Milwaukee weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: June – September
What is the weather like in Milwaukee in September?
In September, Milwaukee is warm: daytime highs average 21 °C, and nights cool down to about 17 °C. The sun shines for around 7 hours a day. Rain falls on about 9 days, adding up to 74 mm. All in all, September is an excellent month for a holiday in Milwaukee.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 82 | 82 | 57 |
| Day | 24° | 21° | 14° |
| Night | 20° | 17° | 10° |
| Sun | 8 h | 7 h | 5 h |
| Rain days | 10 | 9 | 9 |
More details for September
- Daylight
- 12 h 34 min06:30 – 19:04
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 5 daysdew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 47 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−5America/Chicago
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %62 %
- Few rainy daysweight 30 %66 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Rain jacket or umbrella
Milwaukee in September: quick answers
Is Milwaukee hot in September?
Warm rather than hot: in September, daytime highs in Milwaukee average 21 °C and nights cool to about 17 °C.
Does it rain much in Milwaukee in September?
Rain falls on about 9 days, adding up to 74 mm.
Milwaukee month by month
The whole year in MilwaukeeAll destinations: USAWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences