Last updated: June 24, 2025
The average temperature in Decatur, United States during September is a pleasant 24°C (75°F). Expect a minimum of 10°C (50°F) and a soaring maximum of 37°C (100°F). Be prepared for some rain, as precipitation averages 93 mm (3.7 in) over 9 days, coupled with a humidity level of 76%.
In September in Decatur, the average temperature is 24°C (75°F), with maximums reaching up to 37°C (100°F) and minimums dropping as low as 10°C (50°F). Travelers should be prepared for warm days and cooler nights, making it ideal to pack layers for varying temperatures.
In Decatur in September, the precipitation amount is 93 mm (3.7 in) over the course of 9 days.
In Decatur in September, humidity is 76%. With an average temperature of 24°C (75°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities feel a bit sluggish and urging you to seek shade and hydration.
In Decatur 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 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 | 6°C (43°F) | 98 mm (3.8 inches) | 86% | moderate |
February Weather | 9°C (48°F) | 173 mm (6.8 inches) | 86% | high |
March Weather | 12°C (54°F) | 162 mm (6.4 inches) | 86% | very high |
April Weather | 16°C (61°F) | 152 mm (6.0 inches) | 82% | very high |
May Weather | 21°C (71°F) | 120 mm (4.7 inches) | 85% | extreme |
June Weather | 24°C (76°F) | 104 mm (4.1 inches) | 85% | extreme |
July Weather | 27°C (80°F) | 108 mm (4.2 inches) | 83% | extreme |
August Weather | 26°C (79°F) | 114 mm (4.5 inches) | 76% | very high |
September Weather | 24°C (75°F) | 93 mm (3.7 inches) | 76% | very high |
October Weather | 18°C (65°F) | 124 mm (4.9 inches) | 80% | high |
November Weather | 10°C (51°F) | 78 mm (3.1 inches) | 88% | moderate |
December Weather | 8°C (47°F) | 133 mm (5.2 inches) | 88% | moderate |