HEAT: Coastal areas are expected to reach temperatures in the 80s.

Southern California is warming up in the first significant heat wave of the season following an early summer marked by June Gloom that carried on into July.

The National Weather Service issued a heat advisory for a long swath of the region Friday morning and will keep it in effect until Sunday night.

High temperatures are expected to reach from the mid-90s into the 100-degree in many valley and mountain areas.

The desert areas southeast of Los Angeles are under an excessive-heat warning.

“Onshore gradients will trend weaker through Saturday resulting in what should be the warmest day in most areas with highs topping 100 in some of the warmer valley areas and above 105 in the far inland locations,” said the NWS forecast. “Beaches will continue to feel the effects of the marine layer which should remain around 1000` deep. Some dense fog is likely there as well, especially in the late night and early morning hours.”

While temperatures will be high, they are not expected to break any records.

“By Sunday increasing onshore flow will bring a couple degrees of relief to most areas but highs will still be 4-8 degrees above normal. Similar trends Monday, except an increase in northerly flow Monday afternoon and evening will likely generate some gusty winds through and below the Santa Ynez Range and parts of the LA/Ventura mtns/valleys,” said the forecast.

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