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Rock River, IL Weather Forecast
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Rock River Weather Forecast
| TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  | | | | | |  | | |  | |
| Clear | Sunny | Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Partly Cloudy | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Sunny |
| Lo: 35°FLo: 2°C | Hi: 61°FHi: 16°C | Lo: 39°FLo: 4°C | Hi: 69°FHi: 21°C | Lo: 41°FLo: 5°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C | Lo: 50°FLo: 10°C | Hi: 71°FHi: 22°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 705 PM CDT Sat Oct 17 2026 
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Issued: 540 PM CDT Sat Oct 17 2026
Key Messages
- Frost is expected tonight across northwest Indiana and especially east of I-55 in Illinois.
- An extended period of dry and unseasonably mild weather is expected the upcoming work week and likely into next weekend as well.
Discussion
... Issued at 127 PM CDT Sat Oct 17 2026
Following a chilly start to the day, sunny skies are boosting temperatures back through the 50s early this afternoon. Meanwhile, light winds (~5 mph or less) to nearly calm conditions persist as the center of surface h...