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Mercer, IL Weather Forecast
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Mercer Weather Forecast
| REST OF TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | WEDNESDAY |
 |  |  |  |  |  | | |  | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of Showers | Clearing | Sunny | Clear | Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear |
| Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 51°FHi: 11°C | Lo: 35°FLo: 2°C | Hi: 55°FHi: 13°C | Hi: 65°FHi: 18°C Lo: 39°FLo: 4°C | Hi: 65°FHi: 18°C Lo: 39°FLo: 4°C | Lo: 41°FLo: 5°C | Hi: 69°FHi: 21°C Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C Lo: 45°FLo: 7°C | Hi: 71°FHi: 22°C Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C Lo: 49°FLo: 9°C |
| POP: 90% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 906 AM CDT Thu Oct 15 2026 
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Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 1223 PM CDT Thu Oct 15 2026
Key Messages
- A widespread rain will occur through early evening with possibly a rumble of thunder. No severe storms are expected.
- A strong cold front will sweep through the area tonight bringing very windy conditions into Friday. Wind gusts up to 45 mph are possible.
- Frost is a certainty across the area late Friday night into Saturday morning. The probability of a light freeze north of Highway 30 are now 50-60 percent.
Aviation
/18Z TAFS THROUGH 18Z FRIDAY/... Issued at 1219 PM CDT Thu Oct 15 2026
A...