Sunshine seekers, consider this your go-ahead to break for the beach -- September's first full weekend is going to be a scorcher, and weather experts say no Bay Area city will be spared from the rising temps.

America's Cup fans in San Francisco will be greeted this weekend with temperatures in the upper-70s, while far-inland areas will reach the upper-90s. Those looking for a place to cool off can find it in coastal areas that aren't likely to rise above 70.

"It's not going to be the hottest weekend of the year, but it will affect a large portion of the region -- most cities across the Bay Area," said Austin Cross, meteorologist for the National Weather Service. "It's not terribly out of the ordinary, but it's been awhile since it's been this hot."

Mary Alexander, of Martinez, rubs the belly of her dog Bailey, a 7-year old Cocker and Tibetan terrier mix, as the two take shelter from the sun under the
Mary Alexander, of Martinez, rubs the belly of her dog Bailey, a 7-year old Cocker and Tibetan terrier mix, as the two take shelter from the sun under the shade of a large tree at Martinez Regional Shoreline in Martinez on, Sept. 6, 2013. Bay Area residents are preparing for a heat wave this weekend. (Jose Carlos Fajardo/Staff)

Cool breezes that normally roll off the ocean won't be as strong, so the region will feel the full impact of heat coming from the land, Cross said.

Air quality could also be an issue, which is typical in hot weather, Cross said. The Bay Area Air Quality Management District on Friday issued a Spare the Air alert, urging residents to avoid driving in anticipation of unhealthy levels of ground-level ozone pollution in the air on Saturday.

While near-100-degree temperatures are common this time of year in far-inland portions of the Bay Area, meteorologists say corners of the region that are usually more temperate are equally susceptible to this weekend's swelter.


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Forecasters don't expect rising temps to break any records, as did a series of hot spells earlier in the season. Temperatures in Brentwood and Concord pushed into triple-digits for days at a time in late June and early July. On June 29, Mountain View broke a 1950 record when it hit 92 degrees, the same day Oakland's 85-degree weather shattered its old record of 81. The next day, Gilroy peaked at 100 to beat its previous record of 98, and on July 4, San Rafael tied its previous record of 98 as Livermore experienced seven straight days of 100-plus temps.

"The heat in that event did not get close enough to the coast to affect the major population areas, but certain areas east of major cities got very hot," said Cross, when only those inland areas truly lived up to the hype of the midsummer heat wave. He recalled a mid-June day in Brentwood, when spectators at a graduation ceremony got heat stroke while standing outside in the crushing heat. This weekend's fiery forecast falls during a time brimming with outdoor activities, including the America's Cup "September Showdown" at 1:15 p.m. Saturday in San Francisco. Further down the Peninsula, revelers at the Mountain View Art & Wine Festival will find themselves facing near-90 degree heat at the all-day festival Saturday and Sunday.

But whether attending an event or relaxing in their own backyard, residents are advised to plan time in the heat accordingly, especially if that time will be spent with children or elderly family members.

Cross stressed the importance of drinking plenty of water, and reminded motorists to never leave kids or pets unattended in the car. And while Cross says it will feel like the dog days of summer in basically any populated area, he suggested one comfortable place for residents to kick back, as long as they don't mind a little sand in their shoes.

"If you want some relief, it's looking relatively mild at the coast," Cross said, noting that while it's expected to hit 86 in Santa Cruz areas, a cool low-70s is in the forecast at Point Reyes, mid-70s in Monterey and upper-60s at Ocean Beach in San Francisco. "It's a great weekend for the beach."

Follow Erin Ivie at Twitter.com/erin_ivie.