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September Weather in Redwood Falls, United States

Last updated: June 24, 2025

In September, the average temperature in Redwood Falls, United States hovers around 18°C (65°F). Expect temperature variations, with a chilly minimum of 1°C (35°F) and a warm maximum reaching up to 33°C (92°F). Be prepared for some damp days, as the area sees an average precipitation of 115 mm (4.5 in) over approximately 9 days, all while maintaining an average humidity of 82%.

September Temperature in Redwood Falls

In September in Redwood Falls, the average temperature is 18°C (65°F), with maximums that can reach 33°C (92°F) and minimums that can dip as low as 1°C (35°F). This makes it a great time to explore, so be sure to pack for both warm days and cooler evenings!

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

The chart illustrates September temperature patterns in Redwood Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Redwood Falls, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (92°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec161633435972747164483424
Data source: Temperature data for Redwood 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 Redwood Falls

In Redwood Falls in September, the precipitation amount is 115 mm (4.5 in) over the course of 9 days, indicating a relatively wet period for the region.

September Precipitation Trends in Redwood Falls

The chart displays monthly precipitation patterns in Redwood 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 Redwood Falls, September typically receives around 115 mm (4.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec25266281120103118124115953040
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Redwood Falls

In Redwood Falls in September, humidity is 82%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace that can quickly leave travelers feeling fatigued and in need of frequent breaks to stay refreshed and hydrated.

September Average Humidity in Redwood Falls

This chart illustrates the average monthly humidity levels in Redwood 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 Redwood Falls is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%89%81%82%76%81%82%83%82%82%87%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Redwood Falls

In Redwood Falls 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 Redwood Falls.

Maximum UV Index Levels in Redwood Falls for September

The chart shows the monthly maximum UV Index (UVI) for Redwood 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 Redwood Falls typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3558910998532
Data source: Redwood 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 Redwood Falls Compares to Other Months

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

This table compares monthly weather conditions in Redwood Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (17°F)25 mm (1.0 inches)85%moderate
February Weather-9°C (16°F)26 mm (1.0 inches)89%moderate
March Weather0°C (33°F)62 mm (2.5 inches)81%moderate
April Weather6°C (43°F)81 mm (3.2 inches)82%very high
May Weather15°C (60°F)120 mm (4.7 inches)76%very high
June Weather22°C (72°F)103 mm (4.1 inches)81%very high
July Weather23°C (74°F)118 mm (4.7 inches)82%very high
August Weather21°C (71°F)124 mm (4.9 inches)83%very high
September Weather18°C (65°F)115 mm (4.5 inches)82%very high
October Weather9°C (48°F)95 mm (3.8 inches)82%moderate
November Weather1°C (34°F)29 mm (1.2 inches)87%moderate
December Weather-4°C (24°F)40 mm (1.6 inches)84%low

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