Say this for the recent Bay Area weather pattern: It remains consistent.

Even the small heat-up that is forecast to continue into today 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, following similar patterns: putting the thermometer into the 90s in the region’s hottest spots, while reaching the upper 80s elsewhere.

In places such as Concord and Livermore, the latest heat-up was expected to be a degree or two higher Friday, reaching the low 90s, than today’s high temperature as forecast.

Antioch, in far east Contra Costa County, is expected to reach 97 today, making it the high spot in the region. Livermore and Pleasanton are forecast to have highs of 89 today. Morgan Hill, which was expected to get to 88 on Friday, was forecast for an 87-degree day today. San Jose is expected to top out at 85.

By Sunday, all of those temperatures are expected to be down 4 or 5 degrees in each locale. 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.”

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.”