Rochester weather in September: Rochester, New York: normal highs, lows, rain and records for September
Rochester in September has a normal high of 74°F and a normal low of 54°F, a daily mean of 64°F, falling from 78°F on the 1st to 68°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 3.18 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 12°C, 81 mm of precipitation in September.
- NOAA stationFrederick Douglass Greater Rochester International Airport
- Station IDUSW00014768
- Location43.12°N 77.68°W
- Elevation533 ft (163 m)
- From the center5 miles
- Population207,282
- Jan 33° 19°
- Feb 35° 20°
- Mar 44° 27°
- Apr 57° 37°
- May 69° 48°
- Jun 78° 57°
- Jul 83° 62°
- Aug 81° 61°
- Sep 74° 54°
- Oct 61° 43°
- Nov 49° 34°
- Dec 39° 25°
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 74°F and the normal low 54°F, for a daily mean of 63.6°F. September is 7.1°F cooler than August and 11.4°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 78°F on September 1 to 68°F on September 30. From one year to the next September's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 61°F and 66°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 41%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 78°F | 58°F | 34% | 19% |
| September 8 | 76°F | 56°F | 35% | 20% |
| September 15 | 74°F | 54°F | 36% | 21% |
| September 22 | 71°F | 51°F | 38% | 23% |
| September 30 | 68°F | 49°F | 41% | 24% |
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 | 78°F | 58°F | 34% | 19% | 13 h 10 min |
| September 2 | 78°F | 58°F | 34% | 19% | 13 h 10 min |
| September 3 | 78°F | 58°F | 34% | 19% | 13 h 10 min |
| September 4 | 78°F | 58°F | 34% | 20% | 13 h 10 min |
| September 5 | 77°F | 57°F | 35% | 20% | 13 h |
| September 6 | 77°F | 57°F | 35% | 20% | 13 h |
| September 7 | 77°F | 57°F | 35% | 20% | 13 h |
| September 8 | 76°F | 56°F | 35% | 20% | 12 h 50 min |
| September 9 | 76°F | 56°F | 36% | 21% | 12 h 50 min |
| September 10 | 76°F | 56°F | 36% | 21% | 12 h 50 min |
| September 11 | 76°F | 55°F | 36% | 21% | 12 h 50 min |
| September 12 | 75°F | 55°F | 36% | 21% | 12 h 40 min |
| September 13 | 75°F | 55°F | 36% | 21% | 12 h 40 min |
| September 14 | 75°F | 54°F | 36% | 21% | 12 h 40 min |
| September 15 | 74°F | 54°F | 36% | 21% | 12 h 30 min |
| September 16 | 74°F | 54°F | 37% | 22% | 12 h 30 min |
| September 17 | 73°F | 53°F | 37% | 22% | 12 h 30 min |
| September 18 | 73°F | 53°F | 37% | 22% | 12 h 30 min |
| September 19 | 73°F | 53°F | 37% | 22% | 12 h 20 min |
| September 20 | 72°F | 52°F | 37% | 22% | 12 h 20 min |
| September 21 | 72°F | 52°F | 38% | 23% | 12 h 20 min |
| September 22 | 71°F | 51°F | 38% | 23% | 12 h 10 min |
| September 23 | 71°F | 51°F | 38% | 23% | 12 h 10 min |
| September 24 | 71°F | 51°F | 39% | 23% | 12 h 10 min |
| September 25 | 70°F | 50°F | 39% | 23% | 12 h 10 min |
| September 26 | 70°F | 50°F | 39% | 24% | 12 h |
| September 27 | 69°F | 50°F | 40% | 24% | 12 h |
| September 28 | 69°F | 49°F | 40% | 24% | 12 h |
| September 29 | 68°F | 49°F | 40% | 24% | 11 h 50 min |
| September 30 | 68°F | 49°F | 41% | 24% | 11 h 50 min |
- Normal high
- 74°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 3.18 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 20
- Days at 80°F or more
- 7
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014768; 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 37% on average, highest around September 30 (41%). In all, 3.18 in falls on 11 days of a normal September, 1 of them with an inch or more.
In a normal September in Rochester, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014768.
How humid and windy is Rochester in September?
At 3 p.m. the normal temperature is 65°F with 57% relative humidity and a dew point of 49°F; at 6 a.m. it is 51°F with 87% humidity. The wind averages 8.0 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 51°F | 48°F | 87% | 6.6 mph | 32% |
| 9 a.m. | 58°F | 50°F | 76% | 9.0 mph | 27% |
| noon | 63°F | 50°F | 61% | 10.7 mph | 22% |
| 3 p.m. | 65°F | 49°F | 57% | 10.6 mph | 24% |
| 6 p.m. | 60°F | 50°F | 68% | 7.7 mph | 27% |
| 9 p.m. | 56°F | 50°F | 81% | 6.2 mph | 39% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014768. 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 1872) is 99°F, on September 3, 1953; the coldest is 28°F, on September 28, 1947. The wettest September brought 6.30 in (1977).
The September mean against the 1991-2020 normal of 63.6°F: 2021 64.0°F (+0.4), 2022 62.5°F (−1.1), 2023 64.6°F (+1.0), 2024 66.4°F (+2.8), 2025 63.8°F (+0.1), 2026 63.8°F (+0.1). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 64.0°F | +0.4°F | 3.16 in |
| 2022 | 62.5°F | −1.1°F | 2.81 in |
| 2023 | 64.6°F | +1.0°F | 1.37 in |
| 2024 | 66.4°F | +2.8°F | 3.69 in |
| 2025 | 63.8°F | +0.1°F | 0.30 in |
| 2026 | 63.8°F | +0.1°F | 2.54 in |
Source: records: ACIS, NWS threaded record ROCthr; recent months: ACIS, station USW00014768. Records and recent months use complete months only.
How does September in Rochester compare across New York?
Across the 131 places PlainClimate covers in New York, September normal highs run from 64°F in Cooperstown to 78°F in Wantagh; Rochester's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.