Winona Weather in May

The climate in Winona during May can be summarized as warm, humid and wet.

May is in the spring in Winona and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (82°F), whilst at night 15°C (59°F) is normal.

On average May is the 5th wettest month of the year in Winona with around 129mm 5.1 inches of rain making it a wet time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.5 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Winona in May 2025.