September is one of the warmer months of the year in Buffalo, with average highs near 22.4°C and lows around 12.8°C (mean 17.6°C). It is a relatively wet time of year, averaging 87 mm of rainfall and 72% relative humidity across the period.
September is one of the warmer months of the year in Buffalo. Across 45 years of records, the warmest Septembers in Buffalo were 2015 and 2024 — when the month averaged 20.4°C — while the coldest was 1993 at 14.8°C. Typical September days reach 22.4°C with nights near 12.8°C. The long-term trend is warming, about 0.8°C per decade.
September is a relatively wet time of year in Buffalo, averaging 87 mm of rainfall. The wettest September on record was 2006 with 146 mm, while the driest was 2025 at 26 mm.
Relative humidity in Buffalo during September averages 72%. The most humid September was 2006 at 81%, and the least humid was 1991 at 63%.
September receives about 4 kWh/m²/day of solar energy in Buffalo. The sunniest Septembers were 2005 and 2016 at 4.7 kWh/m²/day, and the cloudiest was 1993 at 3.1.
Average wind speed in Buffalo during September is 1.4 m/s. The windiest September was 2010 at 1.7 m/s, while the calmest were 1987 and 2025 at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.7°C | 16.3°C | 17.8°C | 18.7°C | 19.1°C | +2.4°C |
| Avg High | 21.4°C | 21.2°C | 22.7°C | 23.6°C | 23.9°C | +2.5°C |
| Avg Low | 11.9°C | 11.5°C | 12.9°C | 13.9°C | 14.2°C | +2.3°C |
| Avg Rain | 97 mm | 88 mm | 97 mm | 82 mm | 65 mm | -32 mm |
September temperatures in Buffalo have risen by about 2.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.9°C (1991) to a record high of 33.4°C (2002).
Rainfall in September is a relatively wet time of year, averaging 87 mm, with a wettest year of 146 mm.
One of the best times to visit Buffalo
September is one of the best times to visit Buffalo. Expect days averaging 22.4°C and nights around 12.8°C (mean 17.6°C) — warmer than Buffalo's yearly average — with higher rainfall (87 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 24.6°C | 19.3°C | 13.9°C | 28.7°C | 9.2°C | 26 mm | 66% | 1.1 m/s | 4.6 |
| 2024 | 25.6°C | 20.4°C | 15.2°C | 29.6°C | 10.8°C | 74 mm | 69% | 1.2 m/s | 4.3 |
| 2023 | 23.9°C | 19.1°C | 14.4°C | 31.9°C | 10.2°C | 34 mm | 69% | 1.3 m/s | 4.3 |
| 2022 | 22.5°C | 18.2°C | 13.9°C | 30.3°C | 5.2°C | 98 mm | 73% | 1.4 m/s | 3.7 |
| 2021 | 23.5°C | 19.0°C | 14.5°C | 27.9°C | 9.7°C | 105 mm | 71% | 1.6 m/s | 4.1 |
| 2020 | 23.3°C | 18.3°C | 13.3°C | 29.7°C | 5.8°C | 53 mm | 69% | 1.6 m/s | 4.2 |
| 2019 | 23.8°C | 18.8°C | 13.9°C | 29.3°C | 10.9°C | 90 mm | 75% | 1.4 m/s | 4.2 |
| 2018 | 24.5°C | 20.1°C | 15.6°C | 32.5°C | 9.0°C | 84 mm | 75% | 1.4 m/s | 3.7 |
| 2017 | 24.3°C | 19.2°C | 14.0°C | 32.3°C | 7.7°C | 62 mm | 70% | 1.2 m/s | 4.3 |
| 2016 | 25.3°C | 20.2°C | 15.0°C | 31.4°C | 9.0°C | 68 mm | 69% | 1.4 m/s | 4.7 |
| 2015 🔥 | 25.4°C | 20.4°C | 15.4°C | 31.7°C | 10.4°C | 111 mm | 71% | 1.4 m/s | 4.4 |
| 2014 | 22.9°C | 17.7°C | 12.6°C | 30.1°C | 7.1°C | 60 mm | 72% | 1.4 m/s | 4.2 |
| 2013 | 22.0°C | 17.0°C | 11.9°C | 31.0°C | 5.5°C | 63 mm | 70% | 1.4 m/s | 4.3 |
| 2012 | 22.5°C | 17.8°C | 13.2°C | 32.2°C | 6.8°C | 100 mm | 68% | 1.4 m/s | 4 |
| 2011 | 23.0°C | 18.6°C | 14.3°C | 31.6°C | 7.7°C | 98 mm | 76% | 1.4 m/s | 3.7 |
| 2010 | 21.9°C | 17.4°C | 12.9°C | 31.3°C | 7.8°C | 86 mm | 71% | 1.7 m/s | 3.4 |
| 2009 | 22.5°C | 17.7°C | 13.0°C | 27.5°C | 6.8°C | 68 mm | 71% | 1.4 m/s | 3.9 |
| 2008 | 22.8°C | 18.0°C | 13.1°C | 30.4°C | 7.5°C | 79 mm | 74% | 1.3 m/s | 4 |
