September weather forecast
Roanoke, VA

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Stunning dawn in the city of Roanoke, Virginia
Stunning dawn in the city of Roanoke, Virginia

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.
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Frequently asked questions

What is the average September temperature in Roanoke?

During September, Roanoke experiences an average high-temperature of 77.7°F (25.4°C) and a low-temperature of 56.1°F (13.4°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, is computed to be 93.2°F (34°C).

What is the most humid month in Roanoke?

The months with the highest humidity are May, September and December, with an average relative humidity of 77%.

What is the average humidity in September in Roanoke?

In Roanoke, Virginia, the average relative humidity in September is 77%.

What is the driest month in Roanoke?

The month with the least rainfall in Roanoke is September, when the rain falls for 12.9 days and typically collects 1.61" (41mm) of precipitation.

How many days does it rain in September in Roanoke?

In September, in Roanoke, Virginia, the rain falls for 12.9 days. Throughout September, 1.61" (41mm) of precipitation is accumulated.

When it does not snow in Roanoke?

May through September are months without snowfall in Roanoke, Virginia.

Does it snow in Roanoke in September?

In Roanoke, Virginia, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Roanoke have in September?

In September, the average day length in Roanoke, Virginia, is 12h and 25min.

When is the sunrise / sunset in September in Roanoke?

In September, on the first day of the month, sunrise is at 6:50 am and sunset at 7:48 pm. On the last day of the month, in Roanoke, Virginia, sunrise is at 7:14 am and sunset at 7:04 pm EDT.

How many hours of sunshine does Roanoke have in September?

The average sunshine duration in September is 8.3h.

What is the UV index intensity in September in Roanoke?

The average daily maximum UV index in September in Roanoke is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Roanoke, VA

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).

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Average pressure in September
Roanoke, VA

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).

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Average wind speed in September
Roanoke, VA

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).

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Average humidity in September
Roanoke, VA

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%).

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Average rainfall in September
Roanoke, VA

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").

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Average rainfall days in September
Roanoke, VA

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).

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Average snowfall in September
Roanoke, VA

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").

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Average snowfall days in September
Roanoke, VA

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).

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Average daylight in September /
Average sunshine in September
Roanoke, VA

Average daylight in September / Average sunshine in September - Roanoke, VA
  • Average daylight in September: 12h and 2min

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 2min

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).

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Average sunshine days in September
Roanoke, VA

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).

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Average UV index in September
Roanoke, VA

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).

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Average cloud cover in September
Roanoke, VA

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).

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Average visibility in September
Roanoke, VA

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).

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Roanoke, Virginia, USA

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