 73.8°F (23.2°C).Heat index
In September, the heat index is evaluated at a sweltering 96.8°F (36°C). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.Understand that the heat index values take into account shaded locations and mild winds. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. 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 Saint Marys, the average relative humidity in September is 76%.Rainfall
In Saint Marys, in September, during 18.5 rainfall days, 2.68" (68mm) of precipitation is typically accumulated. Throughout the year, in Saint Marys, there are 165.4 rainfall days, and 23.15" (588mm) of precipitation is accumulated.Snowfall
In Saint Marys, snow does not fall in January, March through December.Daylight
The average length of the day in September is 12h and 20min.On the first day of the month, sunrise is at 7:03 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:19 am and sunset at 7:12 pm EDT.
Sunshine
In Saint Marys, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index in Saint Marys is 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The average daily UV index of 6 in September transforms into the following instructions:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. 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
Saint Marys, GA
- Average high temperature in September: 85.8°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (61.5°F).
- Average low temperature in September: 73.8°F
The month with the highest average low temperature is August (76.8°F).
The coldest month (with the lowest average low temperature) is January (47.7°F).
Average pressure in September
Saint Marys, GA
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.98"Hg).
Average wind speed in September
Saint Marys, GA
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in September
Saint Marys, GA
- Average humidity in September: 76%
The months with the highest relative humidity are August and December (77%).
The month with the lowest relative humidity is March (71%).
Average rainfall in September
Saint Marys, GA
- Average rainfall in September: 2.68"
The wettest month (with the highest rainfall) is August (3.9").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in September
Saint Marys, GA
- Average rainfall days in September: 18.5 days
The month with the highest number of rainy days is August (23.9 days).
The month with the least rainy days is February (8.3 days).
Average snowfall days in September
Saint Marys, GA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Saint Marys, GA
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Saint Marys, GA
- Average sunshine days in September: 8.7 days
The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is August (4.5 days).
Average UV index in September
Saint Marys, GA
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover in September
Saint Marys, GA
- Average cloud cover in September: 31
The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is May (Cloud cover 27).
Average visibility in September
Saint Marys, 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).
