San Juan Islands and Northern Inland Waters Marine Forecast
| Tonight...S Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. |
| Mon...S Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. |
| Mon Night...S Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. |
| Tue...S Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Tue Night...Sw Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Wed...Nw Wind Around 5 Kt, Rising To 5 To 10 Kt In The Afternoon. Waves Around 2 Ft Or Less. |
| Wed Night...Sw Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Thu...W Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Thu Night...Sw Wind 5 To 10 Kt, Easing To Around 5 Kt After Midnight. Waves Around 2 Ft Or Less. |
| Fri...W Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Fri Night...Sw Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Area Forecast Discussion National Weather Service Seattle WA 206pm PDT Sunday May 17 2026 Synopsis High pressure will remain situated offshore through much of next week, maintaining near-normal temperatures across western Washington with cloudy mornings and sunshine in the afternoons. A few weak systems will move over the top of the ridge towards the middle of next week, bringing little more than a few periods of sprinkles. .SHORT TERM /TODAY THROUGH TUESDAY NIGHT/... A high pressure ridge will continue to build offshore throughout the short term, bringing northwest flow aloft and onshore flow at the surface to western Washington. This will bring more spring-like conditions to the region, with temperatures through Tuesday peaking near normal generally in the 60s. In addition, onshore flow will allow marine stratus to expand inland each morning, breaking up for most areas by the afternoon. A splitting frontal system will attempt to overrun the ridge on Tuesday, but will likely bring little more than a few sprinkles to the area. Long Term - Wednesday Through Saturday Wednesday will see more of the same, with potential for a cloudy morning, mostly sunny afternoon, and mild temperatures peaking in the 60s to lower 70s. By Thursday, the upper level ridge offshore will begin to flatten as a low pressure system slowly strengthens and lowers from the Gulf of Alaska. Conditions are favored to remain dry into the first half of the weekend as zonal flow sets up aloft, with continued mild temperatures. Ensembles are honing in on a potential pattern change by the end of next weekend, with increasing chances for accumulating rainfall over the North Cascades on Saturday. However, the details remain uncertain at this time. 15 Marine High pressure will continue to build offshore through much of the next week. This will generate a Small Craft westerly push through the central and eastern Strait of Juan de Fuca tonight, as well as daily pushes of westerly winds through the Strait of Juan de Fuca through much of the coming week. A splitting frontal system will move across the area waters Monday into Tuesday, before high pressure builds back in its wake on Wednesday. Another weak frontal system looks to move into the area waters on Thursday. Seas around 6 to 8 feet today will build to 8 to 10 feet on Monday, remaining near 10 feet through Wednesday. Seas will build to 10 to 13 feet by late Thursday and hover around 10 feet heading into next weekend. 15 Hydrology The daily hydrology discussion has ended until the start of the next rainy season; it will only be updated during this time as needed. NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...Small Craft Advisory from 5pm this afternoon to 5am PDT Monday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca. |
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