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Separation Lake Weather Forecast
| THIS AFTERNOON | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
 |  |  |  | | |  |  |  | | | |
| Mostly Sunny | Mostly Cloudy | Partly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Chance of Rain | Chance of Rain | Chance of T-Storm | Chance of Rain | Mostly Sunny | Partly Cloudy |
| POP: 40% | POP: 50% | POP: 50% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1128 AM PDT Mon Sep 21 2026 
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Issued: 1115 AM PDT Mon Sep 21 2026
Aviation
...Through 18Z Tuesday...As of 18Z Monday, low marine stratus had dissipated along the coast but remains in place through the interior lowlands with ceilings ranging from 600-1500 feet, highest around the Portland metro and lowest in the southern Willamette Valley. Stratus will continue to erode as daytime heating increases and northerly winds help mix out the cloud cover between 19-21Z for most locations, exact timing remains uncertain. VFR conditions return to all terminals by this aft...