South Jacksonville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Jacksonville, a village in Morgan County, Illinois.
Today
88°F
Mostly Sunny
Mostly sunny, with a high near 88. South wind around 6 mph.
7-day forecast for South Jacksonville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Mostly Sunny | 6 mph S | 0% |
| Tonight | 69°F | Partly Cloudy | 6 mph SSE | 1% |
| Wednesday | 88°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 7 mph S | 27% |
| 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 | 16% |
| Friday | 85°F | Mostly Sunny | 3 mph SSW | 7% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 2 mph S | 25% |
| Saturday | 88°F | Chance Showers And Thunderstorms then Mostly Sunny | 2 to 6 mph SSW | 25% |
| Saturday Night | 70°F | Mostly Clear | 5 to 9 mph S | 8% |
| Sunday | 90°F | Sunny | 12 mph SSW | 3% |
| Sunday Night | 72°F | Mostly Clear | 10 mph SSW | 11% |
| Monday | 91°F | Mostly Sunny | 10 mph SSW | 11% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 9 mph SSW | 24% |
Forecast source: National Weather Service (api.weather.gov) for South Jacksonville (39.699, -90.224). Updated through the day.
Growing snapshot for South Jacksonville
Last spring frost
Apr 19
First fall frost
Oct 17
Growing season
179 days
Hardiness zone
6a
More local growing data for South Jacksonville: nearby ZIP 62650 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Alexander
Chapin
Concord
Franklin
Jacksonville
Lynnville
Meredosia
Merritt
Murrayville
Riggston
Waverly
Woodson
Climate data from the nearest NOAA station, Jacksonville 2E, Il (1.2 mi from South Jacksonville). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.