Barometric Pressure in San Francisco, United States 
1009.7 hPa
15.7 ℃
94%
2.1 m/s
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The average pressure in San Francisco, California, United States today is , which is lower than normal. Pressure is trending falling.
Weather prediction: Rain at frequent intervals
The daily total fluctuation in pressure in San Francisco is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in San Francisco hour by hour across the next 6 hourly readings.
San Francisco's barometric pressure is typically between 30.0 and 30.3 inches. This is slightly higher than the national average. The pressure remains relatively steady throughout the year.
San Francisco is surrounded by water on three sides. The Pacific Ocean lies to the west. The San Francisco Bay is to the east. The Golden Gate Strait connects the two.
This unique landscape affects the city's atmospheric pressure. The ocean's influence keeps the pressure stable. The bay and strait create a corridor for winds to pass through. This reduces extreme pressure changes.
The surrounding hills and mountains also impact the pressure. They block or redirect winds, moderating the city's weather. As a result, San Francisco's barometric pressure remains relatively consistent.