Honestly, people think California weather is just a perpetual loop of sunshine and 75-degree days. If you’ve lived in the South Bay for any amount of time, you know that's kinda a myth—especially in January.
Right now, looking at the 10 day forecast San Jose CA, we’re seeing a classic mid-winter stretch that’s actually pretty decent if you hate the rain. But it’s not exactly beach weather either.
Today, Sunday, January 18, 2026, it’s a comfortable 61°F outside. It’s partly sunny, the kind of day where you’re constantly taking your hoodie on and off because the sun hits you and you're warm, then a breeze kicks in and you're shivering. Speaking of breeze, the wind is barely moving at 1 mph from the northwest. It’s quiet.
The Next Week in the Valley
If you’re planning your week, Monday is looking like the winner. We’re hitting a high of 67°F with mostly sunny skies. It’s basically the best version of a San Jose winter day.
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But don't get too used to the brightness. By Tuesday and Wednesday, things start to grey out. We’re looking at mostly cloudy to full-on cloudy conditions. Temperatures will dip slightly into the mid-60s, specifically around 64°F on Tuesday and 63°F on Wednesday. Humidity is going to hover in that 60% to 68% range, so it might feel a bit damp even if it’s not pouring.
Rain Chances and Nightly Chills
Is it going to rain? Probably not much.
The chance of precipitation stays low—mostly between 5% and 15% throughout the week. Saturday, January 24, has the "highest" chance at a measly 15%. In San Jose, we call that "maybe a windshield wiper day."
One thing you’ve gotta prep for is the temperature drop once the sun goes down. We’re looking at consistent lows of 44°F to 47°F.
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- Sunday Night: 44°F
- Monday Night: 44°F
- Wednesday Night: 47°F (The "warmest" night, if you can call it that)
- Next Weekend: Back down to 45°F
Why San Jose Weather is Weirdly Specific
Most people get the "rain shadow" effect wrong. They think because San Francisco is getting hammered with rain, San Jose will too. Nope.
Because we’re tucked behind the Santa Cruz Mountains, the clouds often dump their water on the coastal side and the mountains before they even reach us. That’s why our 10 day forecast San Jose CA often looks a lot drier than our neighbors to the north. We’re basically in a giant bowl that stays a few degrees warmer and a lot drier than the rest of the Bay Area.
Looking Toward Late January
By the time we hit the end of this 10-day stretch, around Tuesday, January 27, we’re back to those 67°F highs. It’s remarkably consistent. The UV index stays low at a 2, so you don't need to go heavy on the sunscreen, but it’s still bright enough to be annoying while driving down 101.
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The wind stays calm too. Aside from a small jump to 6 mph on Saturday, most days are seeing winds at 2 or 3 mph. It’s stagnant, which is great for outdoor dining but not so great for clearing out the valley haze.
If you're heading out this week, honestly, just layer up. The jump from a 66°F afternoon to a 44°F evening happens fast. Keep a light jacket in the car; you'll definitely need it by 5:00 PM.
To make the most of this forecast, schedule your outdoor runs or park visits for Monday or the following Tuesday when the sun is actually making an appearance. If you have errands that require dry ground—like car washes or window cleaning—this entire 10-day window is actually looking pretty safe despite the "cloudy" labels on mid-week.