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Jordan Harris, 6, of Vallejo, runs through a stream of water to cool off at the Allan Witt Aquatics Complex in Fairfield on Friday. Temperatures are expected to reach triple digits Saturday and stay above 30 degrees for most of next week. The aquatics complex is open Thursday through Sunday for the summer season and is hosting a free “Family Night at the Pool” from 5 to 8 p.m. on Aug. 6 for National Night Out. (Chris Riley/The Reporter)

Friday was the first full day of summer, and according to the National Weather Service, it promised intense heat that would dry out large parts of the Bay Area.

“The most significant changes will be seen Thursday into Friday,” said NWS meteorologist Dalton Behringer. “Temperatures will average 6 to 10 degrees higher than 24 hours ago. The hottest day, however, will be Saturday.”

As the summer solstice – the official start of summer – arrived at 12:50 p.m. Thursday, a high pressure system formed in the interior of the state – and also statewide. This ridge of high pressure is thick and will cause temperatures to rise across much of the interior, Behringer said.

As a result, temperatures will rise to at least 30 degrees across much of the Bay Area on Friday, with the hottest areas reaching 35 degrees, Behringer said. By Saturday, some inland cities could reach temperatures in the triple digits.

Concord is expected to see highs of 91 degrees on Friday, as is Livermore. Both are expected to reach 99 degrees on Saturday. In the South Bay, Morgan Hill is expected to see highs of 89 degrees on Friday before rising to 97 degrees on Saturday. San Jose is expected to see highs of 83 degrees on Thursday before rising to 91 degrees on Saturday.

“The good news is we’re still calling this an advancing pattern,” Behringer said. “It’s still moving, so it’s going to leave the region pretty quickly and still stay pretty comfortable near the water.”

The marine layer in the Bay Area is expected to disappear for a few days, although winds will remain strong. According to the weather service, temperatures in San Mateo are expected to reach a high of 23 degrees on Friday and 27 degrees on Saturday. In Oakland, highs of 22 degrees are expected on Friday and 25 degrees on Saturday, while in San Francisco, temperatures are not expected to exceed 15 degrees on either day.

The thermometer will drop again on Sunday, said Behringer. On Monday “it will be 8 to 10 degrees cooler than on Saturday, and in the following days a more or less normal temperature pattern will be established.”

Meteorologists urged people to stay hydrated in the heat by drinking every hour, not just when it starts to feel hot. People sensitive to heat were urged to stay in cool areas if possible. Safety officials added that children and animals should never be left in cars; heat-related illness and death can occur within minutes, they said.