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Grass Lake, IL Weather Forecast

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Grass Lake, IL Weather Forecast

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Grass Lake IL weather - Clear - 58°F
Clear
58°F
Updated 7:32 pm
Feels Like 58°F
Humidity 71%
Wind N 0 mph
Barometer  30.16 in
Dew Point 48°F
Grass Lake IL weather - Clear - 14°C
Clear
14°C
Updated 7:32 pm
Feels Like 15°C
Humidity 71%
Wind N 0 km/h
Barometer  102.1 kPa
Dew Point 9°C
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Grass Lake Weather Forecast

TONIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY THURSDAY FRIDAY FRIDAY NIGHT SATURDAY
Grass Lake, IL Weather - Tonight Clear Grass Lake, IL Weather - Sunday Sunny Grass Lake, IL Weather - Sunday Night Mostly Clear Grass Lake, IL Weather - Monday Sunny Grass Lake, IL Weather - Monday Night Clear Grass Lake, IL Weather - Tuesday Clear Grass Lake, IL Weather - Tuesday Night Clear Grass Lake, IL Weather - Wednesday Mostly Clear Grass Lake, IL Weather - Thursday Mostly Clear Grass Lake, IL Weather - Friday Mostly Clear Grass Lake, IL Weather - Friday Night Clear Grass Lake, IL Weather - Saturday Clear
Clear Sunny Mostly Clear Sunny Clear Clear Clear Mostly Clear Mostly Clear Mostly Clear Clear Clear
Lo: 49°FLo: 9°C Hi: 75°FHi: 24°C
 Lo: 45°FLo: 7°C Hi: 70°FHi: 21°C
 Lo: 45°FLo: 7°C Hi: 75°FHi: 24°C
Lo: 51°FLo: 11°C		 Hi: 75°FHi: 24°C
Lo: 51°FLo: 11°C		 Hi: 79°FHi: 26°C
Lo: 51°FLo: 11°C		 Hi: 79°FHi: 26°C
Lo: 51°FLo: 11°C		 Hi: 79°FHi: 26°C
Lo: 51°FLo: 11°C		 Hi: 81°FHi: 27°C
Lo: 55°FLo: 13°C		 Hi: 81°FHi: 27°C
Lo: 55°FLo: 13°C
POP = Probability of Precipitation.
Weather Outlook Updated: 637 PM CDT Sat Oct 03 2026 Grass Lake, IL Weather - WeatherWorld.com

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Grass Lake Forecast Discussion

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Issued: 608 PM CDT Sat Oct 3 2026

Key Messages

  • Near to slightly above average temperatures along with dry conditions will dominate central Illinois through the rest of the weekend and into early next week.

Discussion

... Issued at 135 PM CDT Sat Oct 3 2026

The latest surface analysis has a high over Michigan and frontal boundary stationary extending southwest from the mid Atlantic through the Southeast to Texas. An upper level wave will pass through the Dakotas today and through MN/WI/MI tonight. The southern extent of precipitation...