| 2007 | 24.4°C | 19.1°C | 13.8°C | 32.4°C | 7.6°C | 74 mm | 66% | 1.4 m/s | 4.4 |
| 2006 🌧️ | 19.6°C | 15.9°C | 12.2°C | 26.4°C | 7.0°C | 146 mm | 81% | 1.6 m/s | 3.2 |
| 2005 | 24.2°C | 19.2°C | 14.3°C | 29.9°C | 8.2°C | 129 mm | 72% | 1.5 m/s | 4.7 |
| 2004 | 23.2°C | 18.7°C | 14.2°C | 29.5°C | 7.9°C | 118 mm | 76% | 1.3 m/s | 4.5 |
| 2003 | 21.7°C | 16.9°C | 12.0°C | 27.1°C | 6.2°C | 91 mm | 75% | 1.4 m/s | 3.9 |
| 2002 | 24.9°C | 19.1°C | 13.4°C | 33.4°C | 7.7°C | 83 mm | 66% | 1.3 m/s | 4.5 |
| 2001 | 21.4°C | 16.5°C | 11.5°C | 31.3°C | 6.1°C | 74 mm | 67% | 1.3 m/s | 4.4 |
| 2000 | 22.0°C | 16.9°C | 11.8°C | 31.1°C | 2.1°C | 108 mm | 71% | 1.6 m/s | 4.1 |
| 1999 | 23.7°C | 18.5°C | 13.2°C | 30.8°C | 4.7°C | 97 mm | 67% | 1.4 m/s | 4.1 |
| 1998 | 23.4°C | 18.6°C | 13.8°C | 29.4°C | 7.7°C | 62 mm | 68% | 1.5 m/s | 4.1 |
| 1997 | 21.1°C | 16.5°C | 11.9°C | 26.9°C | 5.3°C | 121 mm | 73% | 1.6 m/s | 3.8 |
| 1996 | 20.9°C | 16.6°C | 12.3°C | 28.6°C | 6.2°C | 126 mm | 78% | 1.4 m/s | 3.3 |
| 1995 | 20.7°C | 15.3°C | 9.9°C | 27.1°C | 4.1°C | 48 mm | 66% | 1.3 m/s | 4.2 |
| 1994 | 20.7°C | 15.8°C | 11.0°C | 26.9°C | 6.6°C | 78 mm | 74% | 1.3 m/s | 3.9 |
| 1993 ❄️ | 19.3°C | 14.8°C | 10.2°C | 28.7°C | 1.5°C | 97 mm | 73% | 1.5 m/s | 3.1 |
| 1992 | 20.3°C | 15.4°C | 10.4°C | 26.3°C | 2.5°C | 100 mm | 77% | 1.4 m/s | 4 |
| 1991 | 21.1°C | 15.8°C | 10.6°C | 29.6°C | 0.9°C | 59 mm | 63% | 1.4 m/s | 4.2 |
| 1990 | 20.4°C | 15.8°C | 11.2°C | 28.4°C | 4.3°C | 90 mm | 75% | 1.4 m/s | 3.5 |
| 1989 | 21.0°C | 16.2°C | 11.3°C | 28.1°C | 1.8°C | 91 mm | 74% | 1.3 m/s | 3.8 |
| 1988 | 21.5°C | 16.1°C | 10.6°C | 27.2°C | 5.3°C | 60 mm | 69% | 1.4 m/s | 3.9 |
| 1987 | 20.7°C | 16.2°C | 11.8°C | 26.2°C | 6.8°C | 121 mm | 80% | 1.1 m/s | 3.7 |
| 1986 | 21.5°C | 16.8°C | 12.1°C | 27.2°C | 5.9°C | 138 mm | 75% | 1.5 m/s | 3.5 |
| 1985 | 23.1°C | 18.2°C | 13.3°C | 29.5°C | 7.7°C | 71 mm | 69% | 1.5 m/s | 4.5 |
| 1984 | 20.4°C | 15.7°C | 10.9°C | 26.5°C | 4.6°C | 117 mm | 73% | 1.4 m/s | 4.2 |
| 1983 | 23.1°C | 18.2°C | 13.3°C | 31.1°C | 6.6°C | 64 mm | 66% | 1.6 m/s | — |
| 1982 | 21.8°C | 16.7°C | 11.7°C | 30.8°C | 6.6°C | 86 mm | 72% | 1.3 m/s | — |
| 1981 | 19.6°C | 15.8°C | 11.9°C | 29.0°C | 4.8°C | 125 mm | 78% | 1.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.4°C with lows near 12.8°C (mean 17.6°C), based on 45 years of NASA POWER data.
September averages 87 mm of rainfall in Buffalo, a relatively wet time of year. The wettest on record was 146 mm in 2006.
The hottest September reached 33.4°C in 2002. The coldest dipped to 0.9°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.3°C. Daytime highs moved from 21.6°C to 24°C and overnight lows from 12.2°C to 14.4°C over the same span.
September is one of the warmer months of the year in Buffalo and a relatively wet time of year, so plan for around 22.4°C daytime highs and 12.8°C at night.
Not quite — September is the 9th coolest month in Buffalo, averaging 17.6°C.
For September in Buffalo, pack light layers you can adjust through the day, with typical highs of 22.4°C and lows of 12.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 72% — moderately humid.
Average wind speed in September is 1.4 m/s. The windiest September on record averaged 1.7 m/s (2010).
The wettest September on record was 2006 with 146 mm. On average, September sees 87 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Buffalo behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
