Climate averages 1991–2020
Erie weather
in September.
A mild, wet month: the 4th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Erie: daytime highs average 21.2°C and nights cool to about 15.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 106 mm of rain on roughly 11 days, which makes September a wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 32 min on an average September day.
The nearest other city in this atlas is Brantford (113 km away). In September its highs average 21.6°C, about as warm as Erie, with 77 mm of rain.
Among the 498 cities listed in the United States, Erie ranks joint 476th of 498 for the warmest September highs and joint 416th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Erie is 5.7°C cooler than that mean.
From September to October, average highs fall by 6.5°C to 14.8°C, and monthly rainfall rises from 106 mm to 125 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
Erie climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 0.0°C-5.7°C | -5.7°C | 112 | 16.6 | 9.59 h |
| February | 0.5°C-6.2°C | -6.2°C | 78 | 12.1 | 10.511 h |
| March | 4.3°C-2.4°C | -2.4°C | 93 | 12.2 | 11.912 h |
| April | 10.9°C4.2°C | 4.2°C | 109 | 13.1 | 13.313 h |
| May | 17.8°C11.2°C | 11.2°C | 98 | 12.6 | 14.515 h |
| June | 23.1°C17.1°C | 17.1°C | 115 | 13.1 | 15.215 h |
| July | 25.3°C19.8°C | 19.8°C | 121 | 13.4 | 14.915 h |
| August | 24.6°C19.1°C | 19.1°C | 111 | 12.6 | 13.914 h |
| September, selected | 21.2°C15.6°C | 15.6°C | 106 | 11.1 | 12.513 h |
| October | 14.8°C9.5°C | 9.5°C | 125 | 14.5 | 11.111 h |
| November | 8.2°C3.5°C | 3.5°C | 123 | 15.5 | 9.810 h |
| December | 2.9°C-1.5°C | -1.5°C | 129 | 17.8 | 9.29 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
- Brantford in SeptemberCanada · 113 kmHigh 21.6°C · Low 13.0°C · 77 mm rain
- Stoney Creek in SeptemberCanada · 124 kmHigh 22.0°C · Low 14.1°C · 77 mm rain
- Hamilton in SeptemberCanada · 126 kmHigh 21.6°C · Low 15.1°C · 77 mm rain
- Buffalo in SeptemberUnited States · 130 kmHigh 21.1°C · Low 14.6°C · 85 mm rain
- London, Canada in SeptemberCanada · 134 kmHigh 21.4°C · Low 13.0°C · 86 mm rain
- St. Catharines in SeptemberCanada · 135 kmHigh 21.5°C · Low 15.5°C · 85 mm rain
- Niagara Falls in SeptemberCanada · 136 kmHigh 21.2°C · Low 14.8°C · 85 mm rain
- Cambridge, Canada in SeptemberCanada · 138 kmHigh 21.2°C · Low 12.3°C · 77 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 Erie) is explained once on the Erie year overview and on the Sources, method and limits page.