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
61°F
Slight Chance Drizzle
A slight chance of drizzle. Cloudy. High near 61, with temperatures falling to around 56 in the afternoon. West southwest wind 12 to 15 mph, with gusts as high as 25 mph.
7-day forecast for South Jacksonville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 61°F | Slight Chance Drizzle | 12 to 15 mph WSW | 10% |
| Tonight | 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% |
| Tuesday Night | 40°F | Partly Cloudy | 1 mph NNE | 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.