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Olalla Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
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| Patchy Fog | Patchy Fog | Patchy Fog | Partly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers |
| Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C | Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C | Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C | Hi: 67°FHi: 19°C | Lo: 50°FLo: 10°C | Hi: 63°FHi: 17°C | Lo: 50°FLo: 10°C | Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 236 AM PDT Sun Sep 20 2026 
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Issued: 302 AM PDT Sun Sep 20 2026
Aviation
... West-southwesterly flow prevails over the area with broad troughing over the northeast Pacific. Otherwise mostly clear skies early this morning with light winds has promoted the development of fog in the valleys across western Washington. Stratus will continue to slowly build along the immediate coastline, as well. Several area terminals, including OLM, are already experiencing LIFR conditions due to fog, and this will continue to slowly develop across the remaining area terminals th...