Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
As August shifts into September, a minor alteration in temperatures is observed, with average highs reducing from a hot 87.3°F (30.7°C) to a warm 80.8°F (27.1°C). During the month of September, the nighttime temperature falls to an average of 59.5°F (15.3°C).Heat index
The heat index for September is estimated at 84.2°F (29°C). Long-standing exposure coupled with ongoing activity could result in exhaustion, possibly causing heat cramps.The metrics for the heat index are tailored for both shady environments and light winds. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Humidity
In Robertsville, the average relative humidity in September is 74%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.8 days and typically collects 1.85" (47mm) of precipitation.Snowfall
In Robertsville, snow does not fall in May through October.Daylight
In Robertsville, the average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 7:09 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:21 pm EDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
In Robertsville, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In September, the UV index of 5 transforms into the following advice:
Take precautions - Protection against sun damage is advised. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Robertsville have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Robertsville, TN
- Average high temperature in September: 80.8°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (44.4°F).
- Average low temperature in September: 59.5°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (29.3°F).
Average pressure in September
Robertsville, TN
- Average pressure in September: 30.04"Hg
The months with the highest atmospheric pressure are January and November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Robertsville, TN
- Average wind speed in September: 3.9mph
The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in September
Robertsville, TN
- Average humidity in September: 74%
The months with the highest relative humidity are February and December (79%).
The month with the lowest relative humidity is August (73%).
Average rainfall in September
Robertsville, TN
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is February (3.98").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in September
Robertsville, TN
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in September
Robertsville, TN
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.61").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Robertsville, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Robertsville, TN
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in September
Robertsville, TN
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (12.2 days).
Average UV index in September
Robertsville, TN
- 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 and December (UV index 2).
Average cloud cover in September
Robertsville, TN
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 53).
The months with the least cloud cover are June and August (Cloud cover 29).
Average visibility in September
Robertsville, TN
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Robertsville, Tennessee, USA
Weather forecast for your location
2. Allow the app to use your location