You’ve probably stepped outside today and done a double-take at the thermometer. Honestly, it feels more like early May than the middle of January. If you’re looking at the pomona 10 day weather forecast, you’re seeing a strange, beautiful, and slightly confusing mix of "winter" heat and those typical chilly nights that catch you off guard if you leave the house without a hoodie.
Right now, Pomona is sitting pretty under clear nighttime skies. It's about 60°F out there as of Thursday night, January 15, 2026. A light breeze is coming in from the northeast at just 3 mph. It's that classic Inland Empire air—dry, still, and just crisp enough to remind you that the sun isn’t actually up. But man, that sun was working hard today.
The Immediate Outlook: Sun, More Sun, and the 80-Degree Threat
If you’re planning your weekend, you’ve basically hit the jackpot. Thursday hit a high of 79°F. Tomorrow, Friday, January 16, is looking like a near-repeat with a high of 77°F. It’s sunny, it’s dry, and the UV index is sitting at a 3. You won’t exactly fry, but if you’re out at the Fairplex or walking around Western University, you’ll definitely feel the bite of the sun on your shoulders.
Here is the thing about Pomona in January: the "whiplash" is real.
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We’re seeing daytime highs in the high 70s, but the lows are dipping down to 53°F or 54°F. That’s a 25-degree swing. You start the day in a t-shirt and end it wondering why you didn't bring a heavier coat. Saturday keeps that energy going with a high of 78°F. Basically, it’s shorts weather for the foreseeable future.
Looking Ahead: The Slow Fade into "Normal"
By the time we hit Sunday and Monday (January 18-19), the mercury starts to retreat, but only slightly. We’re looking at 75°F for both days. Still mostly sunny. Still very dry—humidity is hovering around 31-32%. It’s actually great for anyone who hates that sticky coastal dampness, but keep an eye on your plants. This kind of dry heat in the middle of winter can zap the moisture right out of your garden.
- Sunday, Jan 18: High 75°F / Low 53°F (Mostly sunny)
- Monday, Jan 19: High 75°F / Low 52°F (Mostly sunny)
- Tuesday, Jan 20: High 75°F / Low 51°F (Mostly cloudy)
Notice that shift on Tuesday? The clouds finally start to roll in. After nearly a week of wall-to-wall blue skies, Tuesday and Wednesday (January 21) bring some "mostly cloudy" conditions. The temperature finally breaks out of the 70s on Wednesday, dropping to a much more seasonable 70°F.
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Is Rain Actually Coming?
Kinda. But don't go buying a new umbrella just yet.
The pomona 10 day weather forecast shows a persistent 10% chance of rain starting Friday night and popping up again throughout next week. In SoCal-speak, a 10% chance basically means "it might look moody for twenty minutes, but your car probably won't even get wet."
The real change happens toward the end of next week. By Thursday, January 22, the high drops to 68°F. That’s a massive difference from the 79°F we’re seeing today. Friday and Saturday (Jan 23-24) stay in that 67-68°F range. It’ll feel significantly colder, mostly because we’ve been spoiled by this weird January heatwave.
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Why It Matters for Your Health
It’s easy to ignore a weather report when it just says "sunny," but there are a few things to watch out for in Pomona right now.
First, the pollen. Local alerts are showing medium-high levels of Ash and Alder pollen. If your eyes are itchy and you’re sneezing, it’s not a "winter cold"—it’s the trees reacting to the warmth. Second, the air quality. When we get these stagnant, sunny days with almost no wind (we’re talking 3-5 mph), the Inland Empire can trap pollutants. If you have asthma, maybe save the heavy outdoor cardio for the early morning.
What to Actually Do This Week
Honestly, take advantage of the 70s while they’re here. By the end of the 10-day window, we’re sliding back into the 60s, which is much closer to Pomona's historical average of 66°F for January.
- Hydrate your landscape: With humidity dropping as low as 28% on Saturday, your yard is thirsty.
- Layering is your best friend: Don't let the 77°F Friday afternoon fool you; it’ll be 54°F by the time you're heading home from dinner.
- Check your tires: Big temperature swings can mess with your tire pressure. If that little light pops up on your dashboard on a cold morning, that's why.
The pomona 10 day weather forecast is giving us one last blast of summer before the "real" winter settles back in. Enjoy the sun, keep the allergy meds handy, and maybe wait until next Thursday to break out the heavy sweaters again.