Cool nights, warm days and clear skies are in the forcast for the weekend, providing perfect conditions for the Blue Angels scheduled to fly over San Francisco Friday, Saturday and Sunday during Fleet Week

High dry weather right into the weekend, temperatures recovering nicely each day into the upper 60s and 70s around SF And bay waters.  "Sunny days, clear nights...It could be a little partly cloudy late Saturday night into Sunday morning, but besides that it's all clear," says Rick Canepa, a meteorologist with the National Weather Service Bay Area.

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Many Bay Area residents felt a chill when they woke Friday morning, and the cold nights are expected to continue through the weekend. But the days will be warm and sunny.

Overnight temperatures in inland valleys dropped into the 30s overnight. Sonoma County Airport saw a low of 34 degrees. Locations near the ocean didn't see the dramatic drop and remained in the 50s overnight. Downtown San Francisco saw a low of 56 degrees.

"We have really dry air in place because we had all that offshore flow," explains Spencer Tangen, a forecaster with the National Weather Service's Monterey office. "When we get dry air, the temperatures cools off at night, especially in the valley locations where there’s no influence from the ocean."

Tangen adds that the clear skies are also contributing to the chill. "It allows heat from the ground to radiate into space," he says. "All the cold that forms overnight in the hills and valleys, it’s dense and so it sinks down to the bottom of the valleys. That’s why you get the cold lows concentrated in the valleys on nights last night."

While the North and East Bay valleys dipped into the 30s overnight, temperatures in the hills were in the 50s. Mount St. Helena saw a low of 51 degrees.

The cool overnight temperatures are expected to continue through the weekend and Friday night will be equally cool or even colder.

But don't let the cold fool you. Afternoon temperatures are forecast to be warm and, on Friday especially, the mercury is set to make a dramatic rise through the day.

"Friday will be a little bit warmer than Thursday by a degree or two," says Tangen. "Downtown San Francisco will be in the mid-70s and  along the bay shoreline, we'll see mid- to upper-70s. A few spots could hit 80 like Redwood city. San Jose forecast is to be 82. North and East Bay valleys will be in the low- to mid-80s."

Afternoon highs will be lower on Saturday by a couple degrees as a weak system from the Northwest moves into Northern California. While the storm will deliver some rain to Oregon and Washington and possibly the far reaches of Northern California, it's not expected to bring precipitation to the Bay Area.

The cooling trend continues on Sunday and the forecast calls for 70s on the coast and bay shoreline and upper-70s to low-80s in inland valleys.

Amy Graff is a digital editor at SFGATE. Email her weather tips and photos at [email protected]