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Lake Murphysboro Weather Forecast
| OVERNIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  | | |  | |  |  | | | |
| Partly Cloudy | Sunny | Clear | Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of Showers | Showers Likely | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 89°FHi: 32°C Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Hi: 71°FHi: 22°C Lo: 60°FLo: 16°C | Hi: 71°FHi: 22°C Lo: 60°FLo: 16°C |
| POP: 50% | POP: 60% | POP: 50% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Mon Sep 28 2026 
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Issued: 204 AM CDT Mon Sep 28 2026
Key Messages
- It will be a cool start to the week, but the heat will return for Wednesday and Thursday, when high temperatures will climb into the upper 80s to around 90 degrees.
- A cold front will bring a 40-60% chance of showers as it passes through the Quad State late Thursday through Friday morning. Chances of showers will linger through the weekend, with a slight chance of thunderstorms mixed in Sunday afternoon.
Discussion
... Issued at 204 AM CDT Mon Sep 28 2026
Surface high pressure will linge...