Sister Bay, WI weather in September
In September, Sister Bay sees highs around 68°F and lows around 51°F: mild, with some rain. Expect about 10 wet days. Great for outdoor plans.
- Normal high
- 68°F
- Normal low
- 51°F
- Wet days
- 10
- 3.2 in total
- Daylight
- 12.5 h
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 73°F | 62°F |
| Normal low | 55°F | 46°F |
| Chance of a wet day | 32% | 36% |
| Sunrise / sunset | 6:10 am / 7:26 pm | 6:45 am / 6:31 pm |
| Daylight | 13.3 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).
What kind of days to expect
- Comfortable dayshigh 65-80°F (temperature only: no humidity station nearby)19 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain (temperature and rain only)1 of 30
- Hot dayshigh 90°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow10 of 30
- Notable rainat least 0.10 in6 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 2.2 in and a wet one about 3.9 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, 1991-20201998: average high 73°F
- Coolest September1992: average high 63°F
- Wettest September2019: 8.2 in
- Driest September2009: 0.6 in
- Highest reading86°F (September 6, 2007)
- Lowest reading30°F (September 28, 1991)
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 | 75°F | 68°F | 55°F |
| Normal low | 57°F | 51°F | 40°F |
| Wet days | 9 | 10 | 12 |
| Comfortable days | 26 | 19 | 3 |
| Daylight | 14.0 h | 12.5 h | 10.9 h |
Highs change by -7°F from August and -13°F into October.
Nearby alternatives in September
- Warmer: Milwaukee, WI153 mi · high 74°F · 9 wet days
How Sister Bay ranks in September
- Normal high363rd warmest of 378 cities; 5th of 5 in Wisconsin
- Wet days304th driest of 378
What to pack for Sister Bay in September
- A rain jacket or umbrella – rain on about 10 days
Heating and cooling
September has 194 heating degree days and 22 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How cold is Sister Bay in September?
The normal high is 68°F and the normal low is 51°F. From 1991 to 2020 the coldest September reading was 30°F (September 28, 1991).
Does it rain a lot in Sister Bay in September?
About 10 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 2019 (8.2 in); the driest was in 2009 (0.6 in).
Is September a good time to visit Sister Bay?
September ranks 4th of 12 months on our comfort score for Sister Bay (74 out of 100). It has about 19 comfortable days (judged by temperature only). The best months are June, July and August.
Where the numbers come from
- Temperature, rain and snowfall: Washington Is (USC00478905), 16 mi NE of the city center, 686 ft (73 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Snow depth: Sturgeon Bay Exp Farm (USC00478267), 24 mi SSW of the city center, 699 ft (86 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Ephraim 1NE-Wwtp (USC00472626), 2.0 mi SW of the city center, 733 ft (120 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: humidity and wind by hour, cloud cover and daily humidity and wind (no station close enough or similar enough in elevation).