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September Weather in Winona, United States

Last updated: June 24, 2025

In September, the average temperature in Winona, United States reaches a pleasant 26°C (79°F). However, temperatures can fluctuate, with a minimum of 10°C (51°F) and a sweltering maximum of 39°C (102°F). Expect around 98 mm (3.9 in) of precipitation spread across 9 days, contributing to an average humidity of 65% for a truly tropical feel.

September Temperature in Winona

In September in Winona, the average temperature is 26°C (79°F). The maximum can reach 39°C (102°F), while the minimum can drop to as low as 10°C (51°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack both light clothing for warmth and layers for cooler evenings.

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

The chart illustrates September temperature patterns in Winona, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Winona, 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 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec485060657481848479685752
Data source: Temperature data for Winona 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 Winona

In Winona in September, the precipitation amount is 98 mm (3.9 in) spread over a duration of 9 days.

September Precipitation Trends in Winona

The chart displays monthly precipitation patterns in Winona, 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 Winona, September typically receives around 98 mm (3.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec11015012914516010986769810469120
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Winona

In Winona in September, humidity is 65%. With an average temperature of 26°C (79°F), this humidity feels like a warm, enveloping blanket, making travel quite sticky and uncomfortable.

September Average Humidity in Winona

This chart illustrates the average monthly humidity levels in Winona, 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 Winona is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Winona

In Winona 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 Winona.

Maximum UV Index Levels in Winona for September

The chart shows the monthly maximum UV Index (UVI) for Winona 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 Winona typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111111110864
Data source: Winona 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 Winona Compares to Other Months

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

This table compares monthly weather conditions in Winona, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)110 mm (4.3 inches)80%moderate
February Weather10°C (50°F)150 mm (5.9 inches)79%high
March Weather16°C (61°F)129 mm (5.1 inches)78%very high
April Weather18°C (65°F)145 mm (5.7 inches)78%very high
May Weather23°C (74°F)160 mm (6.3 inches)81%extreme
June Weather27°C (81°F)109 mm (4.3 inches)78%extreme
July Weather29°C (84°F)86 mm (3.4 inches)73%extreme
August Weather29°C (84°F)75 mm (3.0 inches)66%extreme
September Weather26°C (79°F)98 mm (3.9 inches)65%very high
October Weather20°C (69°F)104 mm (4.1 inches)72%very high
November Weather14°C (57°F)69 mm (2.7 inches)82%high
December Weather11°C (53°F)120 mm (4.7 inches)87%moderate

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