Last updated: June 24, 2025
The average temperature in La Crosse, United States during September is a comfortable 20°C (69°F). Expect minimums as low as 4°C (40°F) and maximums reaching 34°C (93°F). Prepare for some rainfall, with an average precipitation of 71 mm (2.8 in) spread over 9 days. Don't forget, the humidity levels are typically around 78%, making the air feel quite warm and inviting!
In September in La Crosse, the average temperature is a pleasant 20°C (69°F). Maximum temperatures can reach as high as 34°C (93°F), while the minimum can dip down to 4°C (40°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities while being prepared for both warm and cool conditions.
In La Crosse in September, the precipitation amount is 71 mm (2.8 in) spread over 9 days.
In La Crosse in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.
In La Crosse 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 La Crosse.
UV Risk Categories
Weather in La Crosse varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in La Crosse, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (28°F) | 73 mm (2.9 inches) | 85% | moderate |
| February Weather | -2°C (30°F) | 74 mm (2.9 inches) | 85% | moderate |
| March Weather | 5°C (41°F) | 103 mm (4.0 inches) | 86% | high |
| April Weather | 10°C (50°F) | 110 mm (4.3 inches) | 87% | very high |
| May Weather | 17°C (63°F) | 170 mm (6.7 inches) | 81% | very high |
| June Weather | 23°C (73°F) | 117 mm (4.6 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 113 mm (4.5 inches) | 81% | very high |
| August Weather | 23°C (74°F) | 106 mm (4.2 inches) | 79% | very high |
| September Weather | 20°C (69°F) | 71 mm (2.8 inches) | 78% | very high |
| October Weather | 13°C (56°F) | 126 mm (5.0 inches) | 81% | high |
| November Weather | 5°C (41°F) | 70 mm (2.7 inches) | 89% | moderate |
| December Weather | 1°C (34°F) | 59 mm (2.3 inches) | 86% | low |