September Weather in Quincy, United States

Last updated: June 24, 2025

In September, the average temperature in Quincy, United States hovers around 21°C (71°F), making it a pleasant time to explore. However, temperatures can vary significantly, with minimums dipping to 5°C (42°F) and maximums soaring to 35°C (95°F). Be prepared for potential rainfall as precipitation reaches 84 mm (3.3 in) over an average of 7 days. The air tends to be quite humid, averaging around 76%, creating a warm and sticky atmosphere.

September Temperature in Quincy

In September in Quincy, the average temperature is 21°C (71°F). Maximum temperatures can reach 35°C (95°F), while minimums can drop as low as 5°C (42°F). This range makes it a great time for travelers looking to enjoy a variety of outdoor activities and experiences.

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 21°C (71°F), with highs reaching up to 35°C (95°F) and lows dropping to around 5°C (42°F).

Data source: Temperature data for Quincy generated using information from the Copernicus Climate Change Service.

September Precipitation in Quincy

In Quincy in September, the total precipitation amount is 84 mm (3.3 in) distributed over a span of 7 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 84 mm (3.3 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Quincy

In Quincy in September humidity is 76%. With an average temperature of 21°C (71°F), this humidity feels like a warm, enveloping blanket, making traveling both refreshing and a bit exhausting, as the air clings to your skin and you often find yourself reaching for water to stay hydrated.

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 76%, offering insight into how humid the weather typically is during this month.

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 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 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 8, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	60 mm (2.4 inches)	82%	moderate
February Weather	-1°C (31°F)	59 mm (2.3 inches)	80%	moderate
March Weather	7°C (44°F)	113 mm (4.4 inches)	80%	high
April Weather	11°C (53°F)	102 mm (4.0 inches)	80%	very high
May Weather	19°C (66°F)	168 mm (6.6 inches)	82%	very high
June Weather	24°C (76°F)	108 mm (4.2 inches)	83%	extreme
July Weather	26°C (79°F)	86 mm (3.4 inches)	81%	very high
August Weather	24°C (76°F)	90 mm (3.6 inches)	80%	very high
September Weather	21°C (71°F)	84 mm (3.3 inches)	76%	very high
October Weather	14°C (57°F)	106 mm (4.2 inches)	76%	high
November Weather	6°C (42°F)	53 mm (2.1 inches)	85%	moderate
December Weather	2°C (36°F)	42 mm (1.7 inches)	86%	moderate