Seattle, WA tides 2025

Tide times for Seattle, WA, washington (united states) across 2025. This page covers all twelve calendar months: every high, every low, the spring-neap cycle, and the biggest swings of the year. Spring tides cluster around new and full moons, when the sun and moon line up to amplify the gravitational pull on coastal water — that's when the daily tidal range is biggest at Seattle, WA, both in highs above MLLW and in lows below it. Neap tides land on the quarter moons, when sun and moon work against each other — the daily range compresses, the highs come down, and the lows come up. Within 2025, you'll see this rhythm repeat roughly every two weeks. The biggest swings of the year typically land around the perigean spring tides, when the moon is closest to Earth at the same time it's new or full. Pick a month from the cards below to see the per-day tide table for that calendar month at Seattle, WA. Predictions come from NOAA CO-OPS station 9447130 via harmonic analysis — the gold standard for US tide prediction. Heights are referenced to MLLW (mean lower low water). Heights are relative to MLLW. Not for navigation — for safety-critical use consult official hydrographic services.