nomadseason

September Weather in Winona, United States

Last updated: June 24, 2025

In Winona, United States, the average temperature for September hovers around 25°C (78°F). Visitors can expect a range from a cool 10°C (51°F) to a scorching 38°C (101°F). The weather brings about 93 mm (3.7 in) of precipitation over 9 days, contributing to an average humidity of 74%. Prepare accordingly for this mix of warmth and moisture!

September Temperature in Winona

In September in Winona, the average temperature is 25°C (78°F). Maximums can reach 38°C (101°F) and minimums can be as low as 10°C (51°F). This makes it an ideal time for travelers to enjoy both warm days and cool evenings while exploring all that Winona has to offer.

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 25°C (78°F), with highs reaching up to 38°C (101°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec465159637379828177675350
Data source: Temperature data for Winona generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 93 mm (3.7 in) over the course 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 93 mm (3.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec119183162151114127951209312680125
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Winona

In Winona in September humidity is 74%. With an average temperature of 25°C (78°F), this humidity feels like you're enveloped in a warm, thick blanket, making outdoor activities feel more strenuous and necessitating frequent breaks and hydration for comfortable travel.

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 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
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 is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
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 Weather8°C (46°F)119 mm (4.7 inches)85%moderate
February Weather10°C (51°F)183 mm (7.2 inches)84%high
March Weather15°C (59°F)162 mm (6.4 inches)82%very high
April Weather17°C (63°F)151 mm (5.9 inches)82%very high
May Weather23°C (73°F)114 mm (4.5 inches)82%extreme
June Weather26°C (79°F)127 mm (5.0 inches)79%extreme
July Weather28°C (82°F)94 mm (3.7 inches)82%extreme
August Weather27°C (81°F)120 mm (4.7 inches)77%extreme
September Weather25°C (78°F)93 mm (3.7 inches)74%very high
October Weather19°C (67°F)126 mm (5.0 inches)73%very high
November Weather12°C (53°F)80 mm (3.1 inches)85%high
December Weather10°C (50°F)125 mm (4.9 inches)88%moderate

Compare Winona's Climate with Cities Worldwide