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City of SeaTac, WashingtonSeaTac, WA Weather Forecast
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| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | COLUMBUS DAY |
 |  |  |  | |  |  | | | | | |
| Partly Cloudy | Partly Sunny | Mostly Clear | Sunny | Partly Cloudy | Chance of Showers | Chance of Rain | Chance of Rain | Partly Cloudy | Sunny | Mostly Clear | Sunny |
| Lo: 46°FLo: 8°C | Hi: 65°FHi: 18°C | Lo: 46°FLo: 8°C | Hi: 66°FHi: 19°C | Lo: 50°FLo: 10°C | Hi: 63°FHi: 17°C | Lo: 45°FLo: 7°C | Hi: 60°FHi: 16°C | Lo: 43°FLo: 6°C | Hi: 60°FHi: 16°C | Lo: 40°FLo: 4°C | Hi: 61°FHi: 16°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 236 PM PDT Tue Oct 06 2026 
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Issued: 833 PM PDT Tue Oct 6 2026
Aviation
... A flat upper ridge remains over region with westerly flow aloft. The low level flow is light northerly or weakly offshore. Stratus never fully cleared across the northern portions of Puget Sound and is expanding southward this evening. With weak surface gradients and already narrow temperature dew point spreads, the low levels are primed for widespread (albeit shallow) formation of LIFR low cloud and restricted surface visibility overnight into Wednesday morning. These conditions wil...