Weather in Milwaukee in September 2025
Average weather
Average temperature in Milwaukee in September
Going from a maximum of +95°F during the day to a minimum of +46°F during the night, the temperature in September averages around +75°F.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +81°F to +81°F.
Is Milwaukee warm or cold in September?
Milwaukee is typically mild in September.
Maximum temperatures go down compared to the previous month from +79°F to +72°F. The minimum temperature also goes down from +66°F to +59°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Milwaukee:
Climate in Milwaukee in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +79°F | +72°F | +59°F | ||||
| Min. temperature | ||||||
| +48°F | +36°F | +25°F | ||||
| Max. temperature | ||||||
| +99°F | +95°F | +84°F | ||||
| Rainfall | ||||||
| 112 mm | 90 mm | 79 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 4 m/s | ||||
| Humidity | ||||||
| 72% | 72% | 70% | ||||
| Air pressure | ||||||
| 1015 HPa | 1016 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 5 | 7 | 5 | ||||
| Cloudy days | ||||||
| 9 | 9 | 11 | ||||
| Rainy days | ||||||
| 16 | 14 | 14 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting colder in September. From +79°F in the day, the average maximum temperature lowers to +72°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 112 mm to 90 mm. Humidity levels don’t change as the month goes on, averaging around 72%. The average wind speed doesn’t change much during September, staying around 3 m/s. The good news is there are likely to be more sunny days in September, from 5 to 7.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Milwaukee is gradually increasing during September, going from 2 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Milwaukee?
Climate Change Over the Years
The climate in Milwaukee in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1996 (+51°F) and the highest in 2012 (+61°F). The driest year was 2005 with only 615 mm of rainfall, and the wettest year was 2024 with 1292 mm.
FAQ
Is September a good time to visit Milwaukee?
Can you sunbathe in Milwaukee in September?
Is Milwaukee rainy in September?
Is it sunny in Milwaukee in September?
Other cities in USA
Monthly weather in Milwaukee
Source of the data
For this page, we’ve looked at the typical weather in Milwaukee, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
