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September Weather in River Falls, United States

Last updated: June 24, 2025

In September, the average temperature in River Falls, United States hovers around 26°C (79°F). However, be prepared for a range of temperatures, with a minimum of 12°C (54°F) and soaring up to a maximum of 39°C (102°F). Expect 114 mm (4.5 in) of precipitation spread over 13 days, contributing to an average humidity of 79%. 🌦️

September Temperature in River Falls

In September in River Falls, the average temperature is 26°C (79°F). The maximum can reach 39°C (102°F) and the minimum can be as low as 12°C (54°F). Be prepared for a warm climate, with occasional cool evenings, making it an ideal time for both outdoor activities and relaxation.

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 26°C (79°F), with highs reaching up to 39°C (102°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec515762667479818178715854
Data source: Temperature data for River Falls 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 River Falls

In River Falls in September, the total precipitation amount is 114 mm (4.5 in), distributed over the course of 13 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 114 mm (4.5 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec1001288812312215713214011410456134
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in River Falls

In River Falls in September humidity is 79%. With an average temperature of 26°C (79°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel exhausting. Travelers should be prepared for a heavy air that clings to the skin, making hydration essential while navigating the sights and sounds of the city.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%79%77%74%70%78%78%79%74%83%86%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111111121110864
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.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)100 mm (3.9 inches)83%moderate
February Weather14°C (58°F)128 mm (5.1 inches)82%very high
March Weather17°C (62°F)87 mm (3.4 inches)79%very high
April Weather19°C (67°F)123 mm (4.8 inches)77%extreme
May Weather24°C (75°F)122 mm (4.8 inches)74%extreme
June Weather26°C (79°F)157 mm (6.2 inches)70%extreme
July Weather27°C (81°F)132 mm (5.2 inches)78%extreme
August Weather27°C (81°F)140 mm (5.5 inches)78%extreme
September Weather26°C (79°F)114 mm (4.5 inches)79%very high
October Weather22°C (71°F)104 mm (4.1 inches)74%very high
November Weather14°C (58°F)56 mm (2.2 inches)83%high
December Weather12°C (54°F)134 mm (5.3 inches)86%moderate

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