Johnsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Johnsburg, a village in Mchenry County, Illinois.
Tonight
60°F
Chance Showers And Thunderstorms
A slight chance of rain showers before midnight, then a chance of showers and thunderstorms between midnight and 1am, then showers and thunderstorms likely between 1am and 5am, then showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 60. East southeast wind 10 to 15 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Johnsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Chance Showers And Thunderstorms | 10 to 15 mph ESE | 76% |
| Saturday | 75°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 to 15 mph ESE | 96% |
| Saturday Night | 62°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NE | 78% |
| Sunday | 66°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 69% |
| Sunday Night | 54°F | Chance Rain Showers | 15 mph ENE | 42% |
| Monday | 63°F | Chance Rain Showers | 15 mph ENE | 39% |
| Monday Night | 50°F | Chance Rain Showers | 5 to 15 mph ENE | 39% |
| Tuesday | 62°F | Slight Chance Rain Showers | 10 to 15 mph NE | 20% |
| Tuesday Night | 50°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 15% |
| Wednesday | 64°F | Partly Sunny | 5 to 10 mph NE | 9% |
| Wednesday Night | 50°F | Mostly Cloudy | 0 to 5 mph NNE | 5% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph NNE | 5% |
| Thursday Night | 51°F | Mostly Cloudy | 0 to 5 mph NNE | 5% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph NNE | 5% |
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 Sep 19, 2026.