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City of Belvidere, ILBelvidere, IL Weather Forecast
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Belvidere Weather Forecast
| THIS AFTERNOON | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
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| Chance of Showers | Mostly Cloudy | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Showers Likely | Chance of Showers | Mostly Cloudy | Mostly Cloudy |
| Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 61°FLo: 16°C | Hi: 71°FHi: 22°C | Lo: 61°FLo: 16°C | Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 61°FHi: 16°C | Lo: 51°FLo: 11°C | Hi: 61°FHi: 16°C | Lo: 50°FLo: 10°C |
| POP: 20% | POP: 20% | POP: 90% | POP: 100% | POP: 80% | POP: 70% | POP: 50% | POP: 60% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 121 PM CDT Thu Sep 17 2026 
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Issued: 158 PM CDT Thu Sep 17 2026
Key Messages
- A brief break in the pattern is expected tomorrow afternoon through Friday before another period of wet weather materializes this weekend. Localized flash flooding will be possible where the heaviest rain sets up.
Discussion
... Issued at 158 PM CDT Thu Sep 17 2026
A diffuse front/differential heating zone in the vicinity of I-90/88 continues to slowly work its way southward early this afternoon. To the north of the boundary, persistent low stratus has held temperatures in the upper 60s...