Last updated: June 24, 2025
In September, the average temperature in La Crosse, United States is a pleasant 23°C (74°F). Expect temperatures to range from a refreshing 8°C (47°F) to a warm 36°C (97°F). With an average humidity of 75%, you'll likely feel the warmth as well. Don't forget to prepare for some moisture, as 104 mm (4.1 in) of precipitation can be expected over 9 days!
In September in La Crosse, the average temperature is 23°C (74°F). The maximum can reach 36°C (97°F) and the minimum can be as low as 8°C (47°F). This makes it an ideal destination for travelers seeking warm weather, but be prepared for cooler evenings.
In La Crosse in September, the precipitation amount is 104 mm (4.1 in) over the course of 9 days.
In La Crosse in September, humidity is 75%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket wrapping around you, making it feel more sweltering than it actually is, which can be quite uncomfortable for traveling.
In La Crosse in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check 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 | 5°C (42°F) | 83 mm (3.2 inches) | 84% | moderate |
| February Weather | 8°C (47°F) | 104 mm (4.1 inches) | 84% | high |
| March Weather | 11°C (51°F) | 82 mm (3.2 inches) | 84% | high |
| April Weather | 16°C (61°F) | 104 mm (4.1 inches) | 82% | very high |
| May Weather | 21°C (69°F) | 119 mm (4.7 inches) | 82% | very high |
| June Weather | 24°C (76°F) | 120 mm (4.7 inches) | 83% | extreme |
| July Weather | 27°C (80°F) | 101 mm (4.0 inches) | 79% | extreme |
| August Weather | 26°C (78°F) | 142 mm (5.6 inches) | 77% | very high |
| September Weather | 23°C (74°F) | 104 mm (4.1 inches) | 75% | very high |
| October Weather | 18°C (65°F) | 102 mm (4.0 inches) | 81% | very high |
| November Weather | 10°C (51°F) | 79 mm (3.1 inches) | 87% | moderate |
| December Weather | 7°C (45°F) | 98 mm (3.9 inches) | 85% | moderate |