If you’ve lived in Riverside County for a while, you know the vibe. One day you’re wearing a hoodie and wondering if the "Big One" (rain-wise) is coming, and the next you’re squinting at the sun like it’s mid-July.
Today, Thursday, January 15, 2026, is basically one of those perfect "chamber of commerce" days. It’s 79°F outside right now. Honestly, for mid-January, that feels like a total win. We’ve got a 3 mph wind coming from the southwest, and the humidity is sitting at a crisp 24%. It’s dry, it’s warm, and if you’re planning on hitting the wineries later, you couldn't ask for better.
But here’s the thing about the 10 day forecast for temecula ca: it’s not staying this "summer-lite" forever.
The Immediate Outlook: Sun, Then Some Clouds
Tomorrow, Friday, January 16, looks like a carbon copy of today. We’re hitting 79°F again with a low of 51°F. It’s going to be sunny all day, but keep an eye on the evening. It’ll turn cloudy, and there’s a tiny 10% chance of rain. Nothing to cancel your plans over, but maybe don't leave the car windows down.
Saturday keeps the heat around 78°F, though the clouds start moving in a bit more. By Sunday, we’re looking at 76°F. It’s a slow slide, but you can feel the shift coming.
The Breakdown (In Prose, Because Tables Are Boring)
Monday, January 19, marks the real transition. We’re dropping to 75°F. Still beautiful, mostly sunny, but those lows are staying steady at 50°F. If you’re out after sunset, that 25-degree drop hits different.
Tuesday stays in the 74°F range. Wednesday is where the "winter" part of January finally remembers to show up. We’re looking at 70°F with a lot more cloud cover. Humidity jumps up to 39%, so that dry Santa Ana feel is basically gone.
Why the Second Half of the Week is Different
The 10 day forecast for temecula ca shows a pretty distinct "cooling cliff" starting Thursday, January 22. We’re talking 67°F for the high and a chilly 48°F for the low.
Friday, January 23, is actually the coldest day on the radar. 65°F. For some of you, that’s "break out the parka" weather. For the rest of us, it’s just a reminder that we aren't in San Diego. The humidity peaks here at 59%, so it’ll feel a bit damp even if the rain chance stays low at 10%.
- Thursday (Jan 15): 79°F / 51°F (Sunny)
- Friday (Jan 16): 79°F / 51°F (Sunny/Cloudy night)
- Saturday (Jan 17): 78°F / 50°F (Mostly sunny)
- Sunday (Jan 18): 76°F / 50°F (Cloudy)
- Monday (Jan 19): 75°F / 50°F (Mostly sunny)
- Tuesday (Jan 20): 74°F / 50°F (Sunny)
- Wednesday (Jan 21): 70°F / 51°F (Cloudy)
- Thursday (Jan 22): 67°F / 48°F (Partly sunny)
- Friday (Jan 23): 65°F / 48°F (Partly sunny)
- Saturday (Jan 24): 70°F / 49°F (Back to sunny)
What This Means for Your Weekend
If you have people coming into town for the weekend of the 17th and 18th, tell them to pack layers. Honestly, it’s the only way to survive Temecula in the winter. You’ll want a t-shirt at 1 PM and a puffer jacket by 6 PM.
The UV index is staying pretty low (around a 2 or 3), so you won’t sizzle, but the sun is still strong enough to be annoying if you’re driving west on the 79.
The wind is also pretty chill for the next 10 days. We’re seeing speeds between 4 and 6 mph. After those gnarly Santa Anas we had earlier in the month, this is a huge relief. No more chasing your trash cans down the street.
Quick Tips for the Next 10 Days
- Hydrate your plants: It’s been dry. With humidity dipping into the 20s this week, your outdoor pots are going to need some love before the "cool" moisture hits next Wednesday.
- Wine Country Planning: This coming Saturday is the "sweet spot." 78°F and mostly sunny is peak tasting weather.
- Check the Car: Those 48°F nights can trigger your tire pressure sensors. Don't freak out if the light comes on Friday morning; it’s just the cold.
The 10 day forecast for temecula ca wraps up with a little rebound. By Saturday, January 24, we’re back up to 70°F and clear skies. It seems like the valley just can't stay cold for long.
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Actionable Insight: Plan your outdoor heavy-lifting or hiking for the end of next week (Thursday/Friday) when the temps drop into the 60s. It’ll be way more comfortable than doing it in this 79°F heat. For anything social or sun-related, hit it hard this weekend before the clouds roll in on Sunday.