Jacksonville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jacksonville, a city in Morgan County, Illinois.
Overnight
72°F
Mostly Clear
Mostly clear, with a low around 72. South wind around 6 mph.
7-day forecast for Jacksonville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 72°F | Mostly Clear | 6 mph S | 4% |
| Saturday | 93°F | Mostly Cloudy | 5 to 8 mph SW | 7% |
| Saturday Night | 69°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SSW | 27% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 2 to 9 mph NNW | 48% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 71% |
| Monday | 70°F | Showers And Thunderstorms Likely | 13 mph NE | 71% |
| Monday Night | 55°F | Chance Rain Showers | 9 to 13 mph NE | 33% |
| Tuesday | 66°F | Slight Chance Rain Showers | 13 mph NE | 24% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NNE | 8% |
| Wednesday | 70°F | Mostly Sunny | 9 mph NNE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 8 mph NNE | 1% |
| Thursday | 72°F | Mostly Sunny | 3 to 7 mph NNE | 3% |
| Thursday Night | 55°F | Partly Cloudy | 2 to 6 mph NNE | 3% |
| Friday | 75°F | Mostly Sunny | 3 to 7 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Jacksonville (39.729, -90.232). Updated through the day.
Growing snapshot for Jacksonville
Last spring frost
Apr 19
First fall frost
Oct 17
Growing season
179 days
Hardiness zone
6a
More local growing data for Jacksonville: nearby ZIP 62650 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Alexander
Chapin
Concord
Franklin
Lynnville
Meredosia
Merritt
Murrayville
Riggston
South Jacksonville
Waverly
Woodson
Climate data from the nearest NOAA station, Jacksonville 2E, Il (1.2 mi from Jacksonville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.