You’ve finally booked the trip. The flights are set, the hotel on the Strip is confirmed, and you’re ready to see if Lady Luck is on your side. But then you check the 15 day forecast for las vegas and realize... wait, is it actually going to be cold?
Honestly, most people treat Vegas like it’s a permanent sauna. They pack shorts and flip-flops in January and then end up spending $80 on a souvenir hoodie because the desert at night is no joke. I’ve seen it a thousand times. If you're looking at the next two weeks, specifically starting this Sunday, January 18, 2026, you're looking at a classic winter-in-the-desert mix.
It’s sunny, sure. But it’s also crisp.
The Reality of the Next Two Weeks
Right now, the current temperature is sitting at a comfortable 62°F with 18% humidity. It’s mostly cloudy today, but don't let that fool you into thinking a storm is brewing. The chance of rain today is only 10%.
Basically, the "winter" vibe is in full swing.
If you're heading out this week, here is the breakdown of what the sky is actually doing. Sunday is hitting a high of 64°F and dipping to a chilly 41°F at night. Monday, January 19, actually warms up a bit with a high of 68°F. That's probably your best day for a long walk down the Strip without needing a heavy coat. But keep an eye on the wind—it’s picking up to 11 mph from the north on Monday.
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Mid-Week Shifts and Cooling Trends
By Tuesday, things start to settle into a cooler pattern.
We’re looking at:
- Tuesday, Jan 20: Sunny, high of 60°F, low of 42°F.
- Wednesday, Jan 21: Cloudy, high of 59°F, low of 42°F.
- Thursday, Jan 22: Cloudy, high of 58°F, low of 46°F.
That three-day stretch is going to feel a bit "grey" for Vegas standards. You’ll want to plan your indoor activities then. Think High Roller, a Cirque show, or just hitting the tables. The humidity stays low, around 23-24%, so even if it’s cloudy, it’s that dry kind of cold that sneaks up on you.
Why the "Low" Number Matters More Than the "High"
In the desert, the sun is a giant space heater that turns off the second it hits the horizon. You might see 64°F on the 15 day forecast for las vegas and think "perfect sweater weather."
And it is. Until 5:00 PM.
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Once the sun drops, the temperature craters. For instance, on Friday, January 23, the high is 56°F. That’s already on the cooler side. But the night drops to 44°F. If you are standing outside the Bellagio watching the fountains at 9:00 PM, that 44°F feels a lot colder because of the open air and the wind coming off the water.
Planning Your Second Week (Jan 24 - Jan 28)
Heading into the following weekend, the sun makes a comeback. Saturday, January 24, looks gorgeous with a high of 60°F and sunny skies. It’s followed by a string of "partly sunny" days.
The highs stay remarkably consistent:
- Sunday: 59°F
- Monday: 61°F
- Tuesday: 64°F
- Wednesday: 60°F
Honestly, it’s pretty predictable. No massive rain events (10% or less chance throughout) and very little wind after that Monday spike. It’s the kind of weather where you can actually enjoy Red Rock Canyon or a trip to Hoover Dam without melting into the pavement.
What to Actually Put in Your Suitcase
Forget what you think you know about "desert weather." If you are looking at this 15 day forecast for las vegas, you need layers. A leather jacket or a stylish bomber is the gold standard here. You’ll wear it every single evening.
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Bring a scarf. It sounds extra, but when you're walking between casinos and the wind tunnels between the buildings hit you, you'll be glad you have it. Also, moisturizing is non-negotiable. With humidity hovering between 16% and 36% over the next two weeks, your skin will feel like parchment paper within 48 hours.
Pack a mix of long-sleeve tees and maybe one "nicer" coat if you’re doing fine dining. Most casinos are heavily air-conditioned anyway, so even if it's 68°F outside, it might feel like 62°F inside the Wynn.
A Quick Word on the UV Index
Even though it’s January and the temperatures are in the 50s and 60s, the UV index is still hitting 2. That’s low, but if you’re fair-skinned and spending four hours walking the Strip, you can still get a "Vegas glow" you didn't ask for. Wear the sunglasses. The glare off the glass buildings is intense.
Final Practical Tips for Your Trip
Check the wind speeds specifically if you plan on doing a helicopter tour of the Grand Canyon. While 2-4 mph is the average for most of this forecast, that 11 mph wind on Monday might make for a bumpier ride.
Also, don't let the 10% rain chance scare you off. In Vegas, a 10% chance usually means a few drops hit your windshield and then evaporate before they touch the ground. It’s rarely a "ruined day" situation.
Actionable Next Steps:
- Pack a versatile outer layer: A mid-weight jacket is essential for those 40-degree nights.
- Book outdoor excursions for Jan 19 or Jan 27: These look like the warmest, sunniest windows in the current 15-day outlook.
- Hydrate inside and out: Bring high-quality lotion and a reusable water bottle; the dry air is more taxing than the temperature itself.
- Plan indoor transitions: On the cloudier days (Jan 21-22), use the Monorail or interior walkways to move between properties to stay warm.