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Lost Lake, IL Weather Forecast
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Lost Lake Weather Forecast
| TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | FRIDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Chance of Showers | Showers | Showers | Chance of Showers | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Cloudy |
| Lo: 65°FLo: 18°C | Hi: 70°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 61°FHi: 16°C | Hi: 65°FHi: 18°C Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C Lo: 51°FLo: 11°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C |
| POP: 100% | POP: 70% | POP: 50% | POP: 70% | POP: 60% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 536 PM CDT Sat Sep 19 2026 
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Issued: 627 PM CDT Sat Sep 19 2026
Key Messages
- An increasingly synoptic supported heavy rain set up continues to evolve today, just hours following this dissipation of last night`s heavy rain MCS.
- Heavy rains will again break out tonight, especially along and north of I-80 and near and south of Highway 20. This area is already saturated, and is broadly included in a Flood Watch until 7 AM Sunday.
- The Marginal risk for isolated severe storms was added back to the area by SPC, but this risk remains conditional and low in our area.