Last updated: June 24, 2025
In Atlanta, United States, the average temperature in September hovers around 20°C (69°F), making it a pleasant time to explore. However, be prepared for a range in temperatures, with minimums dipping to 4°C (40°F) and maximums soaring to 33°C (91°F). During the month, expect approximately 75 mm (2.9 in) of precipitation spread over 9 days, contributing to an average humidity of 78%. Whether you’re enjoying the sun or braving a drizzle, Atlanta offers a unique atmosphere this season!
In September in Atlanta, the average temperature is 20°C (69°F). Maximum temperatures can reach 33°C (91°F), while minimum temperatures can drop as low as 4°C (40°F). This range of temperatures makes Atlanta a great destination for outdoor activities and versatile wardrobe choices during your travels.
In Atlanta, in September, the precipitation amount is 75 mm (2.9 in) spread over the course of 9 days.
In Atlanta in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.
In Atlanta in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Atlanta.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 78 mm (3.1 inches) | 85% | moderate |
| February Weather | 0°C (32°F) | 87 mm (3.4 inches) | 85% | moderate |
| March Weather | 5°C (42°F) | 113 mm (4.4 inches) | 86% | high |
| April Weather | 11°C (52°F) | 93 mm (3.7 inches) | 87% | very high |
| May Weather | 18°C (64°F) | 143 mm (5.6 inches) | 81% | very high |
| June Weather | 23°C (73°F) | 113 mm (4.4 inches) | 82% | extreme |
| July Weather | 24°C (76°F) | 106 mm (4.2 inches) | 81% | very high |
| August Weather | 23°C (73°F) | 101 mm (4.0 inches) | 79% | very high |
| September Weather | 20°C (69°F) | 75 mm (2.9 inches) | 78% | very high |
| October Weather | 14°C (57°F) | 105 mm (4.1 inches) | 81% | high |
| November Weather | 5°C (41°F) | 83 mm (3.3 inches) | 89% | moderate |
| December Weather | 2°C (35°F) | 69 mm (2.7 inches) | 86% | low |