September Weather in Winona, United States

Last updated: June 24, 2025

In September, the average temperature in Winona, United States hovers around 23°C (73°F), with a minimum dip to 7°C (46°F) and a maximum climb to 35°C (96°F). Expect about 58 mm (2.3 in) of precipitation spread over 6 days, while the average humidity settles at a comfortable 68%.

September Temperature in Winona

In September in Winona, the average temperature is a pleasant 23°C (73°F). Maximum temperatures can reach up to 35°C (96°F), while minimum temperatures can drop as low as 7°C (46°F). This variation makes it essential for travelers to pack versatile clothing to enjoy both warm days and 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 23°C (73°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (46°F).

Data source: Temperature data for Winona generated using information from the Copernicus Climate Change Service.

September Precipitation in Winona

In Winona in September, the precipitation amount is 58 mm (2.3 in) over the course of 6 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 58 mm (2.3 inches) of precipitation spread over approximately 6 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Winona

In Winona in September humidity is 68%. With an average temperature of 23°C (73°F), this humidity feels like a soft blanket wrapping around you, making every step outside feel a bit heavier, but offering a warm embrace that encourages leisurely exploration and a relaxed pace for 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 68%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	82 mm (3.2 inches)	83%	moderate
February Weather	4°C (39°F)	107 mm (4.2 inches)	81%	high
March Weather	10°C (50°F)	150 mm (5.9 inches)	80%	high
April Weather	13°C (56°F)	160 mm (6.3 inches)	80%	very high
May Weather	19°C (67°F)	180 mm (7.1 inches)	83%	very high
June Weather	24°C (75°F)	87 mm (3.4 inches)	83%	extreme
July Weather	26°C (80°F)	86 mm (3.4 inches)	76%	extreme
August Weather	25°C (77°F)	104 mm (4.1 inches)	69%	very high
September Weather	23°C (73°F)	58 mm (2.3 inches)	68%	very high
October Weather	15°C (60°F)	121 mm (4.8 inches)	72%	high
November Weather	8°C (46°F)	76 mm (3.0 inches)	83%	moderate
December Weather	5°C (42°F)	76 mm (3.0 inches)	86%	moderate