Honestly, if you've lived in the Inland Empire for more than a week, you know the sky here has a mind of its own. One day you're wearing a light sweater, and the next you’re wondering why you even own a heavy jacket in Southern California. Right now, looking at the Moreno Valley weather forecast 10 day outlook, things are actually looking pretty decent for late January, but there’s a definite shift coming that’ll catch you off guard if you aren't paying attention.
The high-pressure ridge that’s been keeping us unusually warm is starting to wiggle.
The Immediate Window: Sun and Santa Anas
Today, Sunday, January 18, we’re sitting at a very comfortable high of 75°F. It’s basically peak "winter in SoCal" vibes. The sky is clear, the UV index is low (around 2), and the wind is just a gentle northeast nudge at 5 mph. Tomorrow, Monday, January 19, actually kicks it up a notch to 76°F. If you have outdoor plans or need to wash the car, do it now.
By Tuesday, we stay in the mid-70s, specifically 74°F, but the nighttime lows are starting to feel a bit more like actual winter, dipping down to 49°F.
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The Mid-Week Cool Down
Wednesday is when the vibes shift. We drop from that mid-70s peak down to 70°F, and the clouds start rolling in. It won't be a washout—the precipitation chance is only about 10%—but you'll definitely notice the lack of sun.
Then comes Thursday, January 22.
High of 66°F.
Low of 48°F.
Basically, the "I need a real jacket" threshold for most of us.
Will It Actually Rain?
The big question everyone asks during a Moreno Valley winter is about the wet stuff. We’ve seen some wild atmospheric rivers earlier this month, but the next ten days look mostly dry with one specific exception. Saturday, January 24, is the day to watch. While the high is a mild 67°F, there’s a legitimate 20% chance of light rain moving in during the evening hours.
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It’s not going to be a flood, but it’s enough to make the 60 Freeway a mess.
The 10-Day Outlook Breakdown
To keep it simple, here is how the numbers are actually trending:
- Jan 18 - 20: Solid mid-70s. Sunny. Great for hiking Box Springs.
- Jan 21 - 23: Cooling trend. Highs drop from 70°F to 63°F. Clouds arrive.
- Jan 24 - 25: Rain threat. Highs stay in the mid-60s. Lows around 48°F.
- Jan 26 - 27: Staying cool. Partly sunny with highs hovering near 66°F-69°F.
The humidity is all over the place too. We’re starting dry—around 22%—but as that moisture pushes in toward the weekend, it’ll spike up to 51% by Friday. That’s that "heavy" air feeling you get right before a storm system moves through the pass.
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What This Means For Your Week
Don't let the 75-degree Sunday fool you into thinking winter is over. By the time we hit next Sunday, January 25, the high will only be 67°F. That’s an 8-degree drop over the week. If you’re sensitive to the cold or you’ve got plants that don’t like the night chill, keep an eye on those Tuesday and Wednesday night lows of 49°F.
Basically, keep the layers handy. You’re going to need the sunglasses for the commute on Monday, but you’ll probably want the umbrella in the trunk by Friday just in case those Saturday night sprinkles decide to show up early.
Stay ahead of the temperature swings by checking your tires now; the pressure always drops when these 20-degree day-to-night shifts happen in the valley. If you're planning on heading up to the San Jacinto mountains, keep in mind that these cool-downs in the valley usually mean much harsher conditions at elevation.
Plan your heavy outdoor chores for the first half of the week while the sun is out and the ground is dry. Once that humidity climbs toward the weekend, the air gets that classic Moreno Valley "chilled to the bone" feel that no amount of coffee can quite fix.