It is weirdly warm. If you stepped outside this morning in Southern California expecting that crisp, biting January air, you were probably disappointed—or maybe thrilled. Instead of a heavy coat, you're likely reaching for sunglasses and a light t-shirt.
Basically, it’s about 15 degrees warmer than it should be. While the historical average for mid-January in places like Moreno Valley and the Inland Empire usually hovers around a modest 65°F, today is a completely different story.
High pressure is parked over the West, and it's acting like a lid on a pot, trapping warmth and pushing away the winter storms we saw back on New Year's Day. If you’re checking your phone and seeing numbers in the high 70s or even touching 80°F, you aren't imagining things. This isn't just a "nice day"; it's a significant departure from the norm that has everyone from meteorologists to local gardeners talking.
Breaking Down the Heat: Why Today Feels Different
Climate is what you expect; weather is what you get. Right now, what we’re getting is a robust offshore flow. You've probably heard the term "Santa Ana winds" tossed around on the news. While the winds aren't hitting 60 mph today, that same mechanic is at play.
Dry air is sinking from the high deserts down toward the coast. As it sinks, it compresses. When air compresses, it heats up. It’s simple physics, but the result is a January afternoon that feels more like early May.
The Real Numbers vs. The Averages
Looking at the data from the National Weather Service and historical archives like WeatherSpark, the contrast is stark.
- Today's High: Widespread 78°F to 82°F across the inland valleys.
- Typical January 13: Usually sits at 65°F.
- The Record to Beat: Most local records for this date sit in the mid-80s, set during previous dry spells.
We are flirting with record territory in several zip codes. Honestly, it’s a bit jarring to see the snow-capped peaks of the San Bernardino Mountains while standing in 80-degree heat. That contrast is a hallmark of Southern California, but the intensity of this ridge is pushing the "warm" factor to the limit.
Is This a Heatwave or Just a Fluke?
Technically, a heatwave in winter is defined differently than one in July. We don't need to hit 110°F for it to be considered an extreme event. When the temperature stays 10 to 12 degrees above the mean for several days, it triggers heat advisories for sensitive groups.
According to recent synopses from UCLA’s Atmospheric and Oceanic Sciences, this ridge is expected to hold firm through at least the weekend. That means this isn't a one-day wonder. We're in a pattern.
You’ve probably noticed the air feels incredibly dry, too. Humidity levels have plummeted into the teens. This "fire weather" in the middle of winter is a recurring theme in recent years, though the wet start to the year in early January has fortunately kept the vegetation from being a total tinderbox. Still, the National Weather Service is keeping a close eye on those northeast gusts.
The Health Impact of a "False Spring"
It sounds dramatic, but a sudden jump to 80°F in January can actually mess with your body. We haven't had time to acclimate.
Flu season is still in full swing. Rapid temperature swings—where it’s 40°F at 5:00 AM and 81°F at 2:00 PM—put a lot of stress on the immune system. Doctors often see a spike in "weather headaches" and respiratory issues during these offshore wind events because of the dust and pollen being kicked up.
If you’re out hiking today at Box Springs Mountain or Sycamore Canyon, you’ll need more water than you think. The dry air leeches moisture from your skin and lungs faster than a humid summer day. Basically, don't let the "January" label fool you into skipping the electrolytes.
What This Means for the Rest of Winter
There’s always a worry that a hot January means a dry February.
The "Blobtracker" and marine heatwave monitors are showing that while the ocean is warm, we are currently in a La Niña advisory phase. Typically, La Niña means drier conditions for the southern half of the state. Today’s heat is a classic symptom of that pattern.
However, long-range models are notoriously finicky. While we're basking (or sweltering) today, there are whispers in the meteorological community about a pattern shift toward the end of the month, around January 21st. But for now, the "ridging" is the boss.
Staying Cool When the Calendar Says It's Cold
Since most of us haven't turned on the A/C since October, today might be the day you test the system.
- Hydrate early. Don't wait until you're thirsty; the single-digit humidity is sneaky.
- Protect your plants. If you have new winter seedlings, this heat could fry them. Give them an extra soak this evening.
- Dress in layers. It’s going to drop back into the 40s the second the sun goes down.
- Check on pets. Asphalt can still get hot enough to burn paws when the air is 80°F.
Enjoy the sunshine, but keep the umbrella handy for later this month. This heat is a temporary visitor, even if it feels like it's moved in for good.
Actionable Next Steps:
Check your local HVAC filters today. If this heat persists through the weekend, you don't want to be running your cooling system with a dusty filter that's been sitting idle for months. Also, if you’re planning outdoor activities, aim for before 10:00 AM to avoid the peak UV index, which is surprisingly high during these clear-sky events.