James Island to Point Grenville WA out 10 NM Marine Forecast
| Tonight...N Wind Around 5 Kt. Seas 3 To 4 Ft. Wave Detail: W 4 Ft At 8 Seconds And Sw 2 Ft At 17 Seconds. |
| Mon...N Wind 5 To 10 Kt, Becoming Nw 10 To 15 Kt In The Afternoon. Seas 4 To 6 Ft. Wave Detail: Nw 6 Ft At 10 Seconds And Sw 2 Ft At 15 Seconds. |
| Mon Night...Nw Wind 10 To 15 Kt, Easing To 5 To 10 Kt After Midnight. Seas 5 To 7 Ft. Wave Detail: Nw 6 Ft At 8 Seconds And Sw 2 Ft At 15 Seconds. |
| Tue...Nw Wind 5 To 10 Kt, Backing To Sw In The Afternoon. Seas 4 To 5 Ft. Wave Detail: W 4 Ft At 9 Seconds And Sw 2 Ft At 14 Seconds. A Chance Of Rain In The Afternoon. |
| Tue Night...S Wind 10 To 15 Kt, Rising To 20 To 25 Kt After Midnight. Seas 3 To 4 Ft, Building To 4 To 6 Ft After Midnight. Wave Detail: S 6 Ft At 7 Seconds And W 3 Ft At 9 Seconds. Rain. |
| Wed...S Wind 20 To 25 Kt With Gusts Up To 35 Kt. Seas 6 To 9 Ft, Building To 8 To 11 Ft In The Afternoon. Wave Detail: S 11 Ft At 9 Seconds And W 3 Ft At 9 Seconds. Rain In The Morning, Then Showers In The Afternoon. |
| Wed Night...S Wind 20 To 25 Kt, Becoming Se 15 To 20 Kt After Midnight. Seas 8 To 11 Ft, Subsiding To 6 To 9 Ft After Midnight. Wave Detail: S 10 Ft At 9 Seconds And W 4 Ft At 10 Seconds. Showers In The Evening, Then Rain After Midnight. |
| Thu...Se Wind 10 To 15 Kt, Becoming S 5 To 10 Kt In The Afternoon. Seas 5 To 8 Ft. Wave Detail: S 5 Ft At 8 Seconds And W 5 Ft At 11 Seconds. Rain Likely. |
| Thu Night...Se Wind 5 To 10 Kt, Backing To E After Midnight. Seas 5 To 7 Ft. Wave Detail: S 3 Ft At 7 Seconds And W 5 Ft At 11 Seconds. A Chance Of Rain. |
| Fri...Se Wind Around 5 Kt, Veering To Sw In The Afternoon. Seas 4 To 5 Ft. Wave Detail: S 2 Ft At 7 Seconds, W 4 Ft At 10 Seconds And Sw 2 Ft At 18 Seconds. A Chance Of Rain. |
| Fri Night...Nw Wind Around 5 Kt, Veering To Ne After Midnight. Seas 3 To 4 Ft. Wave Detail: W 4 Ft At 9 Seconds And Sw 2 Ft At 18 Seconds. |
| Area Forecast Discussion National Weather Service Seattle WA 824pm PDT Sunday August 30 2026 Synopsis An upper-ridge looks to remain in place to start the week before a well-organized system arrives on Wednesday and lead into Thursday with the potential for widespread rainfall gusty winds. This disturbance will remain in the vicinity through the weekend keeping conditions cool and unsettled. Short Term - Tonight Through Tuesday Night Latest satellite imagery shows mid to high clouds across Western Washington this evening. Otherwise, conditions are dry and to remain that way as we start the new week. An upper- level ridge is building over the region and remain in place into Monday. For tonight, areas of fog and low clouds are slated to develop. Overnight lows are forecast to bottom out in the mid 40s to mid 50s. As mentioned, dry day on Monday with upper-ridge axis directly overhead in response to an upper-trough digging offshore. Monday may likely be the warmest day of the week as temperatures top out near average. Highs for the interior are to range between the lower 70s to lower 80s. Coastal areas firmly in the 60s. The pattern will begin to turn active on Tuesday as the upper-low associated with the aforementioned upper-trough tacks inland, increasing shower activity across the area. The activity will maintain overnight. Low temperatures are to bottom out in the lower to mid 50s from max temps of 60s and 70s earlier in the day. Long Term - Wednesday Through Sunday Widespread precipitation and gusty winds are favored on Wednesday and Thursday as a well-organized disturbance remains on track to enter the region. NBM 24-hour probabilities of rainfall ending Thursday morning over an 1.00" ranges between 15-30% across the interior while the coast and Olympics have 75-95%. More Quantitative Precipitation Forecast expected to fall throughout the remainder of the day on Thursday. Although there is uncertainty, the upper- trough may maintain over the region through Sunday. Cool and unsettled conditions trending into the weekend as temperatures measure well-below normal. Marine Winds fairly light today as the coastal waters of Washington remain in-between systems. High pressure will briefly nose in on Monday for increasing northwesterly winds. Winds will start to increase once again late Tuesday as a frontal system approaches from the north. The system, which has been delayed slightly in more recent runs, will move through through the middle and latter half of the day with the strongest winds then. The coastal waters (60-80% chc) and the eastern Strait of Juan de Fuca (50-60% chc) will be the most likely places to see gale force gusts, with Small Craft Advisory winds likely elsewhere. Winds will slowly ease Wednesday night into Thursday as the system moves to the south and weakens. Seas remain around 3-6 ft until Wednesday, rising up to around 8-11 ft then as the system moves through. 62 Fire Weather A brief warming and drying trend will occur Monday into Tuesday ahead of the next weather system. Relative humidity minimums in the central and southern Washington Cascades will decrease to around 30 percent tomorrow afternoon. Finer, flashier fuels will be more apt to respond to the dip in RH. More clouds arrive ahead of the stronger system for only partly sunny skies on Tuesday. By late Tuesday night into Wednesday, the stronger system arrives for widespread rain, windy conditions, and slight chances for thunderstorms. 21 NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...None. |
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