Milwaukee, WI weather in September
September in Milwaukee: mild, with some rain. Highs 74°F, lows 56°F, about 9 wet days. A good month for most outdoor plans.
- Normal high
- 74°F
- Normal low
- 56°F
- Wet days
- 9
- 3.2 in total
- Muggy days
- 3
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 78°F | 68°F |
| Normal low | 62°F | 51°F |
| Chance of a wet day | 28% | 31% |
| Sunrise / sunset | 6:16 am / 7:27 pm | 6:47 am / 6:35 pm |
| Daylight | 13.2 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical September day
- 6 am59°Fdew point 53°F
- 9 am66°Fdew point 55°F
- Noon70°Fdew point 55°F
- 3 pm70°Fdew point 54°F
- 6 pm66°Fdew point 54°F
- 9 pm63°Fdew point 54°F
NOAA hourly normals (local standard time) from Milwaukee Mitchell Airport (6 mi away); average wind 9 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F14 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph4 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more3 of 30
- Wet daysat least 0.01 in of rain or melted snow9 of 30
- Notable rainat least 0.10 in5 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 3.2 in; a dry September brings about 1.7 in and a wet one about 4.2 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202005: average high 78°F
- Coolest September1993: average high 68°F
- Wettest September2000: 7.0 in
- Driest September2004: 0.2 in
- Highest reading95°F (September 22, 2017)
- Lowest reading32°F (September 23, 1995)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 80°F | 74°F | 61°F |
| Normal low | 64°F | 56°F | 45°F |
| Wet days | 10 | 9 | 10 |
| Comfortable days | 10 | 14 | 9 |
| Daylight | 13.9 h | 12.5 h | 11.0 h |
Highs change by -6°F from August and -13°F into October.
Nearby alternatives in September
- Warmer: Springfield, IL241 mi · high 80°F · 7 wet days
- Cooler: Sister Bay, WI153 mi · high 68°F · 10 wet days
How Milwaukee ranks in September
- Normal high311th warmest of 378 cities; 1st of 5 in Wisconsin
- Wet days226th driest of 378
- Comfortable days97th most of 342
What to pack for Milwaukee in September
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 94 heating degree days and 93 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Milwaukee in September?
The normal high is 74°F and the normal low is 56°F. From 1991 to 2020 the hottest September reading was 95°F (most recently on September 22, 2017).
Does it rain a lot in Milwaukee in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 3.2 in. The wettest September in 1991-2020 was in 2000 (7.0 in); the driest was in 2004 (0.2 in).
Is September a good time to visit Milwaukee?
September ranks 3rd of 12 months on our comfort score for Milwaukee (68 out of 100). It has about 14 comfortable days and about 1 day at 90°F or hotter. The best months are May, June and September.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates and humidity and wind by hour: Milwaukee Mitchell Airport (USW00014839), 5.8 mi S of the city center, 670 ft (55 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: General Mitchell International Airport (726400-14839), 5.8 mi S of the city center, 667 ft (52 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).