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Summit Lake Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  | |  | |  |  | |  | | |  |
| Partly Cloudy | Partly Cloudy | Partly Cloudy | Patchy Fog | Partly Cloudy | Chance of Rain | Rain | Rain | Rain and Snow | Partly Cloudy | Rain and Snow | Chance of Snow |
| Lo: 36°FLo: 2°C | Hi: 60°FHi: 16°C | Lo: 36°FLo: 2°C | Hi: 60°FHi: 16°C | Lo: 36°FLo: 2°C | Hi: 60°FHi: 16°C | Lo: 36°FLo: 2°C | Hi: 45°FHi: 7°C | Lo: 26°FLo: -3°C | Hi: 45°FHi: 7°C | Lo: 26°FLo: -3°C | Hi: 46°FHi: 8°C |
| POP: 20% | POP: 90% | POP: 80% | POP: 60% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1254 PM MDT Mon Oct 19 2026 
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Issued: 1238 PM MDT Mon Oct 19 2026
Discussion
...
KEY MESSAGES:- Mild conditions continue through Thursday.
- Patchy valley fog in the mornings, especially in narrow valleys.
- Significant change coming Friday into the weekend.
A weak, but broad ridge over the region combined with less solar heating this time of year is causing very stable conditions across the region. While this is causing overall mild weather and sunny afternoons, it`s also allowing valley cold pools to develop with intermittent fog in the mornings. This is expected to...