Sounds great to me. How far does that extend inland?
Ha, it doesn't. That marine layer is limited to a few square miles of microclimate specific to San Francisco and the immediate coast.
The rest of the Bay Area has entirely different patterns, and you really can't grasp the complexity until you’ve spent time here. You can find massive variations in weather within just a half-mile radius, heavily influenced by hills, mountains, and proximity to the water.
To give you an idea of the extremes, there’s often a 50°F temperature differential between downtown San Francisco and suburban Walnut Creek (Mt Diablo hike)—a distance of only 20 miles with almost no change in elevation.
In the city, there are neighborhoods (Sunset, Richmond) where you might not see the sun for weeks in the summer (red X). However, neighborhoods (Noe Valley, Potrero Hill, Bernal Heights, etc) on the lee side of peaks like Twin Peaks, Sutro, and Davidson are semi-protected, often seeing two to four times as much sun while remaining an easy commute to Silicon Valley or SFO (green square).
Ironically, in the Bay Area, waterfront real estate isn't the most desirable—people usually prefer the hills. The coastline/SF Bay is often plagued by fog, the cold Pacific, brackish water, and wetlands, and much of the waterfront in SF is built on landfill, which is a major seismic concern.
To the foothills of the Sierra?
The foothills of the Sierra are mostly suburban sprawl for 40 miles from Sacramento to Auburn (I-80) or Placerville (50). To me, the foothills, while geographically well-located and forested, are not all that desirable. They are exurbs with great hiking and parks, but probably cost $100s in gas plus traffic to go anywhere: job, forest, shopping, etc.
This is the real reason why the drive to Tahoe almost always sucks. Sure, weather can impact the climbs/passes (as expected), but every single day of the week one needs to deal with the Sacramento Metro rush hour. Also, Tahoe's roads cannot really handle Saturday or major holiday traffic.
Yes, vacationers will say, "I visited for a week in February, and everything was great - no lines or crowds!" Yes, this is always true. Tahoe = Vermont crowd flows. No one is there midweek. And Reno Airport is a breeze. Go!
LA to Mammoth is likely an easier commute because one never hits traffic/gridlock once outside of LA, crosses 7,000-ft passes, or has minimum chain control.
SF Bay Area (9M people) is mostly forced to drive through Sacramento metro (2.5M). Imagine if one had to commute to Colorado front-range resorts: Denver (3.8M) and then drive through SLC (1.3M) to get to a crowded Breckenridge? That's Tahoe (Palisades, Northstar, Heavenly)
Note: Look at Tseeb's departure/arrival schedule for Tahoe. 3-5 AM is a common wake-up and/or departure time. And it's realistic/necessity. Alternatively, one can leave at 8/9 PM on Fridays to arrive at 12/1 AM to avoid traffic.