Barometric Pressure Forecast for Pleasant Hill, California
Barometric pressure forecast for Pleasant Hill, California — in central Contra Costa County below Mount Diablo, between the Delta and the Bay. See current barometric pressure and what it means for weather-sensitive people.
Download Pressure Pal to track barometric pressure and get migraine alerts for Pleasant Hill and your area.
Pressure and weather in Pleasant Hill
Pleasant Hill sits in the Diablo valley, sheltered from the Pacific by the East Bay hills and overlooked by Mount Diablo to the southeast, which makes it noticeably hotter in summer and colder on winter nights than San Francisco half an hour away. The dominant summer rhythm is the marine layer. When the Central Valley heats up, the pressure difference across the Coast Ranges pulls cool ocean air through the Golden Gate and the Carquinez Strait, and that flow reaches Contra Costa in the evening, dropping temperatures sharply and often arriving as a distinct gusty push rather than a gradual cooling. Winter is the season of Pacific storms, and the biggest come as atmospheric rivers, long plumes of subtropical moisture that bring a substantial fall in current barometric pressure, days of rain and strong south wind. Autumn brings the dangerous pattern, the Diablo wind, when high pressure over the Great Basin forces dry offshore flow down the slopes of the coast ranges, heating and drying as it descends and driving the region's worst fire weather. Between storms, winter high pressure can leave the barometer high and static under tule fog drifting in from the Delta. A barometric pressure forecast for Pleasant Hill matters most from November through March.
What this means for you
Can barometric pressure cause headaches? Diablo wind events pair rising pressure with collapsing humidity, while atmospheric rivers pair falling pressure with saturated air, so the two isolate the variables neatly. Use Pressure Pal as a migraine tracker app and see which of the two patterns shows up in your log.