McHenry, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for McHenry, a city in Mchenry County, Illinois.
Today
63°F
Scattered Rain Showers then Patchy Drizzle
Scattered rain showers before 10am, then patchy drizzle and isolated rain showers. Mostly cloudy. High near 63, with temperatures falling to around 54 in the afternoon. South southwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for McHenry
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 63°F | Scattered Rain Showers then Patchy Drizzle | 15 mph SSW | 31% |
| Tonight | 46°F | Patchy Drizzle | 15 mph SW | 17% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 35% |
| Thursday Night | 39°F | Chance Rain Showers then Mostly Cloudy | 10 mph NNW | 49% |
| Friday | 48°F | Mostly Cloudy | 10 to 15 mph NNW | 11% |
| Friday Night | 32°F | Partly Cloudy | 5 to 10 mph NNW | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 0 mph | 0% |
| Sunday | 55°F | Sunny | 0 to 10 mph W | 6% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 60°F | Mostly Sunny | 0 to 10 mph WSW | 0% |
| Monday Night | 39°F | Partly Cloudy | 0 to 5 mph WSW | 1% |
| Tuesday | 61°F | Sunny | 0 to 5 mph WNW | 0% |
| Tuesday Night | 38°F | Partly Cloudy | 0 mph | 0% |
Forecast source: National Weather Service (api.weather.gov) for McHenry (42.336, -88.292). Updated through the day.
Growing snapshot for McHenry
Last spring frost
May 1
First fall frost
Oct 11
Growing season
162 days
Hardiness zone
5b
More local growing data for McHenry: nearby ZIP 60050 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 (2.5 mi from McHenry). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.