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September Weather in Atlanta, United States

Last updated: June 24, 2025

In Atlanta, United States, the average temperature in September hovers around 26°C (79°F). Expect a range from a cool 11°C (51°F) to a sizzling 38°C (100°F). During this time, the region receives an average of 96 mm (3.8 in) of precipitation spread across 9 days, contributing to an overall humidity level of 63%. Prepare for a diverse climate experience!

September Temperature in Atlanta

In September in Atlanta, the average temperature is 26°C (79°F), with maximums reaching up to 38°C (100°F) and minimums dropping to as low as 11°C (51°F). This makes it an ideal destination for travelers seeking a warm climate while allowing for some cooler evenings.

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

The chart illustrates September temperature patterns in Atlanta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Atlanta, September typically has an average temperature of 26°C (79°F), with highs reaching up to 38°C (100°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec475060647481838378685551
Data source: Temperature data for Atlanta 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 Atlanta

In Atlanta in September, the total precipitation amount is 96 mm (3.8 in) spread over a period of 9 days.

September Precipitation Trends in Atlanta

The chart displays monthly precipitation patterns in Atlanta, 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 Atlanta, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec10715513417115310589879610666130
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Atlanta

In Atlanta in September humidity is 63%. With average temperature 26°C (79°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls or exploring local attractions, though be prepared for a slight stickiness that may prompt you to seek shade or refreshing beverages along the way.

September Average Humidity in Atlanta

This chart illustrates the average monthly humidity levels in Atlanta, 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 Atlanta is approximately 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%78%79%81%77%72%65%63%70%82%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Atlanta

In Atlanta in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Atlanta.

Maximum UV Index Levels in Atlanta for September

The chart shows the monthly maximum UV Index (UVI) for Atlanta 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 Atlanta typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111111110864
Data source: Atlanta 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 Atlanta Compares to Other Months

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

This table compares monthly weather conditions in Atlanta, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)107 mm (4.2 inches)82%moderate
February Weather10°C (50°F)155 mm (6.1 inches)80%high
March Weather15°C (60°F)134 mm (5.3 inches)78%very high
April Weather18°C (65°F)171 mm (6.7 inches)79%very high
May Weather23°C (74°F)153 mm (6.0 inches)81%extreme
June Weather27°C (81°F)105 mm (4.1 inches)77%extreme
July Weather29°C (84°F)89 mm (3.5 inches)72%extreme
August Weather28°C (83°F)87 mm (3.4 inches)65%extreme
September Weather26°C (79°F)96 mm (3.8 inches)63%very high
October Weather20°C (68°F)106 mm (4.2 inches)70%very high
November Weather13°C (56°F)66 mm (2.6 inches)82%high
December Weather11°C (52°F)130 mm (5.1 inches)88%moderate

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