Illinois · NWS LOT office
Grayslake, IL weather
It is 54°F and clear at Chicago/Waukegan Regional Airport as of Oct 28, 4:05 AM CDT. Overnight: Mostly Clear, low near 51°F, 1% chance of precipitation. Forecast from the National Weather Service, issued Oct 28, 3:35 AM CDT.
Current conditions
Temperature
54°F
Clear
Wind
SW 7 mph
Humidity 82% · dew point 48°F
Pressure · visibility
30.18 inHg
Visibility 10 mi
Observed at Chicago/Waukegan Regional Airport (KUGN), Oct 28, 4:05 AM CDT. Station readings can lag or be missing.
Alerts for this area
No active NWS alerts cover the Grayslake forecast zone right now.
Around the NWS LOT forecast area
No active alerts in zones served by the LOT office near Grayslake.
From the alert snapshot of Oct 28, 2026, 5:12 AM EDT. No alerts are active anywhere in Illinois.
For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.
Next 24 hours
| Time | Temp | Forecast | Precip. chance | Wind |
|---|---|---|---|---|
| Wed 6 AM | 52°F | Sunny | 0% | 0 mph |
| Wed 7 AM | 51°F | Sunny | 0% | 0 mph |
| Wed 8 AM | 52°F | Sunny | 0% | SSW 5 mph |
| Wed 9 AM | 56°F | Sunny | 0% | SSW 5 mph |
| Wed 10 AM | 62°F | Sunny | 0% | SSW 5 mph |
| Wed 11 AM | 65°F | Sunny | 0% | SSW 10 mph |
| Wed 12 PM | 68°F | Sunny | 0% | SSW 10 mph |
| Wed 1 PM | 70°F | Sunny | 0% | S 10 mph |
| Wed 2 PM | 72°F | Sunny | 0% | S 10 mph |
| Wed 3 PM | 72°F | Sunny | 0% | S 15 mph |
| Wed 4 PM | 71°F | Sunny | 0% | S 10 mph |
| Wed 5 PM | 69°F | Sunny | 1% | S 10 mph |
| Wed 6 PM | 66°F | Partly Cloudy | 1% | S 10 mph |
| Wed 7 PM | 64°F | Mostly Clear | 4% | S 10 mph |
| Wed 8 PM | 62°F | Mostly Clear | 4% | S 10 mph |
| Wed 9 PM | 62°F | Mostly Clear | 3% | S 10 mph |
| Wed 10 PM | 62°F | Mostly Clear | 4% | S 10 mph |
| Wed 11 PM | 61°F | Mostly Clear | 5% | SSW 15 mph |
| Thu 12 AM | 61°F | Mostly Clear | 7% | SSW 15 mph |
| Thu 1 AM | 61°F | Partly Cloudy | 11% | SSW 15 mph |
| Thu 2 AM | 61°F | Mostly Cloudy | 12% | SSW 15 mph |
| Thu 3 AM | 61°F | Slight Chance Rain Showers | 19% | SSW 15 mph |
| Thu 4 AM | 60°F | Slight Chance Rain Showers | 23% | SW 15 mph |
| Thu 5 AM | 60°F | Chance Rain Showers | 28% | SW 15 mph |
Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Grayslake can differ.
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7-day forecast
Overnight
Low 51°F
Mostly clear, with a low around 51. South southwest wind 0 to 5 mph.
Wednesday
High 72°F·Low 58°F
Sunny. High near 72, with temperatures falling to around 69 in the afternoon. South southwest wind 0 to 15 mph.
Wednesday Night: A chance of rain showers after 3am. Partly cloudy. Low around 58, with temperatures rising to around 60 overnight. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Thursday
High 69°F·Low 42°F
A slight chance of rain showers before 8am. Mostly sunny, with a high near 69. West wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Thursday Night: Mostly clear, with a low around 42. North northwest wind 0 to 5 mph.
Friday
High 61°F·Low 49°F
Partly sunny, with a high near 61.
Friday Night: A chance of rain showers after 7pm. Cloudy, with a low around 49.
Saturday
High 61°F·Low 49°F
A chance of rain showers. Cloudy, with a high near 61.
Saturday Night: A chance of rain showers. Cloudy, with a low around 49.
Sunday
High 66°F·Low 51°F
A chance of rain showers. Mostly cloudy, with a high near 66.
Sunday Night: A chance of rain showers. Mostly cloudy, with a low around 51.
Monday
High 66°F·Low 52°F
A chance of rain showers. Mostly cloudy, with a high near 66.
Monday Night: A chance of rain showers. Mostly cloudy, with a low around 52.
Tuesday
High 65°F
Rain showers likely. Mostly cloudy, with a high near 65.
Nearby cities
- Round Lake Beach, IL 4 mi
- Mundelein, IL 5 mi
- Libertyville, IL 5 mi
- Gurnee, IL 5 mi
- Vernon Hills, IL 8 mi
- Waukegan, IL 9 mi
- North Chicago, IL 9 mi
- Zion, IL 12 mi
Larger cities in the area
- Chicago, IL 39 mi · pop. 2,721,308
- Aurora, IL 42 mi · pop. 180,710
- Milwaukee, WI 50 mi · pop. 563,531
- Madison, WI 88 mi · pop. 285,300
Other cities in Lake County
- Waukegan
- Buffalo Grove
- Mundelein
- Highland Park
- North Chicago
- Gurnee
- Round Lake Beach
- Vernon Hills
- Zion
- Libertyville
See every city we cover in Illinois, or check all active alerts.
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About this forecast
- Forecast office
- Grayslake is served by the National Weather Service LOT forecast office, forecast zone ILZ006, county zone ILC097.
- Location used
- The Census Bureau's internal point for Grayslake (42.3408, -88.0336), in Lake County. Population: 21,262 (2024 estimate), number 113 of the 121 Illinois cities on this site.
- Radar
- Nearest NWS radar: KMKX. View it on radar.weather.gov.
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Sources
- Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/42.3408,-88.0336 (forecast issued Oct 28, 3:35 AM CDT).
- Official forecast page: forecast.weather.gov.
- City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
- Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.
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