September Weather in Quincy, United States

Last updated: June 24, 2025

In Quincy, United States, the average temperature in September hovers around 26°C (79°F). However, temperatures can vary significantly, with a minimum of 14°C (57°F) and soaring up to a maximum of 38°C (101°F). The month also sees a precipitation amount of 143 mm (5.6 in) spread across about 14 days, contributing to the region's average humidity of a humid 83%.

September Temperature in Quincy

In September in Quincy, the average temperature is 26°C (79°F). Maximums can reach 38°C (101°F), while minimums can drop as low as 14°C (57°F). Be sure to pack clothes suitable for both warm days and cooler evenings when traveling to Quincy during this month.

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 26°C (79°F), with highs reaching up to 38°C (101°F) and lows dropping to around 14°C (57°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 143 mm (5.6 in), spread over a duration of 14 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 143 mm (5.6 inches) of precipitation spread over approximately 14 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 83%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket enveloping you, making travel an exercise in endurance as the air clings to your skin and saps your energy.

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 83%, 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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, 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	12°C (54°F)	77 mm (3.0 inches)	85%	moderate
February Weather	15°C (60°F)	113 mm (4.4 inches)	82%	very high
March Weather	17°C (63°F)	56 mm (2.2 inches)	80%	very high
April Weather	20°C (68°F)	103 mm (4.1 inches)	76%	very high
May Weather	24°C (76°F)	82 mm (3.2 inches)	73%	extreme
June Weather	26°C (80°F)	198 mm (7.8 inches)	74%	extreme
July Weather	27°C (81°F)	194 mm (7.6 inches)	80%	extreme
August Weather	27°C (81°F)	173 mm (6.8 inches)	79%	extreme
September Weather	26°C (79°F)	143 mm (5.6 inches)	83%	very high
October Weather	23°C (73°F)	96 mm (3.8 inches)	77%	very high
November Weather	16°C (60°F)	52 mm (2.1 inches)	84%	high
December Weather	13°C (56°F)	127 mm (5.0 inches)	88%	moderate