Through Wednesday, morning fog and low clouds are expected to give way to hazy afternoon sunshine, forecasters said.
This weather pattern is the result of a marine layer that makes its way inland during the early morning hours, said Kevin Stenson, a meteorologist with WeatherData Inc., which provides forecast information to The Times.
"It's what's known as the 'June gloom,' " Stenson said.
The effect this week will be enhanced by an upper level trough of low pressure, resulting in lower temperatures than the seasonal average in Southern California.
Today's highs are expected to be 82 in Chatsworth and slightly cooler in Woodland Hills, Van Nuys and Burbank.
The ultraviolet level today in the Valley at noon, when the sun's rays are most direct, is expected to be 9, which Stenson said is considered high. A person with a fair complexion would begin to burn after eight minutes of exposure.
Morning lows are expected to range from the low to upper 50s through Friday.
Afternoon highs on Tuesday and Wednesday are expected to be in the mid- to upper 70s, Stenson said.
Beginning Thursday, the trough of low pressure is expected to give way to high pressure, which will result in scattered clouds in the morning and sunny skies and warmer afternoon temperatures, he said.
High temperatures in the Valley are expected to be in the low to mid-80s on Thursday and Friday, he said.