Quincy, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Quincy, a city in Adams County, Illinois.
Overnight
65°F
Clear
Clear, with a low around 65. Southeast wind around 5 mph.
7-day forecast for Quincy
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Clear | 5 mph SE | 0% |
| Tuesday | 89°F | Sunny | 6 mph S | 0% |
| Tuesday Night | 71°F | Partly Cloudy | 2 to 6 mph SE | 13% |
| Wednesday | 85°F | Scattered Showers And Thunderstorms | 5 mph S | 53% |
| Wednesday Night | 68°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph NE | 90% |
| Thursday | 83°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 3 mph SE | 90% |
| Thursday Night | 67°F | Partly Cloudy | 2 mph SE | 9% |
| Friday | 86°F | Mostly Sunny | 2 mph S | 9% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 3 mph S | 32% |
| Saturday | 89°F | Slight Chance Showers And Thunderstorms then Sunny | 5 mph SW | 23% |
| Saturday Night | 73°F | Mostly Clear | 5 to 8 mph S | 6% |
| Sunday | 91°F | Sunny | 7 to 10 mph SW | 3% |
| Sunday Night | 73°F | Mostly Clear | 9 mph S | 10% |
| Monday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 9 mph SW | 15% |
Forecast source: National Weather Service (api.weather.gov) for Quincy (39.934, -91.379). Updated through the day.
Growing snapshot for Quincy
Last spring frost
Apr 8
First fall frost
Oct 30
Growing season
204 days
Hardiness zone
6a
More local growing data for Quincy: nearby ZIP 62301 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Adams
Bloomfield
Burton
Camp Point
Clayton
Coatsburg
Columbus
Fall Creek
Fowler
Golden
Kingston
La Prairie
Liberty
Lima
Loraine
Marcelline
Mendon
Paloma
Payson
Plainville
Richfield
Ursa
Climate data from the nearest NOAA station, Quincy Dam 21, Il (2.8 mi from Quincy). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.