September Weather in River Falls, United States

Last updated: June 24, 2025

In September, the average temperature in River Falls, United States is 18°C (64°F), making it a pleasant time of year. Expect temperatures to vary, with a minimum of 1°C (35°F) and a maximum reaching up to 33°C (91°F). During this month, you can anticipate about 112 mm (4.4 in) of precipitation over approximately 9 days. Additionally, the average humidity sits at a comfortable 81%, adding to the region's unique atmosphere.

September Temperature in River Falls

In September in River Falls, the average temperature is 18°C (64°F). Maximums can reach 33°C (91°F), and minimums can be as low as 1°C (35°F). Travelers should be prepared for a range of temperatures and pack accordingly for both warm days and cooler evenings.

September Weather in River Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in River Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In River Falls, 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 1°C (35°F).

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

September Precipitation in River Falls

In River Falls in September, the total precipitation amount is 112 mm (4.4 in), occurring over a span of 9 days.

September Precipitation Trends in River Falls

The chart displays monthly precipitation patterns in River Falls, 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 River Falls, September typically receives around 112 mm (4.4 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 River Falls

In River Falls in September, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

September Average Humidity in River Falls

This chart illustrates the average monthly humidity levels in River Falls, 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 River Falls is approximately 81%, 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 River Falls

In River Falls in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in River Falls.

Maximum UV Index Levels in River Falls for September

The chart shows the monthly maximum UV Index (UVI) for River Falls 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 River Falls typically reaches 7, which falls under the high exposure category.

Data source: River Falls 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 River Falls Compares to Other Months

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

This table compares monthly weather conditions in River Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (17°F)	32 mm (1.3 inches)	87%	low
February Weather	-8°C (18°F)	42 mm (1.7 inches)	90%	moderate
March Weather	1°C (33°F)	58 mm (2.3 inches)	85%	moderate
April Weather	6°C (44°F)	89 mm (3.5 inches)	84%	high
May Weather	15°C (59°F)	143 mm (5.6 inches)	78%	very high
June Weather	21°C (71°F)	125 mm (4.9 inches)	80%	very high
July Weather	23°C (74°F)	109 mm (4.3 inches)	81%	very high
August Weather	21°C (70°F)	126 mm (5.0 inches)	81%	very high
September Weather	18°C (64°F)	112 mm (4.4 inches)	81%	high
October Weather	9°C (48°F)	104 mm (4.1 inches)	84%	moderate
November Weather	1°C (33°F)	41 mm (1.6 inches)	88%	moderate
December Weather	-5°C (24°F)	53 mm (2.1 inches)	84%	low