September weather forecastRoanoke, VA
September
Weather in September
With the arrival of September comes the beginning of fall in Roanoke. Even though the weather remains warmer with highs reaching 77.7°F (25.4°C), a subtle drop in temperature signifies a shift from the scorching summer towards the cooler autumn. Extended daylight hours start to shorten, providing an opportunity to witness beautiful sunsets. Rainfall also decreases, paving way for picturesque, clear skies. As September ends, the city prepares itself to welcome the vibrant foliage of October.Temperature
Roanoke's transition into September involves a gentle shift in temperature, receding from 84.4°F (29.1°C) in August to a still moderately hot 77.7°F (25.4°C). Throughout September, the average low-temperature in Roanoke records at a mild 56.1°F (13.4°C).Humidity
The months with the highest humidity are May, September and December, with an average relative humidity of 77%.Rainfall
September is the month with the least rainfall. Rain falls for 12.9 days and accumulates 1.61" (41mm) of precipitation.Snowfall
In Roanoke, snow does not fall in May through September.Daylight
In Roanoke, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:50 am and sunset at 7:48 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:04 pm EDT.
Sunshine
The average sunshine in September is 8.3h.UV index
In September, the average daily maximum UV index in Roanoke is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 suggests this advice:
Take precautions - Protection against sunburn is recommended. To guard against the harmful effects of the Sun, minimize exposure during midday. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Roanoke, VA
- Average high temperature in September: 77.7°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 (41.2°F).
- Average low temperature in September: 56.1°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in September
Roanoke, VA
- 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 (29.98"Hg).
Average wind speed in September
Roanoke, VA
- Average wind speed in September: 4.2mph
The windiest month (with the highest average wind speed) is February (6.8mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in September
Roanoke, VA
- Average humidity in September: 77%
The months with the highest relative humidity are May, September and December (77%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Roanoke, VA
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in September
Roanoke, VA
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is November (7.6 days).
Average snowfall in September
Roanoke, VA
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.76").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Roanoke, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (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
Roanoke, VA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
Roanoke, VA
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is May (11.6 days).
Average UV index in September
Roanoke, VA
- 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, November and December (UV index 2).
Average cloud cover in September
Roanoke, VA
- Average cloud cover in September: 39
The month with the most cloud cover is February (Cloud cover 45).
The months with the least cloud cover are June and July (Cloud cover 31).
Average visibility in September
Roanoke, VA
- Average visibility in September: 5mi
The months with the highest visibility are June, July and November (6mi).
The months with the lowest visibility are January, February, March, April, May, August, September, October and December (5mi).
