Its a hot one.

San Franciscans sizzled on Monday in 88-degree heat. At SFO, temperatures came in at 93 degrees, almost 30 degrees warmer than the average high temperature for this time of year, said George Cline, a forecaster with the National Weather Service.

Stockton hit 91 degrees Monday; although not a record for the city - that was 103 degrees in 1987 - it is about 10 degrees hotter than the average day in early May.

Livermore also was unseasonably warm, hitting 94 degrees, or almost 20 degrees above normal.

Cline attributed the hike in temperatures to a high pressure ridge that has moved over the state.

In addition, he added, Were not getting any marine air influence at all.

Incoming winds from the Pacific tend to cool down temperatures. Those winds should blow into San Francisco as early as today, sending the temperatures plunging to about 75 degrees and then down to a normal 64 degrees by Wednesday.

Both Stockton and Livermorealso should stay warm through today, starting to cool down to the mid-80s by the middle of the week.

Until that happens, people are trying to find ways to beat the heat.

At Baskin Robbins in Tracy, about twice as many customers as usual came in for a cool treat Monday.

Today is extremely busy, said manager Gayle Leitz.

If were this busy after school, you can count on getting (very) busy tonight, she added.

Leitz said one of her employees accidentally showed up for work on her day off but was asked to stay to take care of the extra customers.

And at West Valley Mall, it was a really strong weekend, with the theaters, the food court and shopping, said Cathy Grebe, the malls marketing manager.

A change in weather usually brings out more shoppers, Grebe added.

They also could have been drawn into the web of Spider-Man 3, which had the biggest opening weekend of any film, generating $151.1 million domestically and $382 million worldwide.