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Merriam, IL Weather Forecast
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Merriam Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  |  | |  | | | | |  |  | |
| Chance of T-Storm | Mostly Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Chance of Showers | Chance of Showers | Partly Cloudy |
| Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 91°FHi: 33°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Hi: 95°FHi: 35°C Lo: 69°FLo: 21°C | Hi: 95°FHi: 35°C Lo: 69°FLo: 21°C | Hi: 95°FHi: 35°C Lo: 69°FLo: 21°C | Lo: 70°FLo: 21°C | Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C |
| POP: 50% | POP: 30% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 507 PM CDT Fri Sep 11 2026 
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Issued: 618 PM CDT Fri Sep 11 2026
Key Messages
- Scattered to numerous showers and thunderstorms are expected to develop late this afternoon and evening, decreasing overnight. A low end threat for a few severe storms (5% chance) is in place for late this afternoon and evening for areas along the KY/TN border and the MO bootheel.
- There is a small chance (20-30%) of a few lingering showers on Saturday, mainly in the Kentucky Pennyrile and southwest Indiana. Otherwise, the weekend through mid next week looks dry. Our next chance for r...