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September Weather in Buffalo, United States

Last updated: June 24, 2025

In Buffalo, United States, the average temperature in September hovers around 20°C (69°F), with a minimum dipping to 5°C (41°F) and a maximum reaching up to 33°C (92°F). Expect 66 mm (2.6 in) of precipitation spread over about 8 days, and enjoy an average humidity level of 78%.

September Temperature in Buffalo

In September in Buffalo, the average temperature is 20°C (69°F), with maximums reaching 33°C (92°F) and minimums dropping to as low as 5°C (41°F). This makes it an ideal time for travelers to experience a pleasant mix of warm days and cooler evenings.

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 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec283041506373767469564135
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 total precipitation amount is 66 mm (2.6 in) over the course of 8 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 66 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec7477103102165109111108661167462
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 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35699101098642
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-2°C (28°F)74 mm (2.9 inches)85%moderate
February Weather-1°C (30°F)77 mm (3.0 inches)85%moderate
March Weather5°C (41°F)103 mm (4.0 inches)86%high
April Weather10°C (51°F)102 mm (4.0 inches)87%very high
May Weather17°C (63°F)165 mm (6.5 inches)81%very high
June Weather23°C (74°F)109 mm (4.3 inches)82%very high
July Weather25°C (77°F)111 mm (4.4 inches)81%very high
August Weather23°C (74°F)108 mm (4.2 inches)79%very high
September Weather20°C (69°F)66 mm (2.6 inches)78%very high
October Weather14°C (57°F)116 mm (4.5 inches)81%high
November Weather5°C (41°F)74 mm (2.9 inches)89%moderate
December Weather1°C (35°F)62 mm (2.4 inches)86%low

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