Say this for the recent Bay Area weather pattern: It remains in a state of consistency.

Even the mini heat-up that is forecast to continue into Saturday is again likely to be as fleeting as the weekend itself, according to the National Weather Service.

“Really, just more of the same,” NWS meteorologist Roger Gass said of the brief change. “It’s very similar to what we’ve already experienced.”

Indeed, the region has experienced a couple of small heat-ups previously this month. Like those, this one was expected to put the thermometer into the 90s in the region’s hottest spots, while putting it the upper 80s elsewhere. The heat up began Friday, and in places such as Concord and Livermore with temperatures in the 90s.

Antioch in far east Contra Costa County is expected to reach 97 on Saturday, the high spot in the region. Livermore and Pleasanton are forecast to have highs of 89 on Saturday. Morgan Hill, which was expected to get to 88 on Friday, was forecast for an 87-degree day Saturday.

San Jose is expected to max at 85.

By Sunday, all of those temperatures are expected to be down 4 or 5 degrees in each place. Only in far eastern Contra Costa County are temperatures expected to persist in the 90s through the whole weekend.

“The marine layer is going to compress a little bit, and that’s where the inland areas are going to be able to warm into the lower 90s,” Gass said. “But really, those temperatures are going to be near the average, so it’s really not that warm if you look at it that way. It’s definitely not a heat wave.”

In Santa Cruz, the forecast calls for highs in the mid-70s over the weekend before dipping down to 71 on Monday. In the Santa Cruz Mountains, high temperatures will hit the mid-80s over the weekend before dropping to the low 80s.

The brief heat-up is in keeping with a pattern that has been in place for weeks, according to the weather service. The high pressure that is bringing the clear weather has been able to expand only so much because a low-pressure trough that has formed and held in the upper atmosphere.

That trough has allowed the marine level to expand after its brief stints of compression and brings down temperatures, Gass said. That pattern, which has been in place for most of June according to the weather service, is expected to last at least through the Fourth of July holiday.

“We’ll be back in that pattern with the marine stratus in the mornings and overnight,” Gass said. “Nothing overly hot is on the horizon.”

The Santa Cruz Sentinel contributed to this report.