South Jacksonville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Jacksonville, a village in Morgan County, Illinois.
Overnight
54°F
Mostly Cloudy
Mostly cloudy, with a low around 54. West southwest wind around 12 mph, with gusts as high as 22 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for South Jacksonville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Mostly Cloudy | 12 mph WSW | 12% |
| Wednesday | 58°F | Slight Chance Drizzle | 12 to 15 mph WSW | 10% |
| Wednesday Night | 42°F | Slight Chance Drizzle then Mostly Cloudy | 10 mph WSW | 10% |
| Thursday | 61°F | Partly Sunny | 10 to 14 mph W | 8% |
| Thursday Night | 42°F | Mostly Cloudy | 5 to 8 mph NW | 7% |
| Friday | 54°F | Partly Sunny | 7 to 10 mph NNW | 4% |
| Friday Night | 32°F | Partly Cloudy | 1 to 6 mph N | 0% |
| Saturday | 54°F | Mostly Sunny | 3 mph NW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 2 mph WNW | 1% |
| Sunday | 59°F | Sunny | 2 to 7 mph WNW | 2% |
| Sunday Night | 33°F | Clear | 2 mph WSW | 0% |
| Monday | 64°F | Sunny | 1 to 7 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 66°F | Sunny | 5 mph WNW | 1% |
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 Nov 4, 2026.