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Matanzas Lake, IL Weather Forecast
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Matanzas Lake Weather Forecast
| THIS AFTERNOON | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | SUNDAY NIGHT | LABOR DAY |
 |  | | | | | |  |  |  | | |
| Sunny | Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Chance of Showers | Partly Cloudy | Partly Cloudy |
| Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C | Hi: 95°FHi: 35°C Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 90°FHi: 32°C | Hi: 85°FHi: 29°C Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C Lo: 69°FLo: 21°C |
| POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 117 PM CDT Tue Sep 01 2026 
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Issued: 1226 PM CDT Tue Sep 1 2026
Key Messages
- Dangerous Heat Wave Continues: Highs reaching the mid-90s to near 100 degrees will combine with lingering humidity to produce heat index values of 100 to 105+ degrees through Saturday. Highest probabilities (40-80%) for triple-digit heat focus south of I-74 through Wednesday.
- Isolated Storm Threat: A low probability (less than 20%) exists Thursday for an isolated pop-up afternoon or evening thunderstorm. While coverage will be sparse, strong instability could support an isolated seve...