Commonwealth Lake Park, OR Weather Forecast
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Commonwealth Lake Park Weather Forecast
| TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
| Mostly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Cloudy | Chance of Rain | Partly Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy |
| Hi: 85°FHi: 29°C | Lo: 59°FLo: 15°C | Hi: 89°FHi: 32°C | Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 85°FHi: 29°C | Lo: 55°FLo: 13°C |
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 501 AM PDT Wed Aug 19 2026 

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Commonwealth Lake Park Forecast Discussion
Issued: 438 AM PDT Wed Aug 19 2026
Discussion
...Today through Tuesday...Dry and warm weather continues today and tomorrow as an upper-level ridge amplifies over the Rockies and Great Basin. Expect high temperatures near or slightly above average for this time of year, with mid 80s this afternoon across inland valleys and 60s along the coast. Highs for inland valleys increase slightly into the upper 80s as the upper ridge reaches its peak strength. Onshore flow continues as broad upper-level troughing...
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