Grayslake, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grayslake, a village in Lake County, Illinois.
Overnight
60°F
Rain Showers
Rain showers. Cloudy. Low around 60, with temperatures rising to around 64 overnight. South 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 Grayslake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 60°F | Rain Showers | 15 mph S | 79% |
| Wednesday | 64°F | Chance Rain Showers | 15 mph SSW | 39% |
| Wednesday Night | 46°F | Mostly Cloudy | 15 mph SW | 13% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph WSW | 50% |
| Thursday Night | 39°F | Rain Showers Likely | 10 to 15 mph NNW | 56% |
| Friday | 49°F | Mostly Cloudy | 10 to 15 mph NNW | 12% |
| Friday Night | 34°F | Partly Cloudy | 5 to 10 mph NNW | 2% |
| Saturday | 51°F | Mostly Sunny | 5 mph NW | 0% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 5% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph W | 1% |
| Monday | 60°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 40°F | Partly Cloudy | 5 mph WSW | 1% |
| Tuesday | 61°F | Sunny | 5 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Grayslake (42.341, -88.034). Updated through the day.
Growing snapshot for Grayslake
Last spring frost
Apr 29
First fall frost
Oct 20
Growing season
172 days
Hardiness zone
5b
More local growing data for Grayslake: nearby ZIP 60030 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Antioch
Bannockburn
Beach Park
Buffalo Grove
Burtons Bridge
Deer Park
Deerfield
Forest Lake
Fox Lake
Fox Lake Hills
Gages Lake
Grandwood Park
Green Oaks
Gurnee
Hainesville
Hawthorn Woods
Highland Park
Highwood
Holiday Hills
Indian Creek
Island Lake
Kildeer
Knollwood
Lake Bluff
Lake Forest
Lake Villa
Lake Zurich
Libertyville
Lincolnshire
Lindenhurst
Climate data from the nearest NOAA station, Mundelein 4 Wsw, Il (5.8 mi from Grayslake). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.