SAN FRANCISCO (BCN/CBS SF) — Temperatures soared this Memorial Day afternoon with a number of North and East Bay counties under a heat advisory while a Spare the Air alert was in effect for the entire Bay Area.

The National Weather Service forecast for the San Francisco Bay Area is for sunny skies and temperatures well above normal Monday with highs in the 70s along the coast, in the 80s and 90s around the bay, and up to 103 in north bay and interior valleys.

READ MORE: Crews Battling Fast-Moving 3-Alarm Fire In Vallejo, Evacuations Underway

The advisory impacts a majority of Marin, Sonoma and Napa counties as well as parts of Contra Costa, Alameda and Santa Clara counties. Additionally, Solano County will be under a more extreme excessive heat watch that will cover more counties to the east of the immediate Bay Area.

The National Weather Service Bay Area office advised residents to practice heat safety once the advisory went into effect at noon.

The air alert announced on Sunday, the first this year, anticipates elevated concentrations of smog as traffic returns to pre-pandemic levels, said Jack Broadbent, executive officer of the Bay Area Air Quality Management District.

“This alert highlights the need to reduce our driving and keep air quality healthy by finding alternatives to driving alone such as taking transit or walking or biking,” Broadbent said.

The air alerts are issued when ozone pollution is forecast to reach unhealthy levels. Ozone, or smog, can cause throat irritation, congestion, chest pain, trigger asthma, inflame the lining of the lungs and worsen bronchitis and emphysema, air officials said.

The understatement of the day goes to John Azinheira in Concord.

“It’s a little hot out there,” he told KPIX5.

John and his dog Posey were playing in the shade, chasing squirrels and staying on the grass as temperatures soared to the triple digits – taking extra care during walks.

“Especially, the black top. We’ll touch it first. If it hurts us, it’ll hurt her so we won’t put her down.”

READ MORE: Man Accused Of Stealing Lemur From SF Zoo Charged With Violating Endangered Species Act

Across the park, charcoal briquets were flaming, while there wasn’t enough of a breeze to fly a kite with any measure of success.

A church group however, couldn’t be dissuaded from a game of volleyball. “It’s good to get a little tan on. It’s good to get a little sweat, burn the calories,” said Soni Vilingia.

Cooling centers were open all over Contra Costa County, as folks hit the pool, by reservation only to beat the heat.

“You have to – 5 o’clock on Wednesdays, we’re at the computer, trying to get time for the following week and whatnot,” said swimmer Paige McDaniel.

While it’s not a thermometer, you can often gauge the heat index by the line for ice cream in Walnut Creek. On Monday, it stretched down the block at Lottie’s Creamery.

“I’ll be getting their mint chip in a cone because it’s super good here. It’s very refreshing for a hot day,” said Maya Kramer.

More information is available at sparetheair.org.

Temperatures are forecast to rise much higher further inland, particularly in the areas of Yuba City, Grass Valley, Clear Lake and Chico.

The Bay Area heat advisory is in effect until 9 p.m. Monday for the north bay and east bay regions of the Bay Area. Overnight lows are expected to be in the mid 50s.

Blasts of extreme heat generally puts strains on the state power grid. Officials said that would not be the case on Memorial Day.

There’s enough electricity to serve the expected spike in demand, California Independent System Operator said in a statement Saturday, but it will monitor the grid closely in case it needs to call on the public to conserve.

ISO has said the state is better prepared to avoid last summer’s rotating blackouts. However, they cautioned the power grid of the nation’s most populous state is still vulnerable to extreme heat waves that could force more outages.

The heat gradually eases Tuesday and temperatures return to near normal by Wednesday through the end of the week.

MORE NEWS: UPDATE: Fire Destroys 2 Pleasant Hill Homes; Resident Still Missing, Firefighter Suffers Burns

KPIX 5’s Andria Borba contributed to this report.