Barometric Pressure in South Pasadena, United States 
1009.8 hPa
19.2 ℃
97%
1.22 m/s
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The average pressure in South Pasadena, California, United States today is , which is considered normal. Pressure is trending falling.
Weather prediction: Rain at frequent intervals
Rapid Pressure Changes
Rapid pressure changes detected in South Pasadena, often a sign of approaching weather shifts. See the forecast chart or get pressure alerts.
- Rapid Rise : ()
The daily total fluctuation in pressure in South Pasadena is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in South Pasadena hour by hour across the next 6 hourly readings.
South Pasadena has mild, wet winters and hot, dry summers. Air pressure changes cause different weather patterns. High pressure brings clear skies and calm conditions. Low pressure brings rain and storms.
The city's geography affects air pressure. Surrounding mountains block cold winds from the north. The San Gabriel Mountains also create a rain shadow effect.
Seasonal pressure changes bring different weather. Winter low pressure systems bring rain. Summer high pressure systems bring heat and sunshine.
South Pasadena has a Mediterranean climate. This climate type means high pressure dominates in summer. Low pressure dominates in winter. The climate brings mild, wet winters and hot, dry summers.