San Fernando Valley Weather

San Fernando Valley Weather


The San Fernando Valley experiences a greater variance in temperature than it’s neighbor, Los Angeles, as a result of its separation from the moderating effects of the coastal weather patterns by mountain ranges. The Valley experiences more desert-like conditions, with warmer temperatures in the summer and colder ones in the winter. Summer comes late to the area and the hottest months are often September and October, with temperatures often soaring well into the triple digits throughout the valley. Winter lows can dip into the low forties and sometimes even colder in the North Valley areas.

The overall climate of the San Fernando Valley is also that of a desert region, with consistently dry, low humidity conditions. Rainfall is minimal, but there is a rainy season and January and February often see extensive rainstorms that can last for days on end, usually resulting in significant flooding the area. Electrical storms with thunder and lightning are rare. Rainfall typically isn’t more than 3-4 inches at the rainiest point of the season and in the summer, drought conditions are often a problem. The extreme heat and water shortages in the summer months often require Valley residents to be on watering restrictions and rolling “brown outs” to conserve energy. Late spring and early summer (April, May, June) are some of the best months for optimal climate conditions. The weather is still cool and the recent rains ensure that everything is blooming.

Though the smog conditions are the best they’ve been in twenty years, there’s still an ever-present haze that hangs over the San Fernando Valley. The effect is somewhat a result of the fact that the Valley is a basin so the air gets trapped and the area has suffered from haze since before industrialization. The clearest days are after a rainstorm or when the Santa Ana winds help to blow some of the smog out of the basin.





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Partly Cloudy