Weather WorldRock Lake, IN Weather Forecast
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Rock Lake Weather Forecast
| REST OF TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  | | |  |  |  |  | | | |  |
| Partly Cloudy | Chance of T-Storm | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Chance of Showers |
| Hi: 79°FHi: 26°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°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: 61°FLo: 16°C |
| POP: 20% | POP: 50% | POP: 40% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 928 AM EDT Thu Aug 20 2026 
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Rock Lake Forecast Discussion
Issued: 746 AM EDT Thu Aug 20 2026
Key Messages
- Mostly dry today with only a slight chance (20 percent) for isolated showers and storms in the late afternoon and early evening. Severe weather is not expected. Highs around 80 degrees.
- The next chance for showers and storms will be late Friday afternoon into Sunday morning. The best chances (50-75 percent) will be Saturday afternoon east of Interstate 69. Elsewhere, expect closer to 30-50 percent chance. Severe weather is not expected.
- Hazardous swimmin...