San Juan Islands and Northern Inland Waters Marine Forecast
| Tonight...Se Wind 5 To 10 Kt, Rising To 10 To 15 Kt Late This Evening And Overnight. Waves Around 2 Ft Or Less. A Chance Of Rain. |
| Thu...Se Wind 10 To 15 Kt. Waves Around 2 Ft Or Less. A Chance Of Rain. |
| Thu Night...E Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. A Chance Of Rain In The Evening. |
| Fri...E Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. A Chance Of Rain In The Afternoon. |
| Fri Night...E Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. |
| Sat...E Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Sat Night...N Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Sun...Se Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Sun Night...E Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Mon...E Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Mon Night...Ne Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Area Forecast Discussion National Weather Service Seattle WA 229pm PDT Tuesday Oct 27 2026 Synopsis Troughing will persist over the Pacific Northwest the remainder of today with unsettled conditions and periodic showers. A frontal system will arrive tonight into Wednesday for steadier rainfall and mountain snow. An upper low then lingers over Western Washington into late week for showers and cooler temperatures. Short Term - Tonight Through Thursday Night Ongoing shower activity will continue throughout most of the area this afternoon and evening, ahead of an approaching frontal system. High temperatures this afternoon generally in the mid to upper 50s across the interior, with low 50s for areas along the water. Showers will turn into more steadier rainfall starting tonight and continuing into Wednesday morning. Southwest winds will also increase later this evening into Wednesday, peaking between 20 to 30 mph generally in the areas of the Southwest Interior through Shelton. As rainfall becomes steadier, we will also see the first widespread mountain snow event of the season unfold. A Winter Weather Advisory continues for all of the Cascade zones, with snow levels 4000 to 4500 feet dropping to 3000 to 3500 feet by Wednesday morning. Snowfall accumulations generally around 4 to 8 inches for Stevens Pass - with Snoqualmie pass seeing around 1 to 3 inches. Areas in the Southern Cascade Zone such as White Pass and Paradise will likely see higher amounts, around 6 to 12 inches of snow. Those traveling will want to be aware of the conditions and weather by checking with WSDOT for updates. Upper level troughing will continue Wednesday into Thursday for spotty showers and cooler temperatures, with high temps ranging in the low to mid 50s for most areas. Long Term - Friday Through Tuesday Ensemble guidance continues to show troughing across the Pacific Northwest through Friday, which keeps scattered showers in the forecast. Snow levels hover around 2500 to 4000 feet on Friday, so could continue to see light snow accumulations in the Cascades. The upper level trough looks to slowly move out of the area over the weekend, with a drying trend over the weekend into early next week. High temperatures look to remain in the mid 50s over the weekend. with overnight lows approaching low to mid 30s. Will continue to monitor the threat of frost or freeze conditions. Mazurkiewicz Marine Northwesterly winds along the outer coastal waters will linger into Wednesday, with wind gusts approaching 25 kt at times and a SCA (Small Craft Advisory) still in effect until late tonight. Seas will be between 8-9 feet overnight. Another frontal system will move into the waters tonight into Wednesday, increasing winds and seas across the area. Increasing onshore flow will bring a brief push of small craft westerly winds to the central and eastern Strait late this afternoon into this evening. Southerly winds are picking up along the Puget Sound waters this afternoon, with latest guidance highlighting a 60- 80% chance of gusts exceeding small craft criteria particularly in the waters from Seattle south. Winds will ease again across the area waters on Wednesday as the accompanying surface low drops into the area and tracks southward along the coastal waters. This low will allow for flow to turn back offshore, with offshore flow persisting the second part of the week. Sea conditions slowly subsiding back to 4-6 ft on Thursday and remain that way into the weekend. 21 NOAA Seattle WA Office: Watches - Warnings - Advisories WA...Winter Weather Advisory from 5pm this afternoon to 5pm PDT Wednesday for Cascades of Pierce and Lewis Counties- Cascades of Snohomish and Northern King Counties-Cascades of Southern King County-Cascades of Whatcom and Skagit Counties. PZ...Small Craft Advisory from 5pm this afternoon to 11pm PDT this evening for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca- Puget Sound and Hood Canal Small Craft Advisory until 5am PDT Wednesday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm- Coastal Waters From James Island To Point Grenville 10 To 60 Nm- Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm. |
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