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September Weather in Rochester, United States

Last updated: June 24, 2025

In Rochester, United States, the average temperature in September hovers around 20°C (68°F). However, you might experience a minimum of 4°C (40°F) and a maximum of 33°C (92°F). The month sees about 67 mm (2.6 in) of precipitation spread over 8 days, contributing to an average humidity level of 78%. Prepare for a mix of pleasant warmth and occasional rain!

September Temperature in Rochester

In September, in Rochester, the average temperature is 20°C (68°F). Maximums can reach 33°C (92°F), and minimums can be as low as 4°C (40°F). It's advisable to pack layers to accommodate both warm days and cooler nights while enjoying your travels.

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

The chart illustrates September temperature patterns in Rochester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rochester, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec283041506373767368564134
Data source: Temperature data for Rochester 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 Rochester

In Rochester in September, the total precipitation amount is 67 mm (2.6 in) over the course of 8 days.

September Precipitation Trends in Rochester

The chart displays monthly precipitation patterns in Rochester, 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 Rochester, September typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec757710299155112111104671107965
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rochester

In Rochester in September humidity is 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

September Average Humidity in Rochester

This chart illustrates the average monthly humidity levels in Rochester, 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 Rochester 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 Rochester

In Rochester 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 Rochester.

Maximum UV Index Levels in Rochester for September

The chart shows the monthly maximum UV Index (UVI) for Rochester 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 Rochester typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35699101098642
Data source: Rochester 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 Rochester Compares to Other Months

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

This table compares monthly weather conditions in Rochester, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)75 mm (2.9 inches)85%moderate
February Weather-1°C (30°F)77 mm (3.0 inches)85%moderate
March Weather5°C (41°F)102 mm (4.0 inches)86%high
April Weather10°C (50°F)99 mm (3.9 inches)87%very high
May Weather17°C (63°F)155 mm (6.1 inches)81%very high
June Weather23°C (73°F)112 mm (4.4 inches)82%very high
July Weather24°C (76°F)111 mm (4.4 inches)81%very high
August Weather23°C (73°F)104 mm (4.1 inches)79%very high
September Weather20°C (68°F)67 mm (2.6 inches)78%very high
October Weather13°C (56°F)110 mm (4.3 inches)81%high
November Weather5°C (41°F)79 mm (3.1 inches)89%moderate
December Weather1°C (35°F)65 mm (2.5 inches)86%low

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