Jonesboro, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jonesboro, a city in Union County, Illinois.
Tonight
72°F
Mostly Clear
Mostly clear. Low around 72, with temperatures rising to around 74 overnight. Southeast wind around 2 mph.
7-day forecast for Jonesboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 72°F | Mostly Clear | 2 mph SE | 8% |
| Saturday | 99°F | Sunny | 2 to 7 mph SW | 2% |
| Saturday Night | 72°F | Mostly Clear | 3 mph SSW | 0% |
| Sunday | 98°F | Sunny | 2 to 7 mph W | 3% |
| Sunday Night | 71°F | Partly Cloudy | 3 mph N | 7% |
| Monday | 90°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 8 mph N | 45% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 5 to 9 mph N | 45% |
| Tuesday | 78°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 7 to 12 mph N | 15% |
| Tuesday Night | 58°F | Partly Cloudy | 5 to 13 mph N | 9% |
| Wednesday | 78°F | Mostly Sunny | 8 mph N | 3% |
| Wednesday Night | 58°F | Partly Cloudy | 3 to 7 mph NNE | 2% |
| Thursday | 79°F | Mostly Sunny | 3 to 8 mph N | 3% |
| Thursday Night | 60°F | Partly Cloudy | 3 to 7 mph NNE | 3% |
| Friday | 78°F | Mostly Sunny | 5 to 8 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Jonesboro (37.451, -89.267). Updated through the day.
Growing snapshot for Jonesboro
Last spring frost
Apr 8
First fall frost
Oct 29
Growing season
203 days
Hardiness zone
7a
More local growing data for Jonesboro: nearby ZIP 62952 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Anna 2 Nne, Il (7.4 mi from Jonesboro). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.