Last updated: June 24, 2025
In September, the average temperature in International Falls, United States is a mild 14°C (57°F). However, temperatures can vary significantly, with a minimum of -3°C (27°F) and a maximum soaring to 30°C (86°F). Expect an average precipitation of 138 mm (5.4 in) over about 14 days, accompanied by a notable humidity level of 75%, creating a unique and dynamic climate experience!
In September in International Falls, the average temperature is 14°C (57°F). Maximum temperatures can reach 30°C (86°F), while minimums can drop as low as -3°C (27°F). Be prepared for a wide range of temperatures when traveling to International Falls during this month.
In International Falls in September, the total precipitation amount is 138 mm (5.4 in) over a span of 14 days.
In International Falls in September, humidity is 75%. With an average temperature of 14°C (57°F), this humidity feels like a damp blanket enveloping you, making outdoor activities somewhat uncomfortable and travel a bit sluggish, as the air feels heavy and the heat lingers close to your skin.
In International Falls in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in International Falls.
UV Risk Categories
Weather in International Falls varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in International Falls, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -13°C (8°F) | 24 mm (0.9 inches) | 96% | low |
| February Weather | -14°C (8°F) | 27 mm (1.1 inches) | 95% | moderate |
| March Weather | -3°C (26°F) | 26 mm (1.0 inches) | 92% | moderate |
| April Weather | 3°C (38°F) | 49 mm (1.9 inches) | 85% | high |
| May Weather | 12°C (54°F) | 49 mm (1.9 inches) | 75% | very high |
| June Weather | 18°C (65°F) | 84 mm (3.3 inches) | 71% | very high |
| July Weather | 21°C (70°F) | 75 mm (3.0 inches) | 70% | very high |
| August Weather | 19°C (66°F) | 70 mm (2.7 inches) | 72% | very high |
| September Weather | 14°C (57°F) | 138 mm (5.4 inches) | 75% | high |
| October Weather | 6°C (43°F) | 93 mm (3.6 inches) | 82% | moderate |
| November Weather | -3°C (26°F) | 38 mm (1.5 inches) | 90% | low |
| December Weather | -10°C (15°F) | 43 mm (1.7 inches) | 96% | low |