Barometric Pressure in Altadena, United States 
Pressure
1013 hPa
Temperature
15.0 ℃
Humidity
50%
Wind
3.0 m/s
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Forecast
Hourly Pressure Trends
Track the barometric pressure in Altadena hour by hour across the next 6 hourly readings.
Altadena has mild, sunny weather year-round. Air pressure is usually high due to its location near the Pacific Ocean and mountains.
The San Gabriel Mountains to the east make a rain shadow effect, keeping air pressure relatively stable.
In summer, high pressure brings clear skies and warm temperatures. In winter, low-pressure systems bring cooler temperatures and some rain.
Altadena has a Mediterranean climate with low humidity. This climate type means high air pressure dominates, resulting in clear skies and mild temperatures.