Honestly, if you're looking at a 15 day weather forecast san francisco ca, you’ve probably already realized that this city doesn't play by the rules. While the rest of the country is dealing with "actual" winter, we're out here in mid-January 2026 experiencing something that feels suspiciously like a lukewarm spring.
Right now, as of Thursday, January 15, 2026, the city is sitting at a crisp 59°F under clear night skies. It’s the kind of night where the northeast wind is barely a whisper at 4 mph, and the air feels just damp enough (67% humidity) to remind you that the Pacific is right there, lurking in the dark.
But here is the thing about a two-week outlook in SF. You can't just look at one number and call it a day.
The Mid-January Reality Check
If you're planning your life around the next two weeks, the data looks pretty stable on the surface. Today we hit a high of 64°F, and tomorrow, Friday, January 16, is looking like a near-repeat with a high of 63°F and plenty of sun.
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It’s almost boring. Almost.
But then Saturday hits. On January 17, the clouds start moving in. We’re still looking at a high of 63°F, but the sky turns "mostly cloudy," and we get our first real hint of moisture with a 10% chance of rain. It isn't much. It’s basically just a vibe shift.
By the time we get into next week—specifically around Tuesday, January 20 through Thursday, January 22—the temperature starts a slow, agonizing crawl downward. We’re talking highs dropping from 59°F to 56°F. It doesn't sound like a lot, but in San Francisco, five degrees is the difference between "I can wear a t-shirt in the Mission" and "I need a down parka at Ocean Beach."
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Why 15 Days is a Long Time in SF
Forecast models right now are showing a split jet stream. Basically, California is locked into a stable pattern for the moment, which is why we're seeing these consistent 50-to-60-degree days. But there’s a La Niña paradox happening this year. We’ve had heavy rain in spots, but the snowpack in the Sierras is being stubborn.
For the city, this means we’re stuck in a "grey-gold" cycle.
- Jan 18-19: Partly sunny, highs around 63°F to 61°F.
- Jan 21-22: Humidity spikes to 75-76%, and that 20% rain chance on Thursday night starts looking a lot more real.
- Jan 23: A little more sun, but the wind shifts to the west at 6 mph, bringing that biting ocean air back into the fold.
The Neighborhood Tax
You can’t talk about a 15 day weather forecast san francisco ca without acknowledging that "San Francisco" isn't a single weather zone. It’s a collection of warring atmospheric fiefdoms.
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If you live in the Sunset or Richmond, you’re living in the "Fog Belt." While the official sensor might say 63°F, you’re likely feeling 55°F with a side of mist. Meanwhile, over in the Mission or Noe Valley, it’s "The Sun Belt." You’re probably sitting on a patio right now wondering why everyone else is complaining.
This microclimate madness is why your 15-day forecast often feels like a lie. The "official" temp is usually recorded near the water or at the airport (SFO), which has its own weird ecosystem.
What to Actually Expect (Prose version)
Looking ahead to the end of the month, specifically January 24 and 25, things stay in that "mostly cloudy" pocket. Highs will hover around 56°F or 57°F, with lows consistently hitting 49°F. It’s the "San Francisco Uniform" weather: jeans, a light sweater, and a windbreaker you’ll take off and put back on seventeen times before lunch.
Actionable Tips for the Next Two Weeks
Forget the umbrella for now—you probably won't need it for more than a drizzle. Instead, focus on the wind. The shifts from northeast to west later in the week mean the "perceived" temperature is going to tank even if the mercury stays the same.
- Layer for the 10-degree swing: If you’re moving from the Embarcadero to Twin Peaks, expect the temperature to drop 1 degree for every 100 feet of elevation or every mile toward the ocean.
- Watch the Thursday (Jan 22) transition: This is when the wind direction flips to the southwest. This usually brings in more moisture and that "heavy" air feeling.
- Check the dew point: With humidity hitting 76% late next week, your hair is going to do things you didn't authorize. Plan accordingly.
The bottom line? San Francisco in mid-January 2026 is behaving itself—for now. We're dodging the major storms that usually define this month, but the "chilly" shift starting January 20 means you should keep the heavy blankets on the bed.