Eureka, IL Weather Forecast
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Eureka Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY |
| Mostly Cloudy | Partly Cloudy | Partly Sunny | Mostly Cloudy | Partly Sunny | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers |
| Hi: 75°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C |
| POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 637 AM CDT Mon Oct 26 2026 

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Issued: 557 AM CDT Mon Oct 26 2026
Key Messages
- Continued above-normal warmth and dry conditions are expected through Friday, with afternoon temperatures in the 70s to near 80 degrees solidifying one of the warmest Octobers on record.
- Scattered, light showers have a low chance (10-30%) Thursday, primarily near and north of Interstate 72, offering no significant relief to ongoing dry conditions.
- A pattern shift is favored by next weekend and early November, bringing higher confidence in cooler, breezier, and wetter weather.
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