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September Weather in Quincy, United States

Last updated: June 24, 2025

In Quincy, United States, the average temperature in September is a mild 18°C (65°F). However, temperatures can vary significantly, with a minimum of 4°C (39°F) and soaring to a maximum of 37°C (99°F). Expect about 14 mm (0.6 in) of precipitation over 3 days, while the average humidity hovers around 60%, creating a comfortable atmosphere.

September Temperature in Quincy

In September, in Quincy, the average temperature is 18°C (65°F). Maximums can reach 37°C (99°F), while minimums can be as low as 4°C (39°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates September temperature patterns in Quincy, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Quincy, September typically has an average temperature of 18°C (65°F), with highs reaching up to 37°C (99°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec303242526370777665503932
Data source: Temperature data for Quincy 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 Quincy

In Quincy in September, the precipitation amount is 14 mm (0.6 in) accumulated over the course of 3 days.

September Precipitation Trends in Quincy

The chart displays monthly precipitation patterns in Quincy, 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 Quincy, September typically receives around 14 mm (0.6 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec484127261672314333942
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Quincy

In Quincy in September humidity is 60%. With an average temperature of 18°C (65°F), this humidity feels like a mild embrace, making it comfortable for exploring the sights, yet it can cause a slight stickiness in the air that may prompt occasional breaks and hydration.

September Average Humidity in Quincy

This chart illustrates the average monthly humidity levels in Quincy, 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 Quincy is approximately 60%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%82%77%79%77%62%60%80%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Quincy

In Quincy 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 Quincy.

Maximum UV Index Levels in Quincy for September

The chart shows the monthly maximum UV Index (UVI) for Quincy 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 Quincy typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2356891097532
Data source: Quincy 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 Quincy Compares to Other Months

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

This table compares monthly weather conditions in Quincy, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)48 mm (1.9 inches)85%low
February Weather0°C (32°F)40 mm (1.6 inches)86%moderate
March Weather6°C (43°F)27 mm (1.1 inches)86%moderate
April Weather11°C (52°F)26 mm (1.0 inches)82%high
May Weather17°C (63°F)16 mm (0.6 inches)77%very high
June Weather21°C (70°F)7 mm (0.3 inches)79%very high
July Weather25°C (77°F)1 mm (0.1 inches)77%very high
August Weather24°C (76°F)3 mm (0.1 inches)62%very high
September Weather18°C (65°F)14 mm (0.6 inches)60%high
October Weather10°C (50°F)33 mm (1.3 inches)80%moderate
November Weather4°C (39°F)39 mm (1.5 inches)87%moderate
December Weather0°C (32°F)41 mm (1.6 inches)86%low

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