September weather forecastRound Rock, TN
September
Weather in September
The first month of the autumn, September, is still a warm month in Round Rock, Tennessee, with an average temperature ranging between max 80.2°F (26.8°C) and min 58.1°F (14.5°C).Temperature
In September, the average high-temperature marginally decreases from a hot 86.2°F (30.1°C) in August to a warm 80.2°F (26.8°C). September nights show a substantial disparity from the daytime peak with an average low-temperature of 58.1°F (14.5°C).Humidity
In September, the average relative humidity in Round Rock is 76%.Rainfall
September is the month with the least rainfall. Rain falls for 13.1 days and accumulates 2.2" (56mm) of precipitation.Snowfall
May through September are months without snowfall in Round Rock.Daylight
In Round Rock, the average length of the day in September is 12h and 24min.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 8.5h.UV index
The average daily maximum UV index in September in Round Rock, Tennessee, is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Round Rock, TN
- Average high temperature in September: 80.2°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (43.2°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (28.9°F).
Average pressure in September
Round Rock, TN
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Round Rock, TN
- Average wind speed in September: 3.7mph
The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in September
Round Rock, TN
- Average humidity in September: 76%
The months with the highest relative humidity are February and December (80%).
The months with the lowest relative humidity are June, July and August (75%).
Average rainfall in September
Round Rock, TN
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is February (4.8").
The driest month (with the least rainfall) is September (2.2").
Average rainfall days in September
Round Rock, TN
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is July (19.3 days).
The month with the least rainy days is November (10.7 days).
Average snowfall in September
Round Rock, TN
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Round Rock, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.1 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
Round Rock, 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 January (Average sunshine: 4h and 48min).
Average sunshine days in September
Round Rock, TN
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in September
Round Rock, 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
Round Rock, TN
- Average cloud cover in September: 32
The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in September
Round Rock, TN
- Average visibility in September: 6mi
The months with the highest visibility are April, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, May and December (5mi).
