Quincy, IL Weather & Growing Conditions
Tonight
70°F
Mostly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 3am and 5am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Southwest wind around 5 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SW | 30% |
| Sunday | 79°F | Chance Showers And Thunderstorms | 7 mph NW | 38% |
| Sunday Night | 63°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 9 mph NE | 56% |
| Monday | 68°F | Showers And Thunderstorms Likely | 9 mph NE | 38% |
| Monday Night | 57°F | Rain Showers Likely | 8 mph NE | 39% |
| Tuesday | 65°F | Slight Chance Rain Showers | 9 mph NE | 16% |
| Tuesday Night | 52°F | Mostly Cloudy | 5 to 8 mph N | 9% |
| Wednesday | 67°F | Mostly Sunny | 6 mph N | 1% |
| Wednesday Night | 54°F | Partly Cloudy | 5 mph NE | 1% |
| Thursday | 70°F | Partly Sunny | 3 mph NE | 2% |
| Thursday Night | 58°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph NE | 16% |
| Friday | 74°F | Slight Chance Rain Showers | 5 mph NE | 17% |
| Friday Night | 59°F | Partly Cloudy | 3 mph NE | 10% |
| Saturday | 75°F | Mostly Sunny | 5 mph E | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Quincy, IL
Last spring frost
Apr 8
First fall frost
Oct 30
Growing season
204 days
Hardiness zone
6a
Explore more for Quincy, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Quincy Dam 21, Il (4.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.