Climate averages 1991–2020
Rochester (New York), United States weather
in September.
A mild, moderately wet month: the 4th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Rochester (New York), United States: daytime highs average 21.6°C and nights cool to about 14.3°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 88 mm of rain on roughly 11 days, which makes September a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 33 min on an average September day.
The nearest other city in this atlas is Cheektowaga (97 km away). In September its highs average 21.4°C, about as warm as Rochester (New York), United States, with 81 mm of rain.
Among the 498 cities listed in the United States, Rochester (New York), United States ranks joint 468th of 498 for the warmest September highs and joint 324th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Rochester (New York), United States is 5.3°C cooler than that mean.
From September to October, average highs fall by 6.8°C to 14.8°C, and monthly rainfall rises from 88 mm to 109 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Rochester (New York), United States climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.2°C-6.7°C | -6.7°C | 85 | 15.5 | 9.49 h |
| February | 0.4°C-7.1°C | -7.1°C | 67 | 11.1 | 10.510 h |
| March | 4.5°C-3.4°C | -3.4°C | 80 | 11.6 | 11.912 h |
| April | 10.9°C2.6°C | 2.6°C | 100 | 11.8 | 13.413 h |
| May | 17.3°C9.0°C | 9.0°C | 81 | 11.4 | 14.615 h |
| June | 22.5°C14.8°C | 14.8°C | 89 | 11.5 | 15.315 h |
| July | 25.7°C18.2°C | 18.2°C | 89 | 11.1 | 15.015 h |
| August | 25.1°C17.8°C | 17.8°C | 80 | 11.7 | 13.914 h |
| September, selected | 21.6°C14.3°C | 14.3°C | 88 | 10.7 | 12.513 h |
| October | 14.8°C8.4°C | 8.4°C | 109 | 13.3 | 11.111 h |
| November | 8.2°C2.3°C | 2.3°C | 95 | 14.0 | 9.810 h |
| December | 2.6°C-2.7°C | -2.7°C | 95 | 15.9 | 9.19 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Cheektowaga in SeptemberUnited States · 97 kmHigh 21.4°C · Low 14.0°C · 81 mm rain
- Amherst in SeptemberUnited States · 98 kmHigh 21.5°C · Low 14.2°C · 81 mm rain
- Buffalo in SeptemberUnited States · 107 kmHigh 21.1°C · Low 14.6°C · 85 mm rain
- Niagara Falls in SeptemberCanada · 118 kmHigh 21.2°C · Low 14.8°C · 85 mm rain
- Syracuse in SeptemberUnited States · 120 kmHigh 21.8°C · Low 13.8°C · 99 mm rain
- Oshawa in SeptemberCanada · 129 kmHigh 20.8°C · Low 14.4°C · 80 mm rain
- St. Catharines in SeptemberCanada · 132 kmHigh 21.5°C · Low 15.5°C · 85 mm rain
- Whitby in SeptemberCanada · 134 kmHigh 21.0°C · Low 14.5°C · 80 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Rochester) is explained once on the Rochester (New York), United States year overview and on the Sources, method and limits page.