If you’re waking up in San Bernardino today, Saturday, January 17, 2026, you’re likely feeling that weird "fake spring" vibe that Southern California does so well. Honestly, it’s 56°F right now as I write this on a Saturday night, and while that sounds chilly to the rest of the country, for us, it's just prime hoodie weather. But don't let the night air fool you.
The 7 day forecast san bernardino ca is actually looking way warmer than the typical January average of 63°F. We are currently sitting in a pattern that feels more like April than mid-winter.
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The Heat is Staying Put (For Now)
Basically, we just came off a high of 81°F today. That is a solid 18 degrees above what we usually expect this time of year. If you were planning on breaking out the heavy coats for a stroll through Seccombe Lake Park, maybe stick to a light t-shirt instead.
Tomorrow, Sunday, January 18, is going to be almost a carbon copy of today. We’re looking at 80°F for the high and 46°F for the low. It’s that classic Inland Empire "desert swing"—you’ll be sweating at 2:00 PM and reaching for a blanket by 8:00 PM.
The sun is going to be out, mostly. The humidity is super low, around 20%, which is typical when those north winds start blowing through the Cajon Pass. Speaking of wind, it’s coming from the north at about 6 mph. Nothing crazy, but enough to keep the air moving.
The Week Ahead: A Slow Slide
Monday and Tuesday (January 19-20) are keeping the streak alive.
Expect:
- Monday: Sunny, high of 79°F, low of 46°F.
- Tuesday: Sunny, high of 78°F, low of 45°F.
It’s a great window if you’ve been meaning to get some yard work done or hit the trails before the "real" winter weather decides to show up.
Is Rain Actually Coming?
Here is where it gets interesting. Most people see "partly sunny" in the 7 day forecast san bernardino ca and assume it’s just clear skies forever. But by Wednesday, January 21, the clouds start to thicken up.
We’re still looking at a high of 78°F on Wednesday, but the night is going to be "mostly cloudy." By Thursday, the temperature finally starts to take a dip, dropping to a high of 74°F.
Friday, January 23, is the real turning point. We’re looking at a high of 70°F—which, funny enough, is still warmer than the "normal" average, but it’ll feel cold compared to the 80s we’ve been having. There’s a tiny 5% to 10% chance of rain mentioned in the data, but honestly, don’t cancel your outdoor plans just yet. It’s more about the humidity creeping back up to 35% and the winds shifting to the northwest.
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Why This Matters for Your Health
It’s not just about what clothes to wear. San Bernardino County health officials have actually been talking about a surge in respiratory illnesses lately—pertussis cases have almost tripled recently. When the weather swings from 81°F during the day to 43°F at night (which is the low for next Thursday), it puts a lot of stress on the immune system.
Kinda makes sense why everyone seems to have a "permanent" January cold, right?
Real-World Tips for the Next 7 Days
- Hydrate like it's July. With humidity dropping as low as 20% early in the week, you’re going to get dry skin and scratchy throats.
- Dust is a thing. Those north winds (even at 6-7 mph) can kick up a lot of particulate matter in the IE. If you have asthma, Wednesday might be a better day to stay indoors when the wind dies down to 5 mph.
- The "Volunteer" Factor. If you’re planning to help with the San Bernardino County Point-in-Time count on January 22, dress in layers. You’ll be starting in 43°F weather and ending in 74°F sun.
The big takeaway? Enjoy the warmth while it lasts, but don't get too comfortable. The ridge of high pressure keeping us toasty is eventually going to give way, and while we aren't seeing a massive storm in the immediate 7-day window, the "cooling trend" starting next Friday is the first sign of a shift.
Keep your eye on those overnight lows—43°F is no joke if you're out late.
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Next Steps:
- Check your irrigation timers; with 80-degree weather and 20% humidity, your plants are thirstier than usual for January.
- If you're heading toward the mountains, remember that the "highs" there are much lower, despite the valley sun.
- Prep your car’s AC now—you’re going to need it Monday afternoon.