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Altadena, California, United States has a Mediterranean climate with hot, dry summers and mild, wet winters.
In the summer months, June through August, the average high temperature is in the mid 80s to the low 90s Fahrenheit (29-33 degrees Celsius). The temperature rarely exceeds 100°F (38°C). The average low temperature during the summer is in the mid 50s to the mid 60s Fahrenheit (13-18°C).
In the winter months, December through February, the average high temperature is in the low to mid 60s Fahrenheit (17-18°C). The average low temperature during the winter is in the low 40s Fahrenheit (4-6°C). The temperature rarely drops below freezing.
The spring months, March through May, and fall months, September through November, have mild temperatures with average highs ranging from the mid 60s to the mid 70s Fahrenheit (17-23°C). The average lows during these months are in the low 40s to the low 50s Fahrenheit (4-11°C).
Altadena, California receives an average of 13 inches of rain per year. Most of the rain falls in the winter months, while the summer months are mostly dry.
As of 2020, the city population is 43037.
This map shows the current & 7-day weather forecast, weather alerts, and weather radar for Altadena, California.