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
The transition into September shows a subtle variation to a still moderately hot 74.3°F (23.5°C) from August's 78.6°F (25.9°C) in the average high-temperature. Throughout September, Roan Mountain's nights cool down to an average of 54°F (12.2°C).Humidity
In Roan Mountain, the average relative humidity in September is 79%.Rainfall
The month with the least rainfall is September, when the rain falls for 13.7 days and typically collects 1.38" (35mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 24min.On the first day of September, sunrise is at 7:00 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:12 pm EDT.
Sunshine
The average sunshine in September is 8.3h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Be vigilant - Preventing sunburn is recommended. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Roan Mountain, TN
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in September
Roan Mountain, TN
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed in September
Roan Mountain, TN
- Average wind speed in September: 4mph
The windiest months (with the highest average wind speed) are January and February (7.1mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).
Average humidity in September
Roan Mountain, TN
- Average humidity in September: 79%
The months with the highest relative humidity are February, March, May and December (80%).
The months with the lowest relative humidity are June and November (77%).
Average rainfall in September
Roan Mountain, TN
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is July (3.07").
The driest month (with the least rainfall) is September (1.38").
Average rainfall days in September
Roan Mountain, TN
- Average rainfall days in September: 13.7 days
The month with the highest number of rainy days is July (20.2 days).
The month with the least rainy days is November (10.6 days).
Average snowfall in September
Roan Mountain, TN
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.65").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Roan Mountain, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Roan Mountain, 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 42min).
- Average sunshine in September: 8h and 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in September
Roan Mountain, TN
- Average sunshine days in September: 13.2 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is July (9 days).
Average UV index in September
Roan Mountain, TN
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Roan Mountain, TN
- Average cloud cover in September: 39
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 35).
Average visibility in September
Roan Mountain, TN
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
Roan Mountain, Tennessee, USA
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