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September Weather in La Crosse, United States

Last updated: June 24, 2025

The average temperature in La Crosse, United States during September is a comfortable 22°C (72°F), with temperatures ranging from a chilly 4°C (40°F) to a sizzling 38°C (101°F). Expect precipitation averages of 58 mm (2.3 in) spread across 6 rainy days, complemented by an average humidity level of 73%.

September Temperature in La Crosse

In September in La Crosse, the average temperature is 22°C (72°F). Maximum temperatures can reach 38°C (101°F), while minimums can drop as low as 4°C (40°F). This wide range of temperatures makes it essential for travelers to pack accordingly, ensuring comfort for both warm and cooler moments.

September Weather in La Crosse: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in La Crosse, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In La Crosse, September typically has an average temperature of 22°C (72°F), with highs reaching up to 38°C (101°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec313245536477817772554436
Data source: Temperature data for La Crosse generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in La Crosse

In La Crosse in September, the precipitation amount is 58 mm (2.3 in) over the course of 6 days.

September Precipitation Trends in La Crosse

The chart displays monthly precipitation patterns in La Crosse, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In La Crosse, September typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec2420694413856677258672529
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in La Crosse

In La Crosse in September, humidity is 73%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace that can make outdoor activities feel sticky and heavy, so it's best to stay hydrated and take frequent breaks while exploring.

September Average Humidity in La Crosse

This chart illustrates the average monthly humidity levels in La Crosse, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in La Crosse is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%78%67%70%82%81%80%80%74%71%79%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in La Crosse

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.

Maximum UV Index Levels in La Crosse for September

The chart shows the monthly maximum UV Index (UVI) for La Crosse in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in La Crosse typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4579101111109743
Data source: La Crosse September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in La Crosse Compares to Other Months

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.

This table compares monthly weather conditions in La Crosse, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)24 mm (0.9 inches)74%moderate
February Weather0°C (33°F)20 mm (0.8 inches)78%moderate
March Weather7°C (46°F)69 mm (2.7 inches)67%high
April Weather12°C (54°F)44 mm (1.7 inches)70%very high
May Weather18°C (64°F)138 mm (5.4 inches)82%very high
June Weather25°C (77°F)56 mm (2.2 inches)81%extreme
July Weather27°C (81°F)67 mm (2.6 inches)80%extreme
August Weather25°C (78°F)72 mm (2.8 inches)80%very high
September Weather22°C (72°F)58 mm (2.3 inches)73%very high
October Weather13°C (56°F)67 mm (2.6 inches)71%high
November Weather7°C (44°F)25 mm (1.0 inches)79%moderate
December Weather2°C (36°F)29 mm (1.1 inches)83%moderate

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