Last updated: June 24, 2025
In September, the average temperature in Brainerd, United States is a pleasant 16°C (61°F), making it an ideal time to explore the area. However, temperatures can vary, with minimums dipping to 1°C (34°F) and maximums soaring to 31°C (88°F). Expect about 110 mm (4.3 in) of precipitation spread across 10 days, contributing to an average humidity level of 77%. This unique combination of conditions creates a vibrant, lush environment that invites adventure.
In September in Brainerd, the average temperature is 16°C (61°F). The maximum can reach 31°C (88°F), and the minimum can be as low as 1°C (34°F). Be prepared for a wide range of temperatures to make the most of your travel experience.
In Brainerd in September, the precipitation amount is 110 mm (4.3 in) over a period of 10 days.
In Brainerd in September humidity is 77%. With an average temperature of 16°C (61°F), this humidity feels like a slight heaviness in the air, making every step feel a touch more effortful while traveling. The dampness clings to your skin, adding a layer of discomfort, yet the mild temperature invites you to explore the surroundings, blending the challenge of the humidity with an opportunity for a refreshing adventure.
In Brainerd 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 Brainerd.
UV Risk Categories
Weather in Brainerd varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Brainerd, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -11°C (13°F) | 19 mm (0.8 inches) | 92% | low |
| February Weather | -11°C (13°F) | 24 mm (0.9 inches) | 93% | moderate |
| March Weather | -1°C (30°F) | 40 mm (1.6 inches) | 88% | moderate |
| April Weather | 4°C (40°F) | 64 mm (2.5 inches) | 83% | high |
| May Weather | 13°C (56°F) | 73 mm (2.9 inches) | 76% | very high |
| June Weather | 20°C (69°F) | 83 mm (3.2 inches) | 76% | very high |
| July Weather | 22°C (73°F) | 91 mm (3.6 inches) | 76% | very high |
| August Weather | 20°C (69°F) | 98 mm (3.9 inches) | 77% | very high |
| September Weather | 16°C (61°F) | 110 mm (4.3 inches) | 77% | high |
| October Weather | 7°C (46°F) | 107 mm (4.2 inches) | 82% | moderate |
| November Weather | -1°C (30°F) | 27 mm (1.1 inches) | 87% | moderate |
| December Weather | -7°C (20°F) | 51 mm (2.0 inches) | 89% | low |