Johnsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Johnsburg, a village in Mchenry County, Illinois.
Tonight
47°F
Areas Of Drizzle
Areas of drizzle. Cloudy. Low around 47, with temperatures rising to around 49 overnight. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
7-day forecast for Johnsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 47°F | Areas Of Drizzle | 10 to 15 mph SW | 40% |
| Thursday | 51°F | Rain Showers Likely | 10 to 15 mph W | 67% |
| Thursday Night | 37°F | Chance Rain then Mostly Cloudy | 10 mph N | 33% |
| Friday | 48°F | Partly Sunny | 10 to 15 mph NNW | 1% |
| Friday Night | 30°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 58°F | Sunny | 5 mph W | 1% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 61°F | Sunny | 0 to 10 mph WSW | 0% |
| Monday Night | 39°F | Mostly Clear | 0 to 5 mph WSW | 0% |
| Tuesday | 61°F | Sunny | 0 to 5 mph WNW | 1% |
| Tuesday Night | 37°F | Partly Cloudy | 0 mph | 1% |
| Veterans Day | 59°F | Mostly Sunny | 0 to 5 mph NW | 2% |
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 Nov 5, 2026.