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September Weather in Roanoke, United States

Last updated: June 24, 2025

In Roanoke, United States during September, the average temperature is a pleasant 21°C (70°F). Expect a range where the minimum dips to 4°C (39°F) and the maximum peaks at a warm 35°C (95°F). With 112 mm (4.4 in) of precipitation over about 10 days, be prepared for occasional rain showers. The average humidity sits at 68%, creating a comfortably warm and slightly humid atmosphere.

September Temperature in Roanoke

In September in Roanoke, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F), and minimums can be as low as 4°C (39°F). This makes Roanoke an ideal destination for travelers seeking pleasant weather along with opportunities for both warm and cool activities.

September Weather in Roanoke: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Roanoke, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roanoke, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec374247566572777569604541
Data source: Temperature data for Roanoke generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Roanoke

In Roanoke in September, the total precipitation amount is 112 mm (4.4 in) over the course of 10 days.

September Precipitation Trends in Roanoke

The chart displays monthly precipitation patterns in Roanoke, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Roanoke, September typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6910574119144114601001121107495
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Roanoke

In Roanoke in September humidity is 68%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making the air feel slightly heavy and sticky, which can be quite exhausting for travelers.

September Average Humidity in Roanoke

This chart illustrates the average monthly humidity levels in Roanoke, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Roanoke is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Roanoke

In Roanoke in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Roanoke.

Maximum UV Index Levels in Roanoke for September

The chart shows the monthly maximum UV Index (UVI) for Roanoke in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Roanoke typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810101110109753
Data source: Roanoke September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Roanoke Compares to Other Months

Weather in Roanoke varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Roanoke, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Roanoke, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)69 mm (2.7 inches)87%moderate
February Weather6°C (42°F)105 mm (4.1 inches)87%high
March Weather8°C (47°F)74 mm (2.9 inches)86%very high
April Weather13°C (56°F)119 mm (4.7 inches)84%very high
May Weather18°C (65°F)144 mm (5.6 inches)83%very high
June Weather22°C (72°F)114 mm (4.5 inches)83%extreme
July Weather25°C (77°F)60 mm (2.4 inches)79%very high
August Weather24°C (75°F)99 mm (3.9 inches)66%very high
September Weather21°C (70°F)112 mm (4.4 inches)68%very high
October Weather15°C (60°F)110 mm (4.3 inches)78%high
November Weather7°C (45°F)74 mm (2.9 inches)89%moderate
December Weather5°C (41°F)95 mm (3.7 inches)86%moderate

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