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September Weather in Chattanooga Valley, United States

Last updated: June 24, 2025

In September, the average temperature in Chattanooga Valley, United States hovers around 24°C (75°F). Expect a range from a brisk minimum of 9°C (48°F) to a scorching maximum of 37°C (98°F). Rainfall is moderate, with 106 mm (4.2 in) falling over 8 days, and the average humidity sits comfortably at 64%.

September Temperature in Chattanooga Valley

In September in Chattanooga Valley, the average temperature is 24°C (75°F). Maximum temperatures can reach 37°C (98°F), while minimums can drop as low as 9°C (48°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

September Weather in Chattanooga Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Chattanooga Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chattanooga Valley, September typically has an average temperature of 24°C (75°F), with highs reaching up to 37°C (98°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec434854607076797874645046
Data source: Temperature data for Chattanooga Valley 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 Chattanooga Valley

In Chattanooga Valley in September, the precipitation amount is 106 mm (4.2 in) over a span of 8 days.

September Precipitation Trends in Chattanooga Valley

The chart displays monthly precipitation patterns in Chattanooga Valley, 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 Chattanooga Valley, September typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec991711691569612010612110613372139
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chattanooga Valley

In Chattanooga Valley in September humidity is 64%. With average temperature 24°C (75°F), this humidity feels like a warm blanket enveloping you, making outdoor exploration both refreshing and a little sticky, perfect for leisurely strolls and shaded cafes but with a need for frequent water breaks.

September Average Humidity in Chattanooga Valley

This chart illustrates the average monthly humidity levels in Chattanooga Valley, 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 Chattanooga Valley is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chattanooga Valley

In Chattanooga Valley 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 Chattanooga Valley.

Maximum UV Index Levels in Chattanooga Valley for September

The chart shows the monthly maximum UV Index (UVI) for Chattanooga Valley 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 Chattanooga Valley typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109753
Data source: Chattanooga Valley 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 Chattanooga Valley Compares to Other Months

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

This table compares monthly weather conditions in Chattanooga Valley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)99 mm (3.9 inches)87%moderate
February Weather9°C (48°F)171 mm (6.7 inches)87%high
March Weather12°C (54°F)169 mm (6.7 inches)85%very high
April Weather16°C (60°F)156 mm (6.2 inches)82%very high
May Weather21°C (70°F)96 mm (3.8 inches)83%extreme
June Weather24°C (76°F)120 mm (4.7 inches)82%extreme
July Weather26°C (80°F)106 mm (4.2 inches)78%extreme
August Weather26°C (78°F)121 mm (4.8 inches)67%very high
September Weather24°C (75°F)106 mm (4.2 inches)64%very high
October Weather18°C (65°F)133 mm (5.2 inches)74%high
November Weather10°C (50°F)72 mm (2.8 inches)87%moderate
December Weather8°C (46°F)139 mm (5.5 inches)88%moderate

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