Rochester, MN weather in September
September in Rochester: mild, with some rain. Highs 72°F, lows 50°F, rain on about 9 days. A good month for most outdoor plans.
- Normal high
- 72°F
- Normal low
- 50°F
- Wet days
- 9
- 3.6 in total
- Muggy days
- 2
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 76°F | 66°F |
| Normal low | 56°F | 45°F |
| Chance of a wet day | 31% | 32% |
| Sunrise / sunset | 6:33 am / 7:46 pm | 7:06 am / 6:53 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 am53°Fdew point 50°F
- 9 am61°Fdew point 53°F
- Noon68°Fdew point 53°F
- 3 pm70°Fdew point 52°F
- 6 pm65°Fdew point 53°F
- 9 pm58°Fdew point 52°F
NOAA hourly normals (local standard time) from Rochester Intl Airport (8 mi away); average wind 10 mph; clear or few clouds in 64% of daytime hours, mostly cloudy or overcast in 28%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F15 of 30
- Hot dayshigh 90°F or more0 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 3.6 in; a dry September brings about 1.8 in and a wet one about 4.7 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 76°F
- Coolest September1993: average high 63°F
- Wettest September2010: 9.9 in
- Driest September1999: 0.6 in
- Highest reading93°F (September 4, 2012)
- Lowest reading28°F (September 20, 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 | 78°F | 72°F | 58°F |
| Normal low | 58°F | 50°F | 38°F |
| Wet days | 10 | 9 | 10 |
| Comfortable days | 12 | 15 | 7 |
| Daylight | 14.0 h | 12.5 h | 11.0 h |
Highs change by -6°F from August and -14°F into October.
Nearby alternatives in September
- Warmer: Cedar Rapids, IA145 mi · high 77°F · 9 wet days
- Cooler: Duluth, MN192 mi · high 67°F · 10 wet days
How Rochester ranks in September
- Normal high330th warmest of 378 cities; 2nd of 3 in Minnesota
- Wet days270th driest of 378
- Comfortable days80th most of 342
What to pack for Rochester in September
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 170 heating degree days and 53 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Rochester in September?
The normal high is 72°F and the normal low is 50°F. From 1991 to 2020 the hottest September reading was 93°F (September 4, 2012).
Does it rain a lot in Rochester in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 3.6 in. The wettest September in 1991-2020 was in 2010 (10.0 in); the driest was in 1999 (0.6 in).
Is September a good time to visit Rochester?
September ranks 3rd of 12 months on our comfort score for Rochester (69 out of 100). It has about 15 comfortable days. The best months are May, June and September.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: Rochester Intl Airport (USW00014925), 8.2 mi S of the city center, 1,304 ft (280 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Rochester International Airport (726440-14925), 8.2 mi S of the city center, 1,305 ft (281 ft higher than the city). Hourly observations, 1991-2020.