Last updated: June 24, 2025
In Lake Mills, United States, the average temperature in September hovers around 18°C (65°F), offering a pleasant climate. However, you may experience a minimum of 3°C (37°F) and a maximum of 33°C (92°F), showcasing significant variability. Be prepared for occasional rain, as 108 mm (4.2 in) of precipitation usually falls over 10 days of the month. The average humidity is a comfortable 75%, adding to the overall charm of the season.
In September in Lake Mills, the average temperature is 18°C (65°F), with maximums that can reach 33°C (92°F) and minimums that can drop to as low as 3°C (37°F). Overall, travelers should be prepared for a range of temperatures, ensuring they pack both warm clothing for the cooler evenings and lighter attire for the hotter days.
In Lake Mills in September, the precipitation amount is 108 mm (4.2 in) distributed over a duration of 10 days.
In Lake Mills in September, humidity is 75%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket that can make outdoor exploration feel a bit stifling, potentially leading to discomfort during travel activities.
In Lake Mills 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 Lake Mills.
UV Risk Categories
Weather in Lake Mills varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Lake Mills, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 35 mm (1.4 inches) | 82% | moderate |
| February Weather | -8°C (17°F) | 47 mm (1.8 inches) | 84% | moderate |
| March Weather | 1°C (34°F) | 72 mm (2.8 inches) | 80% | moderate |
| April Weather | 7°C (45°F) | 85 mm (3.3 inches) | 81% | very high |
| May Weather | 15°C (60°F) | 152 mm (6.0 inches) | 74% | very high |
| June Weather | 22°C (72°F) | 139 mm (5.5 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 100 mm (4.0 inches) | 80% | very high |
| August Weather | 21°C (70°F) | 114 mm (4.5 inches) | 77% | very high |
| September Weather | 18°C (65°F) | 108 mm (4.2 inches) | 75% | very high |
| October Weather | 9°C (49°F) | 104 mm (4.1 inches) | 80% | moderate |
| November Weather | 1°C (35°F) | 45 mm (1.8 inches) | 87% | moderate |
| December Weather | -3°C (26°F) | 38 mm (1.5 inches) | 83% | moderate |