Wisconsin Dells, WI weather in September
Wisconsin Dells is mild in September, with some rain: highs average 73°F and nights drop to about 49°F. Rain falls on about 9 days. A good month for most outdoor plans.
- Normal high
- 73°F
- Normal low
- 49°F
- Wet days
- 9
- 3.8 in total
- Muggy days
- 2
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 78°F | 67°F |
| Normal low | 54°F | 43°F |
| Chance of a wet day | 31% | 32% |
| Sunrise / sunset | 6:22 am / 7:35 pm | 6:55 am / 6:42 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 am55°Fdew point 51°F
- 9 am64°Fdew point 54°F
- Noon70°Fdew point 53°F
- 3 pm71°Fdew point 53°F
- 6 pm66°Fdew point 54°F
- 9 pm60°Fdew point 54°F
NOAA hourly normals (local standard time) from Madison Dane Rgnl Airport (40 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F14 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more2 of 30
- Wet daysat least 0.01 in of rain or melted snow9 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below1 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 3.8 in; a dry September brings about 1.9 in and a wet one about 5.2 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, 1991-20202015: average high 79°F
- Coolest September1993: average high 64°F
- Wettest September2016: 12.4 in
- Driest September2004: 0.1 in
- Highest reading94°F (September 2, 2011)
- Lowest reading25°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 | 81°F | 73°F | 60°F |
| Normal low | 57°F | 49°F | 37°F |
| Wet days | 10 | 9 | 10 |
| Comfortable days | 9 | 14 | 9 |
| Daylight | 13.9 h | 12.5 h | 11.0 h |
Highs change by -8°F from August and -13°F into October.
Nearby alternatives in September
- Warmer: Peoria, IL203 mi · high 78°F · 8 wet days
- Cooler: Sister Bay, WI169 mi · high 68°F · 10 wet days
How Wisconsin Dells ranks in September
- Normal high318th warmest of 378 cities; 2nd of 5 in Wisconsin
- Wet days282nd driest of 378
- Comfortable days98th most of 342
What to pack for Wisconsin Dells in September
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 175 heating degree days and 50 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Wisconsin Dells in September?
The normal high is 73°F and the normal low is 49°F. From 1991 to 2020 the hottest September reading was 94°F (most recently on September 2, 2011).
Does it rain a lot in Wisconsin Dells in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 3.8 in. The wettest September in 1991-2020 was in 2016 (12.4 in); the driest was in 2004 (0.1 in).
Is September a good time to visit Wisconsin Dells?
September ranks 3rd of 12 months on our comfort score for Wisconsin Dells (67 out of 100). It has about 14 comfortable days and about 1 day at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Wisconsin Dells (USC00479319), 1.3 mi S of the city center, 835 ft (76 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Madison Dane Rgnl Airport (USW00014837), 40 mi SSE of the city center, 866 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Dane Co Regional-Truax Field Airport (726410-14837), 40 mi SSE of the city center, 859 ft (52 ft lower than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).