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Source Lake Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  | | |  |  | |  | |  | | |
| Partly Cloudy | Sunny | Partly Cloudy | Sunny | Mostly Cloudy | Chance of Showers | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Mostly Cloudy | Chance of Showers |
| Lo: 35°FLo: 2°C | Hi: 59°FHi: 15°C | Lo: 39°FLo: 4°C | Hi: 61°FHi: 16°C | Lo: 41°FLo: 5°C | Hi: 59°FHi: 15°C | Hi: 65°FHi: 18°C Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C |
| POP: 20% | POP: 20% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 615 PM CDT Mon Sep 21 2026 
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Issued: 627 PM CDT Mon Sep 21 2026
Key Messages
- Widespread frost tonight away from Lake Superior with some locations falling to freezing or just below. Another round of frost expected Wednesday morning, but not as widespread.
- Persistent northeasterly winds will keep the threat for rip currents in place at Twin Port beaches this afternoon and Tuesday and may linger into mid-week as well.
- Low chances for rainfall through the forecast period.
Discussion
... Issued at 1246 PM CDT Mon Sep 21 2026
High pressure was centered just to the nor...