nomadseason

September Weather in Rochester, United States

Last updated: June 24, 2025

In September, the average temperature in Rochester, United States is a pleasant 18°C (65°F). Expect fluctuations, with a minimum temperature of 2°C (35°F) and a maximum reaching up to 34°C (93°F). During this time, 78 mm (3.1 in) of precipitation can be anticipated, spread over about 10 days. Keep in mind the high humidity level of 80%, which may add a touch of moisture to the air!

September Temperature in Rochester

In September in Rochester, the average temperature is 18°C (65°F). Maximums can reach 34°C (93°F), and minimums can be as low as 2°C (35°F). Be prepared for a wide range of temperatures when traveling during this month, so pack accordingly!

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 18°C (65°F), with highs reaching up to 34°C (93°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec252736465969747165533832
Data source: Temperature data for Rochester generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Rochester

In Rochester in September, the precipitation amount is 78 mm (3.1 in) over the course of 10 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 78 mm (3.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec626868951101049392781077153
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Rochester

In Rochester in September, humidity is 80%. With an average temperature of 18°C (65°F), this humidity feels like wandering through a warm, damp blanket, making every step slightly heavy and resulting in a constant sheen of sweat, which can be both refreshing and exhausting for travelers.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%85%86%80%80%80%81%80%84%90%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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097542
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-4°C (26°F)62 mm (2.4 inches)88%low
February Weather-3°C (27°F)68 mm (2.7 inches)87%moderate
March Weather2°C (36°F)68 mm (2.7 inches)85%moderate
April Weather8°C (46°F)95 mm (3.8 inches)86%very high
May Weather15°C (59°F)110 mm (4.3 inches)80%very high
June Weather21°C (69°F)104 mm (4.1 inches)80%very high
July Weather23°C (74°F)93 mm (3.7 inches)80%very high
August Weather22°C (72°F)92 mm (3.6 inches)80%very high
September Weather18°C (65°F)78 mm (3.1 inches)80%high
October Weather12°C (53°F)107 mm (4.2 inches)84%moderate
November Weather4°C (39°F)71 mm (2.8 inches)89%moderate
December Weather0°C (32°F)53 mm (2.1 inches)86%low

Compare Rochester's Climate with Cities Worldwide