Last updated: June 24, 2025
In September, the average temperature in Quincy, United States hovers around 19°C (66°F), offering a pleasant climate for exploration. Expect variations, with minimums dipping to 3°C (37°F) and highs reaching 33°C (91°F). During this month, precipitation typically totals 81 mm (3.2 in) over about 8 days, contributing to an average humidity level of 78%—perfect for lush landscapes but don't forget your umbrella!
In September in Quincy, the average temperature is 19°C (66°F). Maximums can reach 33°C (91°F) and minimums can be as low as 3°C (37°F). This makes it an ideal time for travelers to experience a range of outdoor activities, from enjoying warm days to cool evenings.
In Quincy in September, the precipitation amount is 81 mm (3.2 in) over the course of 8 days.
In Quincy in September, humidity is 78%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making traveling quite uncomfortable unless you're well-prepared with lightweight, breathable clothing and frequent breaks to stay hydrated.
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.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 71 mm (2.8 inches) | 85% | moderate |
| February Weather | -2°C (28°F) | 73 mm (2.9 inches) | 85% | moderate |
| March Weather | 3°C (38°F) | 89 mm (3.5 inches) | 86% | high |
| April Weather | 8°C (47°F) | 95 mm (3.7 inches) | 87% | very high |
| May Weather | 16°C (60°F) | 139 mm (5.5 inches) | 81% | very high |
| June Weather | 21°C (71°F) | 107 mm (4.2 inches) | 82% | very high |
| July Weather | 23°C (75°F) | 121 mm (4.8 inches) | 81% | very high |
| August Weather | 22°C (72°F) | 72 mm (2.8 inches) | 79% | very high |
| September Weather | 19°C (66°F) | 81 mm (3.2 inches) | 78% | very high |
| October Weather | 12°C (54°F) | 126 mm (5.0 inches) | 81% | high |
| November Weather | 4°C (39°F) | 79 mm (3.1 inches) | 89% | moderate |
| December Weather | 0°C (33°F) | 59 mm (2.3 inches) | 86% | low |