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September Weather in Buffalo, United States

Last updated: June 24, 2025

The average temperature in Buffalo, United States during September is a cool 12°C (54°F). However, temperatures can vary widely, with minimums dipping to -11°C (12°F) and maximums soaring to 32°C (89°F). This month also sees 75 mm (3.0 in) of precipitation over about 11 days, while the average humidity sits at a notable 79%. Stay prepared for a mix of weather!

September Temperature in Buffalo

In September in Buffalo, the average temperature is 12°C (54°F). Maximums can reach 32°C (89°F) while minimums can drop as low as -11°C (12°F). Be prepared for a wide range of temperatures when traveling during this time.

September Weather in Buffalo: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Buffalo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Buffalo, September typically has an average temperature of 12°C (54°F), with highs reaching up to 32°C (89°F) and lows dropping to around -11°C (12°F).
JanFebMarAprMayJunJulAugSepOctNovDec221830344458656254372923
Data source: Temperature data for Buffalo generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Buffalo

In Buffalo in September, the precipitation amount is 75 mm (3.0 in) over a span of 11 days.

September Precipitation Trends in Buffalo

The chart displays monthly precipitation patterns in Buffalo, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Buffalo, September typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec2451669514912714011975804430
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Buffalo

In Buffalo in September, humidity is 79%. With an average temperature of 12°C (54°F), this humidity makes traveling feel quite muggy, leading to a sticky discomfort that can sap your energy and make outdoor activities less enjoyable.

September Average Humidity in Buffalo

This chart illustrates the average monthly humidity levels in Buffalo, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Buffalo is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%79%71%70%75%82%84%85%79%75%75%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Buffalo

In Buffalo in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Buffalo.

Maximum UV Index Levels in Buffalo for September

The chart shows the monthly maximum UV Index (UVI) for Buffalo in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Buffalo typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35710101111109642
Data source: Buffalo September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Buffalo Compares to Other Months

Weather in Buffalo varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Buffalo, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Buffalo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)24 mm (1.0 inches)78%moderate
February Weather-8°C (18°F)51 mm (2.0 inches)79%moderate
March Weather-1°C (31°F)66 mm (2.6 inches)71%high
April Weather1°C (34°F)95 mm (3.7 inches)70%very high
May Weather7°C (45°F)149 mm (5.9 inches)75%very high
June Weather14°C (58°F)127 mm (5.0 inches)82%extreme
July Weather18°C (65°F)140 mm (5.5 inches)84%extreme
August Weather17°C (62°F)119 mm (4.7 inches)85%very high
September Weather12°C (54°F)75 mm (3.0 inches)79%very high
October Weather3°C (37°F)80 mm (3.2 inches)75%high
November Weather-2°C (29°F)44 mm (1.7 inches)75%moderate
December Weather-5°C (24°F)30 mm (1.2 inches)81%low

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