September Weather in Trempealeau, United States

Last updated: June 24, 2025

The average temperature in Trempealeau, United States during September is a pleasant 18°C (64°F). Expect minimums of 3°C (37°F) and maximums reaching up to 33°C (91°F). This month also sees about 116 mm (4.5 in) of precipitation spread over 9 days, resulting in a comfortable average humidity level of 74%.

September Temperature in Trempealeau

In September in Trempealeau, the average temperature is 18°C (64°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 3°C (37°F). Travelers should be prepared for a wide range of temperatures, making layering an essential strategy for comfort during their visit.

September Weather in Trempealeau: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Trempealeau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trempealeau, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (37°F).

Data source: Temperature data for Trempealeau generated using information from the Copernicus Climate Change Service.

September Precipitation in Trempealeau

In Trempealeau in September, the precipitation amount is 116 mm (4.5 in) over the course of 9 days.

September Precipitation Trends in Trempealeau

The chart displays monthly precipitation patterns in Trempealeau, 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 Trempealeau, September typically receives around 116 mm (4.5 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Trempealeau

In Trempealeau in September humidity is 74%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls but potentially uncomfortable for extended outdoor activities.

September Average Humidity in Trempealeau

This chart illustrates the average monthly humidity levels in Trempealeau, 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 Trempealeau is approximately 74%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Trempealeau

In Trempealeau 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 Trempealeau.

Maximum UV Index Levels in Trempealeau for September

The chart shows the monthly maximum UV Index (UVI) for Trempealeau 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 Trempealeau typically reaches 8, which falls under the very high exposure category.

Data source: Trempealeau 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 Trempealeau Compares to Other Months

Weather in Trempealeau varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Trempealeau, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Trempealeau, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (19°F)	35 mm (1.4 inches)	84%	low
February Weather	-7°C (20°F)	49 mm (1.9 inches)	85%	moderate
March Weather	2°C (35°F)	57 mm (2.3 inches)	84%	moderate
April Weather	7°C (45°F)	87 mm (3.4 inches)	83%	very high
May Weather	15°C (59°F)	149 mm (5.9 inches)	75%	very high
June Weather	21°C (71°F)	156 mm (6.2 inches)	79%	very high
July Weather	23°C (74°F)	106 mm (4.2 inches)	75%	very high
August Weather	21°C (70°F)	131 mm (5.2 inches)	69%	very high
September Weather	18°C (64°F)	116 mm (4.5 inches)	74%	very high
October Weather	10°C (49°F)	120 mm (4.7 inches)	79%	moderate
November Weather	1°C (35°F)	55 mm (2.2 inches)	88%	moderate
December Weather	-3°C (26°F)	43 mm (1.7 inches)	82%	low