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September Weather in Winterset, United States

Last updated: June 24, 2025

The average temperature in Winterset, United States during September hovers around 20°C (69°F). Expect a minimum of 6°C (42°F) and a maximum of 33°C (92°F). Be prepared for some rainfall, as the region typically experiences about 117 mm (4.6 in) of precipitation spread over 9 days. With an average humidity of 73%, you might want to pack accordingly for the warmer and wetter days ahead!

September Temperature in Winterset

In September in Winterset, the average temperature is 20°C (69°F), with maximums reaching up to 33°C (92°F) and minimums dropping as low as 6°C (42°F). This variation in temperature makes it important for travelers to prepare for both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Winterset, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Winterset, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec232540506275777468533931
Data source: Temperature data for Winterset 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 Winterset

In Winterset in September, the total precipitation amount is 117 mm (4.6 in) spread over a period of 9 days.

September Precipitation Trends in Winterset

The chart displays monthly precipitation patterns in Winterset, 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 Winterset, September typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec3938856717111567841171323939
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Winterset

In Winterset in September humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Winterset

This chart illustrates the average monthly humidity levels in Winterset, 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 Winterset is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Winterset

In Winterset 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 Winterset.

Maximum UV Index Levels in Winterset for September

The chart shows the monthly maximum UV Index (UVI) for Winterset 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 Winterset typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810111098643
Data source: Winterset 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 Winterset Compares to Other Months

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

This table compares monthly weather conditions in Winterset, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)39 mm (1.5 inches)78%moderate
February Weather-4°C (25°F)38 mm (1.5 inches)80%moderate
March Weather5°C (41°F)84 mm (3.3 inches)77%high
April Weather10°C (50°F)67 mm (2.6 inches)77%very high
May Weather17°C (63°F)171 mm (6.7 inches)77%very high
June Weather24°C (75°F)115 mm (4.5 inches)81%extreme
July Weather25°C (78°F)67 mm (2.6 inches)81%very high
August Weather23°C (74°F)84 mm (3.3 inches)77%very high
September Weather20°C (69°F)117 mm (4.6 inches)73%very high
October Weather11°C (53°F)132 mm (5.2 inches)75%high
November Weather4°C (39°F)39 mm (1.5 inches)85%moderate
December Weather0°C (32°F)39 mm (1.5 inches)83%moderate

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