Weather Alert
Grayslake Weather Warning NWS WEATHER ALERT FOR THE GRAYSLAKE, IL AREA - Issued: 326 PM CDT Sun Sep 13 2026 Grayslake Weather Warning

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Grayslake, IL Weather Forecast

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Grayslake, IL Weather Forecast

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Grayslake IL weather - Clear - 46°F
Clear
46°F
Updated 1:58 am
Feels Like 53°F
Humidity 100%
Wind W 3 mph
Barometer  30.22 in
Dew Point 46°F
Grayslake IL weather - Clear - 8°C
Clear
8°C
Updated 1:58 am
Feels Like 11°C
Humidity 100%
Wind W 5 km/h
Barometer  102.3 kPa
Dew Point 8°C
WX Settings

Grayslake Weather Forecast

OVERNIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY
Grayslake, IL Weather - Overnight Patchy Fog Grayslake, IL Weather - Monday Chance Of Showers Grayslake, IL Weather - Monday Night Chance Of T-Storm Grayslake, IL Weather - Tuesday Chance Of T-Storm Grayslake, IL Weather - Tuesday Night Chance Of T-Storm Grayslake, IL Weather - Wednesday Chance Of T-Storm Grayslake, IL Weather - Wednesday Night Chance Of T-Storm Grayslake, IL Weather - Thursday Chance Of T-Storm Grayslake, IL Weather - Thursday Night Mostly Cloudy Grayslake, IL Weather - Friday Chance Of Showers Grayslake, IL Weather - Friday Night Chance Of Showers Grayslake, IL Weather - Saturday Showers Likely
Patchy Fog Chance of Showers Chance of T-Storm Chance of T-Storm Chance of T-Storm Chance of T-Storm Chance of T-Storm Chance of T-Storm Mostly Cloudy Chance of Showers Chance of Showers Showers Likely
Lo: 49°FLo: 9°C Hi: 75°FHi: 24°C
 Lo: 65°FLo: 18°C Hi: 81°FHi: 27°C
 Lo: 60°FLo: 16°C Hi: 71°FHi: 22°C
 Lo: 65°FLo: 18°C Hi: 75°FHi: 24°C
 Lo: 61°FLo: 16°C Hi: 75°FHi: 24°C
 Lo: 61°FLo: 16°C Hi: 79°FHi: 26°C
POP: 20% POP: 60% POP: 70% POP: 50% POP: 70% POP: 70% POP: 50% POP: 40% POP: 50% POP: 60%
POP = Probability of Precipitation.
Weather Outlook Updated: 1151 PM CDT Sun Sep 13 2026 Grayslake, IL Weather - WeatherWorld.com

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Issued: 1242 AM CDT Mon Sep 14 2026

Key Messages

  • Waves of heavy rain producing thunderstorms possible in the general region Tuesday through Thursday.

Discussion

... Issued at 230 PM CDT Sun Sep 13 2026

Modest forcing from an axis of mid-level frontogenesis within the right entrance of a 90 knot mid-level jet streak over southern Wisconsin into extreme northern Illinois is supporting a band of rain dragging across northern Illinois early this afternoon. Precip intensity aloft has been strong enough to overcome a fairly dry low-level ai...