"Every year we come here there are always some hot days, but it is the fair right? Summer fair," said Mark Freitas, who came from Union City.
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Many were finding spots of shade to escape the heat. The fair had numerous areas where people could go inside for air conditioning. The water ride was the most popular ride of the day.
"It is finally warmer outside, ditching those cooler temperatures come to the fair and enjoy a ice cream or a cold beer, whatever you are into," said Megan Kreider, the fair spokesperson. "Be sure to stay hydrated, encourage the hats the sunglasses, the sunscreen."
Hot temperatures are expected all weekend. Fair officials expect the heavier crowds to be coming in the evening times.
Friday evening, it got a lot busier.
"We come to the fair every year. It's been a family tradition. My grandmother always brought us when I was growing up," said Oakland resident, Briegette Davis.
Friday was the first day of a heat wave that's supposed to last for several days.
"It's a lot. First heat wave of the summer and it's definitely intense," said Janelle Hibler.
But people say they're not going to let the rising temperatures stop them from having fun.
Many of the fair's water rides were packed with some choosing to go on more than once.
"Probably at least 10," said Francis Jones.
The water rides weren't the only draw to the fair Friday night, though.
After the sunset, there was also a firework and drone show - the biggest one that organizers have ever done.
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"Last year if you came, we did have a drone show, it was 100 drones. This year, we've added another 100," said Megan Kreider.
While the fireworks being out crowds every Fourth of July, a lot of folks say they're just as excited to see the drones.
Not only for the cool technology, but also because they're a safer way to enjoy the holiday.
"The wildfires are a really big risk. So luckily so far this summer we are escaping the smoke from the Canadian wildfires, so hopefully we can keep that trend going," Hibler said.
MORE: Dozens of cooling centers open in South Bay for weekend heatwave
Another fair just its opened for its first day in the North Bay.
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The heat is on in San Rafael, where it was a challenge for some folks to keep cool on the first day of the Marin County Fair.
There was a long line when the gates opened for the kickoff of the Fair, where the food was fried, the rides were cranking and the sun was hot. Very hot. The Moder family from Rohnert Park came prepared.
"We bring an umbrella, we put on sunscreen, caps if we need them. We also brought a portable fan for a breeze in case there wasn't one today," said Xon Moder.
'It's hot!': Heat wave warms 1st day of Marin County Fair
There was no breeze on Friday unless you were riding the 'Scorpion' or cascading down the Super Slide, catching some air.
"If you come to the Marin County Fair, we have lots of places to keep your cool, there are water stations throughout the fairgrounds," said fair spokesperson Laine Hendricks.
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"We're glad this water station is here because it keeps you hydrated, we don't want to buy juice or sugar drinks, this will be a lifesaver today," said Guy Harris from Novato.
"I'm having a refreshing Dole Whip, it's hot. Finally, the heat came right, the fog receded," said Tina Fidler from Richmond.
The Marin County Fair is open through July 4, from 11 a.m. to 11 p.m.