Jacksonville, IL Weather & Growing Conditions
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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Mostly Cloudy | 12 mph WSW | 12% |
| Wednesday | 58°F | Slight Chance Drizzle | 12 to 16 mph WSW | 10% |
| Wednesday Night | 42°F | Slight Chance Drizzle then Mostly Cloudy | 10 mph WSW | 10% |
| Thursday | 61°F | Mostly Cloudy | 10 to 14 mph W | 9% |
| Thursday Night | 42°F | Mostly Cloudy | 7 mph NW | 8% |
| Friday | 54°F | Partly Sunny | 7 to 10 mph NNW | 4% |
| Friday Night | 32°F | Partly Cloudy | 0 to 6 mph N | 0% |
| Saturday | 54°F | Mostly Sunny | 0 to 3 mph NW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 1 mph WNW | 1% |
| Sunday | 59°F | Sunny | 1 to 7 mph W | 2% |
| Sunday Night | 33°F | Clear | 2 mph WSW | 0% |
| Monday | 64°F | Sunny | 1 to 7 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 66°F | Sunny | 3 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Jacksonville, IL
Last spring frost
Apr 19
First fall frost
Oct 17
Growing season
179 days
Hardiness zone
6a
Explore more for Jacksonville, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Jacksonville 2E, Il (1.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.