September Weather in Quincy, United States

Last updated: June 24, 2025

In September, the average temperature in Quincy, United States hovers around 17°C (63°F). Temperatures can vary widely, with minimums dipping to -1°C (30°F) and soaring to a maximum of 37°C (98°F). Expect about 24 mm (1.0 in) of precipitation over 3 days, accompanied by an average humidity of 44%.

September Temperature in Quincy

In September in Quincy, the average temperature is 17°C (63°F). The maximum can reach 37°C (98°F), while the minimum can be as low as -1°C (30°F). Travelers should be prepared for a wide range of temperatures 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 17°C (63°F), with highs reaching up to 37°C (98°F) and lows dropping to around -1°C (30°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 24 mm (1.0 in) accumulated over a period 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 24 mm (1.0 inches) of precipitation spread over approximately 3 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 44%. With an average temperature of 17°C (63°F), this humidity feels like a comfortable breeze, making it perfect for leisurely strolls and outdoor activities while traveling.

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 44%, 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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, 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	0°C (33°F)	206 mm (8.1 inches)	84%	moderate
February Weather	0°C (33°F)	228 mm (9.0 inches)	84%	moderate
March Weather	2°C (37°F)	193 mm (7.6 inches)	83%	very high
April Weather	7°C (45°F)	97 mm (3.8 inches)	81%	very high
May Weather	12°C (54°F)	65 mm (2.6 inches)	74%	extreme
June Weather	18°C (65°F)	13 mm (0.5 inches)	64%	extreme
July Weather	23°C (74°F)	5 mm (0.2 inches)	44%	extreme
August Weather	22°C (72°F)	8 mm (0.3 inches)	36%	extreme
September Weather	17°C (63°F)	24 mm (1.0 inches)	44%	very high
October Weather	10°C (50°F)	52 mm (2.0 inches)	65%	high
November Weather	4°C (40°F)	100 mm (3.9 inches)	84%	moderate
December Weather	-1°C (31°F)	167 mm (6.6 inches)	83%	moderate