Rochester weather in September: Rochester, Minnesota: normal highs, lows, rain and records for September
Rochester in September has a normal high of 72°F and a normal low of 50°F, a daily mean of 61°F, falling from 76°F on the 1st to 66°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 3.60 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 10°C, 91 mm of precipitation in September.
- NOAA stationRochester International Airport
- Station IDUSW00014925
- Location43.90°N 92.49°W
- Elevation1,304 ft (398 m)
- Population123,624
- Jan 23° 7°
- Feb 27° 11°
- Mar 40° 23°
- Apr 55° 35°
- May 68° 47°
- Jun 78° 58°
- Jul 80° 61°
- Aug 78° 58°
- Sep 72° 50°
- Oct 58° 38°
- Nov 42° 26°
- Dec 28° 14°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Rochester in September?
The normal high is 72°F and the normal low 50°F, for a daily mean of 61.1°F. September is 7.1°F cooler than August and 13.2°F warmer than October. September is the 4th warmest month of the year in Rochester and the 5th wettest. Across the month the normal high falls 10°F, from 76°F on September 1 to 66°F on September 30. From one year to the next September's mean temperature typically moves about 3.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 58°F and 64°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 32%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 76°F | 56°F | 31% | 19% |
| September 8 | 75°F | 53°F | 31% | 20% |
| September 15 | 72°F | 51°F | 31% | 20% |
| September 22 | 70°F | 48°F | 32% | 20% |
| September 30 | 66°F | 45°F | 32% | 19% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 76°F | 56°F | 31% | 19% | 13 h 20 min |
| September 2 | 76°F | 55°F | 31% | 19% | 13 h 10 min |
| September 3 | 76°F | 55°F | 31% | 19% | 13 h 10 min |
| September 4 | 75°F | 55°F | 31% | 20% | 13 h 10 min |
| September 5 | 75°F | 54°F | 31% | 20% | 13 h |
| September 6 | 75°F | 54°F | 31% | 20% | 13 h |
| September 7 | 75°F | 54°F | 31% | 20% | 13 h |
| September 8 | 75°F | 53°F | 31% | 20% | 13 h |
| September 9 | 74°F | 53°F | 31% | 20% | 12 h 50 min |
| September 10 | 74°F | 53°F | 31% | 20% | 12 h 50 min |
| September 11 | 74°F | 52°F | 31% | 20% | 12 h 50 min |
| September 12 | 73°F | 52°F | 31% | 20% | 12 h 40 min |
| September 13 | 73°F | 52°F | 31% | 20% | 12 h 40 min |
| September 14 | 73°F | 51°F | 31% | 20% | 12 h 40 min |
| September 15 | 72°F | 51°F | 31% | 20% | 12 h 40 min |
| September 16 | 72°F | 50°F | 31% | 20% | 12 h 30 min |
| September 17 | 72°F | 50°F | 31% | 20% | 12 h 30 min |
| September 18 | 71°F | 50°F | 32% | 20% | 12 h 30 min |
| September 19 | 71°F | 49°F | 32% | 20% | 12 h 20 min |
| September 20 | 71°F | 49°F | 32% | 20% | 12 h 20 min |
| September 21 | 70°F | 48°F | 32% | 20% | 12 h 20 min |
| September 22 | 70°F | 48°F | 32% | 20% | 12 h 10 min |
| September 23 | 69°F | 48°F | 32% | 20% | 12 h 10 min |
| September 24 | 69°F | 47°F | 32% | 20% | 12 h 10 min |
| September 25 | 68°F | 47°F | 32% | 20% | 12 h 10 min |
| September 26 | 68°F | 46°F | 32% | 20% | 12 h |
| September 27 | 68°F | 46°F | 32% | 20% | 12 h |
| September 28 | 67°F | 45°F | 32% | 19% | 12 h |
| September 29 | 67°F | 45°F | 32% | 19% | 11 h 50 min |
| September 30 | 66°F | 45°F | 32% | 19% | 11 h 50 min |
- Normal high
- 72°FSeptember average
- Normal low
- 50°FSeptember average
- Precipitation
- 3.60 inmonth total
- Days with precipitation
- 90.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 18
- Days at 80°F or more
- 7
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014925; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Rochester in September?
On a given September day the chance of 0.01 inch or more is 31% on average, highest around September 26 (32%). In all, 3.60 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Rochester, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014925.
How humid and windy is Rochester in September?
At 3 p.m. the normal temperature is 64°F with 50% relative humidity and a dew point of 45°F; at 6 a.m. it is 48°F with 85% humidity. The wind averages 10.7 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 48°F | 44°F | 85% | 9.5 mph | 58% |
| 9 a.m. | 55°F | 46°F | 71% | 11.6 mph | 65% |
| noon | 62°F | 45°F | 54% | 13.1 mph | 57% |
| 3 p.m. | 64°F | 45°F | 50% | 13.2 mph | 65% |
| 6 p.m. | 58°F | 45°F | 62% | 9.5 mph | 59% |
| 9 p.m. | 53°F | 45°F | 73% | 9.8 mph | 71% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014925. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Rochester?
The warmest September temperature on Rochester's official record (since 1886) is 100°F, on September 6, 1913; the coldest is 22°F, on September 28, 1893. The wettest September brought 10.50 in (1986).
The September mean against the 1991-2020 normal of 61.1°F: 2021 63.1°F (+2.0), 2022 61.6°F (+0.5), 2023 66.3°F (+5.2), 2024 65.4°F (+4.3), 2025 64.4°F (+3.3), 2026 64.2°F (+3.1). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.1°F | +2.0°F | 1.63 in |
| 2022 | 61.6°F | +0.5°F | 0.97 in |
| 2023 | 66.3°F | +5.2°F | 3.43 in |
| 2024 | 65.4°F | +4.3°F | 0.77 in |
| 2025 | 64.4°F | +3.3°F | 4.15 in |
| 2026 | 64.2°F | +3.1°F | 6.22 in |
Source: records: ACIS, NWS threaded record RSTthr; recent months: ACIS, station USW00014925. Records and recent months use complete months only.
How does September in Rochester compare across Minnesota?
Across the 129 places PlainClimate covers in Minnesota, September normal highs run from 62°F in Lutsen to 76°F in Milan; Rochester's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.