Surprise Lake, MT Weather Forecast
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Surprise Lake Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
| Rain Showers | Chance of T-Storm | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm |
| Lo: 45°FLo: 7°C | Hi: 85°FHi: 29°C | Lo: 45°FLo: 7°C | Hi: 79°FHi: 26°C | Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C | Lo: 41°FLo: 5°C | Hi: 75°FHi: 24°C | Lo: 41°FLo: 5°C | Hi: 75°FHi: 24°C | Lo: 40°FLo: 4°C | Hi: 75°FHi: 24°C |
| POP: 20% | POP: 20% | POP: 50% | POP: 50% | POP: 60% | POP: 30% | POP: 30% | POP: 40% | POP: 40% | POP: 30% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 508 PM MDT Thu Aug 20 2026 

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Surprise Lake Forecast Discussion
Issued: 539 PM MDT Thu Aug 20 2026
Key Messages
- Hot and mostly dry today through Friday.
- Weather system brings the chance of precipitation back to the region Saturday and Sunday. The risk of severe thunderstorms is low. Thunderstorms could produce heavy rainfall.
- Drier with an occasional chance of precipitation next week.
Discussion
...
Today through Wednesday...
Today and Friday will be hot and mostly dry as a ridge of high pressure builds in aloft. High temperatures during this time will be in the 80s a...
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