McHenry, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for McHenry, a city in Mchenry County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
7-day forecast for McHenry
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SW | 0% |
| Tonight | 67°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 NW | 77% |
| Thursday | 78°F | Chance Rain Showers | 0 to 5 mph NE | 50% |
| Thursday Night | 60°F | Partly Cloudy | 0 to 5 mph NE | 14% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SE | 3% |
| Friday Night | 62°F | Mostly Clear | 0 to 5 mph SSW | 7% |
| Saturday | 83°F | Mostly Sunny | 0 to 5 mph SW | 11% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SW | 21% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 21% |
| 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% |
| Monday Night | 67°F | Chance Showers And Thunderstorms | 5 mph WNW | 46% |
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
Nearby towns & communities
Algonquin
Bull Valley
Cary
Chemung
Coral
Crystal Lake
Fox River Grove
Franklinville
Greenwood
Harmony
Hartland
Harvard
Hebron
Huntley
Johnsburg
Lake Barrington
Lake in the Hills
Lakemoor
Lakewood
Lawrence
Marengo
McCullom Lake
Oakwood Hills
Prairie Grove
Richmond
Ridgefield
Riley
Ringwood
Solon Mills
Spring Grove
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 Aug 4, 2026.