September weather in Rochester, WI
The average temperature in Rochester in September is 61.8°F (50.0°F–73.6°F). Average precipitation: 3.62 inches.
September is a fall month in Rochester, and is warmer than the annual average of 46.7°F. Daily temperatures swing about 23.6°F between overnight low and afternoon high. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
73.6°F
Avg Low
50.0°F
Precipitation
3.62 in
Daylight
12h 16m
September records in Rochester
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (2012) | 44.1°F (2023) | 0.15 in (2018) |
| September 2 | 91.0°F (2011) | 42.1°F (2017) | 0.37 in (2018) |
| September 3 | 89.1°F (2011) | 46.0°F (2020) | 0.93 in (2018) |
| September 4 | 91.9°F (2018) | 41.0°F (2025) | 1.70 in (2018) |
| September 5 | 91.9°F (2018) | 41.0°F (2025) | 1.15 in (2014) |
| September 6 | 87.1°F (2015) | 42.1°F (2011) | 0.50 in (2018) |
| September 7 | 90.0°F (2016) | 41.0°F (2025) | 0.10 in (2020) |
| September 8 | 84.9°F (2016) | 39.0°F (2025) | 1.02 in (2016) |
| September 9 | 82.0°F (2016) | 39.0°F (2025) | 1.15 in (2015) |
| September 10 | 89.1°F (2013) | 41.0°F (2017) | 1.00 in (2019) |
| September 11 | 91.9°F (2013) | 42.1°F (2017) | 0.25 in (2014) |
| September 12 | 84.9°F (2019) | 41.0°F (2017) | 2.83 in (2022) |
| September 13 | 87.1°F (2024) | 37.9°F (2014) | 2.74 in (2019) |
| September 14 | 86.0°F (2024) | 39.0°F (2013) | 0.28 in (2012) |
| September 15 | 86.0°F (2024) | 35.1°F (2011) | 0.31 in (2013) |
| September 16 | 86.0°F (2024) | 34.0°F (2011) | 0.33 in (2013) |
| September 17 | 89.1°F (2024) | 39.0°F (2011) | 0.87 in (2023) |
| September 18 | 88.0°F (2018) | 37.9°F (2014) | 3.75 in (2015) |
| September 19 | 84.9°F (2024) | 33.1°F (2012) | 0.72 in (2011) |
| September 20 | 88.0°F (2024) | 33.1°F (2012) | 1.00 in (2013) |
| September 21 | 89.1°F (2017) | 41.0°F (2012) | 0.55 in (2018) |
| September 22 | 91.0°F (2017) | 39.0°F (2012) | 0.40 in (2016) |
| September 23 | 93.0°F (2017) | 34.0°F (2012) | 1.15 in (2024) |
| September 24 | 91.9°F (2017) | 32.0°F (2012) | 0.11 in (2024) |
| September 25 | 89.1°F (2017) | 32.0°F (2012) | 1.02 in (2011) |
| September 26 | 88.0°F (2017) | 43.0°F (2013) | 0.62 in (2011) |
| September 27 | 91.0°F (2017) | 36.0°F (2012) | 1.04 in (2011) |
| September 28 | 84.0°F (2021) | 39.9°F (2012) | 0.38 in (2011) |
| September 29 | 80.1°F (2013) | 33.1°F (2022) | 0.84 in (2019) |
| September 30 | 87.1°F (2025) | 33.1°F (2022) | 0.85 in (2018) |