Honestly, if you’re looking at a 10-day weather report for Phoenix Arizona right now, you might think the app is glitching. It’s mid-January. Usually, we’re hunting for that one light denim jacket we own, but the current numbers are looking a lot more like late March.
We’re staring down a stretch of weather that feels suspiciously like a "false spring."
The Valley is currently basking in a high-pressure ridge that is basically acting like a giant warm blanket over Maricopa County. While the rest of the country is fighting off slush and gray skies, Phoenix is hitting the upper 70s. Tomorrow, January 15, we might even tickle the 80°F mark. That is roughly 12 to 14 degrees above the "normal" high for this time of year, which usually sits around a crisp 66°F.
Breaking Down the 10-Day Weather Report for Phoenix Arizona
If you’re planning a hike at Camelback or just trying to figure out if you can finally turn off the heater, here is the day-by-day vibe for the next week and a half.
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The Heat Peak (Jan 14 – Jan 16) Today and tomorrow are the heavy hitters. We’re looking at 79°F to 80°F with nothing but sun. It’s perfect for patio dining, but don't let the daytime heat fool you. The desert is still a desert. Once that sun dips behind the White Tank Mountains, the mercury is going to plummet. We’re talking 47°F to 52°F at night.
The Cloud Pivot (Jan 17 – Jan 20) By the weekend, things get a bit more "wintery" by Arizona standards. We’ll see some high-altitude clouds rolling in. Saturday and Sunday should hover around 74°F. It’ll feel a little more humid—though 19% humidity is still "chapstick weather" for most people. There's a tiny 10% chance of rain on Sunday and Monday, but honestly, in Phoenix, a 10% chance usually just means your car gets dusty from three raindrops.
The Slow Fade (Jan 21 – Jan 23) As we head toward the end of next week, the ridge starts to break down. We’ll slide back into the low 70s and eventually the upper 60s. By Friday, January 23, we’re looking at a high of 68°F. That’s much closer to our historical averages.
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Why the "Normal" Weather is Disappearing
You’ve probably noticed that "winter" in the city isn't what it used to be. Chris Dunn from 12News recently pointed out that the urban heat island effect is basically swallowing our cold nights. All that concrete and asphalt we’ve laid down from Buckeye to Queen Creek soaks up the sun all day. At night, instead of the heat escaping into space, the city radiates it back at us.
In the 1970s, Phoenix would see about six nights of freezing temperatures ($32°F$ or lower) at Sky Harbor. Lately? We’re lucky to get one. This year, the 10-day weather report for Phoenix Arizona shows lows staying well into the 40s and 50s. Great for your citrus trees, maybe less great for the long-term water table.
Surprising Details Most People Miss
People think Phoenix weather is boring because it's "just sun." That’s a mistake. January is actually a pretty volatile month if you look at the history.
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- The Record Highs: Back in 2025, we hit 81°F on January 3rd. We are currently pacing to challenge some of those record-breaking daily highs this week.
- The UV Trap: Even though it’s "only" 75°F, the UV index is hitting a 3. That’s moderate. If you’re out on the Apache Wash Trail for three hours without sunscreen, you will get a burn. The thin desert air doesn't offer much protection.
- The Wind Factor: We’re expecting some light breezes—around 6 to 9 mph—mostly coming from the East/Northeast. It’s not enough to knock over a patio umbrella, but it’s enough to make 70°F feel like 65°F if you’re in the shade.
What This Means for Your Wardrobe
This is the "On-Off" season. You leave the house at 7:00 AM and it’s 48°F. You’re wearing a hoodie and maybe a beanie. By lunchtime, it’s 78°F and you’re sweating.
The move is always layers. A light windbreaker over a t-shirt is the unofficial uniform of Phoenix in January. Also, keep the polarized sunglasses handy. The winter sun sits lower on the horizon, which makes the glare on the I-10 during afternoon rush hour absolutely brutal.
Practical Steps Based on This Forecast
- Water Your Plants Early: Since we’re hitting 80°F with very low humidity (24%), your potted desert plants will dry out faster than you think. Water them in the morning before the sun gets high.
- Plan Outdoor Events for Jan 15-17: These are your "goldilocks" days. If you have a yard project or a golf outing, do it before the clouds and slight rain chances move in on Sunday.
- Check Your Tire Pressure: Huge temperature swings (from 80°F days to 47°F nights) cause air to expand and contract. Don't be surprised if your "low tire" light pops on during a chilly morning this week.
- Hike Early or Late: If you’re hitting the trails, aim for the 9:00 AM window. It’s warm enough to be comfortable but early enough to avoid the direct overhead sun of the 2:00 PM peak.
The big takeaway from this 10-day weather report for Phoenix Arizona is that the desert is currently in its prime. We are avoiding the "Deep Freeze" predicted for the eastern part of the Southwest by the Old Farmer's Almanac, at least for now. Enjoy the warmth, keep a sweater in the car for the evenings, and don't forget to hydrate. Even when it's beautiful out, the desert is trying to dry you out.