Johnsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Johnsburg, a village in Mchenry County, Illinois.
Tonight
59°F
Rain Showers
Rain showers. Cloudy. Low around 59, with temperatures rising to around 61 overnight. South southeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Johnsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Rain Showers | 15 mph SSE | 80% |
| Wednesday | 63°F | Rain Showers Likely | 10 to 15 mph SSW | 58% |
| Wednesday Night | 47°F | Chance Rain Showers | 15 mph SW | 25% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph WSW | 50% |
| Thursday Night | 40°F | Chance Rain Showers | 5 to 10 mph NW | 52% |
| Friday | 51°F | Slight Chance Rain Showers | 10 to 15 mph N | 22% |
| Friday Night | 34°F | Mostly Cloudy | 0 to 5 mph NNW | 4% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 5% |
| Saturday Night | 34°F | Partly Cloudy | 0 mph | 7% |
| Sunday | 57°F | Mostly Sunny then Slight Chance Rain | 0 to 5 mph W | 18% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph W | 8% |
| Monday | 60°F | Mostly Sunny | 0 to 10 mph WSW | 3% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 2% |
| Tuesday | 61°F | Mostly Sunny | 5 mph WNW | 1% |
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
Nearby towns & communities
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Lake Barrington
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McHenry
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Spring Grove
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 4, 2026.