Barometric Pressure Forecast for Arcadia, California
Barometric pressure forecast for Arcadia, California — on the alluvial fans at the foot of the San Gabriel Mountains. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Arcadia
Arcadia sits on the sloping alluvial fans at the base of the San Gabriel Mountains, in the San Gabriel Valley about fifteen miles northeast of downtown Los Angeles, with peaks rising to nearly six thousand feet directly behind the town. That mountain wall is the defining feature of its weather. Under a Santa Ana pattern the air descends those slopes, compressing and heating as it falls, and the foothill communities along this stretch see the strongest gusts and the lowest humidity in the basin — single-digit readings are routine in October and November. The rest of the year is remarkably quiet on the barometer. Winter brings a handful of Pacific frontal systems, occasionally reinforced by an atmospheric river aimed at southern California, and those are the only substantial pressure falls Arcadia records. Summer runs on the marine layer, thick low cloud overnight and in the morning, burning off by midday, with the pressure trace barely moving for months.
What this means for you
Because the barometer is so quiet here for most of the year, the Santa Ana events and the winter fronts stand out sharply against the background. That contrast makes the barometric pressure forecast unusually easy to interpret in the San Gabriel foothills.