Last updated: June 24, 2025
In September, the average temperature in Knox, United States hovers around 18°C (65°F). Expect a minimum of 2°C (36°F) and a peak of 32°C (89°F), providing a wide range for weather enthusiasts. Precipitation during this time averages 126 mm (4.9 in) over 11 days, while humidity remains at a steady 67%. Prepare accordingly for both warmth and occasional showers!
In September in Knox, the average temperature is 18°C (65°F). Maximum temperatures can reach 32°C (89°F), while minimums can dip as low as 2°C (36°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack layers for comfort during the day and evening.
In Knox in September, the precipitation amount is 126 mm (4.9 in) over the course of 11 days.
In Knox in September humidity is 67%. With an average temperature of 18°C (65°F), this humidity feels like a mild blanket wrapping around you, making outdoor activities feel pleasantly refreshing, yet you may find yourself reaching for a drink more often to stay hydrated while exploring the sights.
In Knox 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 Knox.
UV Risk Categories
Weather in Knox varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Knox, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (28°F) | 101 mm (4.0 inches) | 89% | moderate |
| February Weather | -1°C (31°F) | 115 mm (4.5 inches) | 90% | moderate |
| March Weather | 3°C (38°F) | 108 mm (4.2 inches) | 89% | high |
| April Weather | 9°C (48°F) | 136 mm (5.3 inches) | 88% | very high |
| May Weather | 15°C (60°F) | 152 mm (6.0 inches) | 80% | very high |
| June Weather | 20°C (68°F) | 143 mm (5.6 inches) | 79% | very high |
| July Weather | 22°C (72°F) | 150 mm (5.9 inches) | 74% | very high |
| August Weather | 21°C (70°F) | 112 mm (4.4 inches) | 64% | very high |
| September Weather | 18°C (65°F) | 126 mm (4.9 inches) | 67% | very high |
| October Weather | 12°C (54°F) | 131 mm (5.2 inches) | 81% | high |
| November Weather | 4°C (39°F) | 103 mm (4.1 inches) | 89% | moderate |
| December Weather | 1°C (33°F) | 104 mm (4.1 inches) | 88% | low |