Johnsonville, IL Weather & Growing Conditions
Overnight
70°F
Mostly Clear
Mostly clear. Low around 70, with temperatures rising to around 73 overnight. South southeast wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Mostly Clear | 1 mph SSE | 2% |
| Saturday | 98°F | Sunny | 1 to 7 mph SW | 6% |
| Saturday Night | 72°F | Partly Cloudy | 5 mph SSW | 3% |
| Sunday | 95°F | Mostly Sunny | 3 to 7 mph W | 4% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms | 8 mph NNE | 48% |
| Monday | 82°F | Showers And Thunderstorms Likely | 7 to 12 mph NE | 62% |
| Monday Night | 58°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 6 to 13 mph NNE | 62% |
| Tuesday | 74°F | Chance Showers And Thunderstorms | 12 mph NNE | 26% |
| Tuesday Night | 55°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 12 mph N | 21% |
| Wednesday | 75°F | Mostly Sunny | 6 to 10 mph N | 4% |
| Wednesday Night | 55°F | Partly Cloudy | 3 to 10 mph N | 2% |
| Thursday | 77°F | Mostly Sunny | 3 to 9 mph N | 2% |
| Thursday Night | 56°F | Partly Cloudy | 2 to 8 mph NNE | 4% |
| Friday | 78°F | Mostly Sunny | 2 to 9 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Johnsonville, IL
Last spring frost
Apr 9
First fall frost
Oct 24
Growing season
198 days
Hardiness zone
6b
Explore more for Johnsonville, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Flora, Il (14.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.