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Barometric Pressure Forecast for Diamond Bar, California

Diamond Bar’s barometric pressure forecast covers the hills between the eastern San Gabriel Valley and the western Pomona Valley, near the northern edge of the Chino Hills.

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Pressure and weather in Diamond Bar​

Winter Pacific troughs bring most storm-related pressure shifts, while offshore pressure gradients can drive dry Santa Ana winds in the cooler months. Summer inland heat may persist after marine cloud has cleared from lower coastal areas.

What this means for you​

Hilly routes around Diamond Bar add exertion to any change in weather. Record route length, temperature and current barometric pressure together before treating a headache after a walk as evidence of a pressure trigger.