Barometric Pressure Forecast for Cypress, California
Barometric pressure forecast for Cypress, California — on the flat coastal plain of northwest Orange County, a few miles inland from Long Beach. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Cypress
Cypress occupies the low flat ground of the old San Gabriel River floodplain, close enough to the ocean that the marine layer reaches it most mornings and far enough from the mountains that it escapes the worst of the canyon winds. Southern California gets very few frontal passages, so the pressure story here is mostly about gradients rather than storms. The signature event is the Santa Ana, when high pressure builds over the Great Basin and air drains southwest through the passes, compressing and drying as it descends, which sends humidity into single figures and produces a sharp local pressure and temperature signature within hours. These come mainly between September and February. The counterpart is the late spring and early summer marine layer, the grey mornings of May and June, when the barometer holds steady and the coast stays cool. A handful of winter storms between December and March account for nearly all the rain.
What this means for you
Southern California produces fewer pressure events than most places, but the Santa Ana combines a gradient shift with a dramatic humidity collapse. If you react here, note the humidity alongside the current barometric pressure, because the two arrive together.