September weather forecastMount Juliet, TN
September
Weather in September
Mount Juliet experiences a slow transition towards cooler weather during September. Prominent changes include a decrease in overall rainfall and a slow-but-steady decline in temperatures. The length of daylight hours continues to dwindle, marking the days' slow march towards winter. Occasional windy conditions keep the temperatures in check. The pressure increases slightly as the humidity remains more or less constant.Temperature
The arrival of September in Mount Juliet, Tennessee, correlates with a minor temperature reduction, down from August's tropical 86.5°F (30.3°C) to a moderately hot 81.1°F (27.3°C). Mount Juliet's average low-temperature during September nights is observed to be a comfortable 62.2°F (16.8°C).Heat index
During September, the heat index is evaluated at a tropical 86°F (30°C). Persisting in activity during exposure could lead to weariness and subsequently to heat cramps.Heat index evaluations are typically in the context of light winds and shaded environments. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are essentially critical for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
Humidity
In September, the average relative humidity is 75%.Rainfall
In Mount Juliet, during September, the rain falls for 12.9 days and regularly aggregates up to 1.65" (42mm) of precipitation. Throughout the year, in Mount Juliet, Tennessee, there are 159.4 rainfall days, and 25.12" (638mm) of precipitation is accumulated.Snowfall
In Mount Juliet, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 24min.On the first day of September, sunrise is at 6:18 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:30 pm CDT.
Sunshine
In Mount Juliet, Tennessee, the average sunshine in September is 8.5h.UV index
In Mount Juliet, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 5 during September leads to these advisories:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mount Juliet, TN
- Average high temperature in September: 81.1°F
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (44.1°F).
- Average low temperature in September: 62.2°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).
Average pressure in September
Mount Juliet, TN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Mount Juliet, TN
- Average wind speed in September: 4.9mph
The windiest month (with the highest average wind speed) is February (8mph).
The calmest months (with the lowest average wind speed) are July and August (4.5mph).
Average humidity in September
Mount Juliet, TN
- Average humidity in September: 75%
The month with the highest relative humidity is December (79%).
The months with the lowest relative humidity are June, October and November (74%).
Average rainfall in September
Mount Juliet, TN
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is July (3.46").
The driest month (with the least rainfall) is November (1.42").
Average rainfall days in September
Mount Juliet, TN
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is July (19.1 days).
The month with the least rainy days is November (8.7 days).
Average snowfall in September
Mount Juliet, TN
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.83").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Mount Juliet, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.1 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
Mount Juliet, TN
- Average daylight in September: 12h and 24min
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 42min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in September
Mount Juliet, TN
- Average sunshine days in September: 15.2 days
The months with the most sunshine days are October and November (19.3 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in September
Mount Juliet, 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
Mount Juliet, TN
- Average cloud cover in September: 32
The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in September
Mount Juliet, TN
- 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).
