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Pack the sunscreen and keep water handy as this week will bring the hottest temperatures so far this year, with temperatures expected to hit the low 100s Monday.

The highest temperatures will be felt in traditional hot spots like Concord, Pleasanton, Gilroy and Morgan Hill, with even 105 degrees possible.

On Sunday, San Jose, Oakland, Hayward, and Fremont saw temperatures in the low to mid-90s. Six daily records for June 9 were tied or broken in the Bay Area and Monterey County, including:

San Francisco, 91 degrees (tied record set in 1991)

San Francisco airport, 92 ( broke record of 91 set in 1986)

Oakland airport, 91 (broke record of 86 in 2008)

Half Moon Bay, 86 (broke record of 72 in 1941)

Salinas airport, 98 (broke record of 91 in 1994)

Monterey, 89 (tied record of 89 in 1986)

“We have high pressure building in over the area, and that combined with dry offshore flow is pushing those hotter temperatures toward the coast,” Anna Schneider, a meteorologist with the National Weather Service in Monterey, said Sunday.

Even San Francisco is projected to be in the upper 80s and could hit 90 Monday, she said.

The temperatures are record or near record highs, and a widespread heat advisory is in effect for all of the valleys of the Bay Area, meaning heat exhaustion and heat stroke are possible. The weather service says to drink plenty of fluids, stay in air-conditioned rooms when possible and stay out of the sun.

The hot temperatures will produce widespread moderate to high heat impacts for many locations throughout the San Francisco Bay Area. Learn more about heat risk: https://t.co/GS2NJLywxx. #CAwx #CAheat pic.twitter.com/4x6FXe8PBC — NWS Bay Area (@NWSBayArea) June 10, 2019

Young children and the elderly can be especially vulnerable to the heat. Pets and children should never be left in locked and closed cars, the service said.

Air quality officials issued a Spare the Air alert for Monday, as warmer temperatures and longer days can cause unhealthy air quality due to ozone buildup, meaning “Bay Area residents should consider limiting outdoor activities.”

Santa Clara Valley and the East Bay were forecast as having unhealthy air for sensitive groups Monday, with moderate air quality for the rest of the Bay.

Through Sunday afternoon, the North Bay hills had a red-flag warning in effect, which indicated a higher fire risk due to warm temperatures, very low humidity and strong winds.

Firefighters meanwhile are battling a growing wildfire, called the Sand Fire, in Yolo County, which grew to 2,200 acres late Sunday and was 20 percent contained. Another brush fire broke out Sunday in South San Jose near Morgan Hill.

Steve Anderson, a forecaster for the National Weather Service, said by Monday afternoon most of the smoke from the Sand Fire will have blown out of the Bay Area.

“It’s such a small amount and high in the atmosphere that you can’t really smell it, but it could create a hazy sky,” said Anderson. “But the winds will start changing direction throughout the day [Monday], so it’ll take the smoke far out of the Bay Area tomorrow afternoon.”

Weather service meteorologist Ryan Walbrun said these kinds of streaks of hot temperatures are to be expected this time of the year, when the days are longer and nights don’t provide as much time for the region to cool, but people may not have been as prepared this time around.

“We just had a cooler than normal May, so it might seem more dramatic,” he said of the heat. “A lot of years by this point this really wouldn’t be interesting.”

By Tuesday, coastal areas like San Francisco could cool off dramatically, falling back into the 70s, Schneider said, but East Bay and South Bay cities will still have a warm remainder of the week, with temperatures hovering in the 80s and 90s and a gradual cooling late in the week.