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Big Lake Weather Forecast
| THIS AFTERNOON | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  |  |  |  |  | | |  | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of Showers | Partly Cloudy | Sunny | Clear | Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Sunny | Mostly Clear |
| Hi: 71°FHi: 22°C | Lo: 45°FLo: 7°C | Hi: 55°FHi: 13°C | Lo: 35°FLo: 2°C | Hi: 59°FHi: 15°C | Hi: 69°FHi: 21°C Lo: 39°FLo: 4°C | Hi: 69°FHi: 21°C Lo: 39°FLo: 4°C | Lo: 41°FLo: 5°C | Hi: 70°FHi: 21°C Lo: 45°FLo: 7°C | Hi: 70°FHi: 21°C Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C | Hi: 79°FHi: 26°C Lo: 49°FLo: 9°C |
| POP: 50% | POP: 50% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 227 PM CDT Thu Oct 15 2026 
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Issued: 112 PM CDT Thu Oct 15 2026
Key Messages
- A few strong/severe thunderstorms remain possible in southwest Illinois from early to mid afternoon, with damaging wind gusts and a brief tornado possible. For other areas, the threat of severe storms is low.
- A strong cold front will bring blustery northwest winds an a sharp cooldown overnight. Below average temperatures are expected through Saturday, with morning frost increasingly likely Saturday and Sunday mornings.
- A steady warmup is expected Sunday onward.
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