Johnsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Johnsburg, a village in Mchenry County, Illinois.
Overnight
62°F
Mostly Clear
Mostly clear, with a low around 62. South southwest wind around 5 mph.
7-day forecast for Johnsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Mostly Clear | 5 mph SSW | 0% |
| Tuesday | 84°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Tuesday Night | 66°F | Mostly Cloudy then Chance Showers And Thunderstorms | 0 to 5 mph SW | 56% |
| Wednesday | 78°F | Showers And Thunderstorms Likely | 0 to 5 mph WSW | 74% |
| Wednesday Night | 61°F | Showers And Thunderstorms | 0 to 5 mph WNW | 76% |
| Thursday | 78°F | Chance Rain Showers | 0 to 5 mph NNE | 49% |
| Thursday Night | 59°F | Partly Cloudy | 0 to 5 mph NE | 14% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph E | 3% |
| Friday Night | 62°F | Mostly Clear | 0 to 5 mph SSW | 7% |
| Saturday | 84°F | Mostly Sunny | 0 to 5 mph SW | 11% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SW | 22% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 22% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 0 to 10 mph SW | 45% |
| Monday | 84°F | Chance Rain Showers | 0 to 5 mph SSW | 45% |
Forecast source: National Weather Service (api.weather.gov) for Johnsburg (42.383, -88.247). Updated through the day.
Growing snapshot for Johnsburg
Last spring frost
May 1
First fall frost
Oct 11
Growing season
162 days
Hardiness zone
5b
More local growing data for Johnsburg: nearby ZIP 60051 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Mc Henry -Wg Stratton L&D, Il (3.3 mi from Johnsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.