Last updated: June 24, 2025
In Decatur, United States, the average temperature in September hovers around 21°C (71°F), with a minimum dipping to 6°C (42°F) and a maximum reaching up to 34°C (93°F). Expect approximately 71 mm (2.8 in) of precipitation spread over 7 days, while the average humidity remains a comfortable 79%. Embrace the warmth and occasional rain as you explore the beauty of this vibrant locale!
In September in Decatur, the average temperature is 21°C (71°F). The maximum can reach 34°C (93°F), and the minimum can be as low as 6°C (42°F). This diverse range of temperatures makes it a favorable time for travelers to enjoy outdoor activities and explore the local attractions comfortably.
In Decatur in September, the precipitation amount is 71 mm (2.8 in) over a span of 7 days.
In Decatur in September humidity is 79%. With an average temperature of 21°C (71°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel laborious and exhausting. Travelers should be prepared to hydrate frequently and take breaks in shaded areas to fully enjoy their time exploring.
In Decatur 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 Decatur.
UV Risk Categories
Weather in Decatur varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Decatur, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 76 mm (3.0 inches) | 84% | moderate |
| February Weather | 0°C (32°F) | 76 mm (3.0 inches) | 82% | moderate |
| March Weather | 6°C (44°F) | 131 mm (5.2 inches) | 84% | high |
| April Weather | 11°C (53°F) | 132 mm (5.2 inches) | 83% | very high |
| May Weather | 19°C (66°F) | 149 mm (5.9 inches) | 80% | very high |
| June Weather | 24°C (75°F) | 112 mm (4.4 inches) | 83% | extreme |
| July Weather | 25°C (78°F) | 114 mm (4.5 inches) | 82% | extreme |
| August Weather | 23°C (74°F) | 101 mm (4.0 inches) | 82% | very high |
| September Weather | 21°C (71°F) | 71 mm (2.8 inches) | 79% | very high |
| October Weather | 14°C (58°F) | 120 mm (4.7 inches) | 79% | high |
| November Weather | 5°C (42°F) | 76 mm (3.0 inches) | 88% | moderate |
| December Weather | 2°C (36°F) | 53 mm (2.1 inches) | 87% | moderate |