Barometric Pressure Forecast for Anacortes, Washington
Barometric pressure forecast for Anacortes, Washington — on Fidalgo Island in the Salish Sea, inside the Olympic rain shadow. Check current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Anacortes
Anacortes occupies Fidalgo Island at the northern end of Puget Sound, where the Salish Sea opens toward the San Juans. Two pieces of geography control the weather. The first is the Olympic rain shadow: Pacific fronts arriving from the south-west are wrung out over the Olympic Mountains, and the sinking air on the lee side leaves Anacortes with roughly half the rainfall of Seattle and far less than the coast an hour west. Fronts still pass over — the pressure falls and rises arrive on schedule from October through March as one system after another crosses the North Pacific — but they often deliver a modest drizzle rather than the downpour the barometer would suggest. The second is the Fraser River valley to the north-east. When cold continental air pools over interior British Columbia and a low moves offshore, that air drains through the Fraser gap and accelerates south across the San Juans, producing the sharp north-easterly outflow events that bring the area's coldest temperatures and occasional snow. Summer is dry and settled under the eastern Pacific high, with pressure barely moving for weeks.
What this means for you
The rain shadow means Anacortes can show a substantial barometric pressure fall on a day that looks almost unremarkable out the window — a useful reminder that what your body responds to is the pressure change, not the rain. A barometric pressure forecast is at its most valuable here from late autumn through early spring, when frontal systems arrive in quick succession.