Quincy (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Quincy.
Climate overview of Quincy
The climate in Quincy, Illinois, United States of America, is marked by large temperature swings across the seasons, ranging from 30°C (86°F) in July to 2°C (36°F) in January.
Annual rain/snowfall is moderate at around 983 mm (39 in), with June being the wettest month. The city also has very warm summers and cold winters.
Quincy Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Quincy - and find the best time to visit.
Monthly Temperature in Quincy
In Quincy, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a very warm 30°C (86°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 2°C (36°F).
At night, temperatures range from around 20°C (68°F) in July to -8°C (18°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Quincy
On average, Quincy receives a reasonable amount of rain/snowfall, with an annual precipitation of 983 mm (39 in). Quincy can be quite wet during June, receiving approximately 140 mm (5.5 in) of precipitation over 12 rainy days.
In contrast, during the driest month (January), you will experience much drier conditions, with 34 mm (1.3 in) of precipitation spread across 7 snowy/rainy days. For more details, please visit our Quincy Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Quincy
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: September
- Warmest weather: July and August
- Fewer rainy days: January, February, August, September and November
- Seasonal pattern: Very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -8°C (18°F).
Frequently asked questions about the climate in Quincy
What is the best time to visit Quincy?
September typically offers the most optimal weather in Quincy. In contrast, January, February and December tend to have less optimal conditions. Quincy has very warm summers and cold winters.
What temperatures can I expect in Quincy?
Daytime highs range from 2°C (36°F) in January to 30°C (86°F) in July. Nighttime lows range from -8°C (18°F) to 20°C (68°F). Temperatures vary considerably through the year.
How much rain does Quincy get?
Annual rainfall is around 983 mm (39 in). June is the wettest month with 140 mm (5.5 in), while January is the driest with 34 mm (1.3 in).
Quincy 3-Day Forecast
Quincy (IL) 3-Day Forecast
Quincy on the map
Quincy is highlighted - select any city to see its climate.
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