Jacksonville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jacksonville, a city in Morgan County, Illinois.
Overnight
63°F
Clear
Clear, with a low around 63. South southeast wind around 3 mph.
7-day forecast for Jacksonville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Clear | 3 mph SSE | 0% |
| Tuesday | 88°F | Sunny | 6 mph S | 0% |
| Tuesday Night | 68°F | Partly Cloudy | 6 mph SSE | 2% |
| Wednesday | 88°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 7 mph S | 28% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 mph SSE | 78% |
| Thursday | 83°F | Showers And Thunderstorms | 5 mph SSW | 78% |
| Thursday Night | 65°F | Slight Chance Showers And Thunderstorms | 3 mph SSE | 15% |
| Friday | 85°F | Mostly Sunny | 2 mph SSW | 7% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 2 mph S | 25% |
| Saturday | 88°F | Chance Showers And Thunderstorms then Sunny | 2 to 6 mph SSW | 25% |
| Saturday Night | 71°F | Mostly Clear | 5 to 9 mph S | 8% |
| Sunday | 90°F | Sunny | 8 to 12 mph SSW | 3% |
| Sunday Night | 72°F | Mostly Clear | 10 mph S | 12% |
| Monday | 91°F | Mostly Sunny | 10 mph SSW | 12% |
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 Aug 4, 2026.