Have a question? Need an Estimate?

725-502-3114

What a Patio Cover Does and Does Not Do in Las Vegas Heat

Written October 8, 2026. Temperature counts run through October 7, 2026.

Key Takeaways:
The normal July high at the Las Vegas airport is 104.5°F, a normal year has 78 days at 100°F or hotter, and the record is 120°F, set on July 7, 2024.
A patio cover does not cool the air. It takes the sun off you and off the slab. In a Phoenix hospital study, concrete in the sun peaked at 136 to 140°F and concrete in shade peaked at 102°F.
Lattice gives about 40% to 60% shade and lets air move through. A solid cover blocks all direct sun. An insulated cover adds a 3-inch foam core under the hot top skin.
A west-facing patio is the hard case. At 5 PM in mid-July the sun over Las Vegas is 34 degrees above the horizon and due west, so it shines in under the front edge of the roof.

How hot does it get in Las Vegas, in numbers?

Hot enough that the normal July high is 104.5°F and the normal July low is 82°F. These are the figures for Harry Reid International Airport, the weather service's Las Vegas station.

MeasureLas Vegas airport
Normal July high104.5°F
Normal July low82.0°F
Days at 100°F or hotter in a normal year78
Days at 110°F or hotter, 1991 to 2020 average9 to 10
Days at 110°F or hotter in 202436
Days at 110°F or hotter in 2026, through October 723
Hottest day on record120°F, July 7, 2024

The normals are NOAA's 1991 to 2020 set. The 110-degree counts are ours, added up from the weather service's daily highs. The weather service's record report for that day says 120°F passed the old all-time mark of 117°F, which had been reached five times, and that Las Vegas records go back to 1937. The hottest day of 2026 so far was 115°F on August 1.

For a patio, the clock matters as much as the high. NOAA's hour-by-hour normals for July put the hottest part of the day between 4 and 5 PM. The normal temperature is still 100.6°F at 7 PM and 95.9°F at 9 PM. The hours most people want to sit outside, after work and through dinner, start at the hottest point of the day and stay near 100°F until dark.

How hot does an unshaded patio slab get?

Hot enough to burn skin in seconds. The best published measurements come from Phoenix, where hospital doctors have measured hot ground twice.

In the first study, done at Maricopa Medical Center and published in 1995, asphalt and sand peaked at about 154°F, and dirt, concrete and steel peaked at 136 to 140°F. Shade brought the concrete peak down to 102°F. In August 2018 the Arizona Burn Center repeated the readings for three weeks with an infrared thermometer. Sidewalk readings at noon had a median of 129°F and ran as high as 140°F. By 6 PM the sidewalk median had come down to 111°F.

In the burn research that paper cites, skin gets a second-degree burn in 5 seconds at 140°F and in 15 minutes at 122°F.

Las Vegas has its own evidence. Doctors at the UNLV School of Medicine reviewed five years of pavement burn admissions at the Lions Burn Care Center at University Medical Center and found 173 cases. More than 88% happened when the air temperature reached 95°F or higher, and the rate climbed exponentially as the daily high rose.

Neither Phoenix study names concrete pavers. Treat the concrete figures as a guide and measure your own.

What does a patio cover change, and what does it not?

It takes the direct sun away. It does not cool the air.

The air under a cover is the same hot air that is over the rest of the yard. What changes is everything the sun was heating: your skin, the slab, the furniture, the wall and the glass behind you. The National Weather Service says its heat index values were devised for shady, light wind conditions, and that full sunshine can raise them by up to 15°F. Shade takes that penalty away. It does not take you below the day's temperature.

The slab is where shade pays the most. In the Phoenix numbers above, concrete in shade peaked 34 to 38 degrees lower than concrete in sun. The same paper notes that paved surfaces absorb and hold heat through the day and give it back in the evening. A slab that sat in shade all afternoon has less heat to give back at dinner time.

A cover also shades the house. Over a west-facing or south-facing wall with windows or a sliding glass door, it blocks direct sun from reaching the glass and the wall.

Lattice, solid or insulated: which is cooler underneath?

Insulated is the coolest to sit under, solid is next, and lattice gives the least shade and the most air. Our comparison of the three has the rest. This is the heat side only.

On a phone, swipe the table sideways to see every column.

CoverShadeHeatRain
LatticeAbout 40% to 60%, set by the spacingOpen roof, air moves throughPasses through
SolidBlocks 100% of direct sunThe aluminum panel heats up and radiates some heat downWatertight
InsulatedBlocks 100% of direct sunA 3-inch foam core interrupts the heat path to the ceilingWatertight

Lattice. On a lattice cover, an open roof of spaced aluminum tubes, the shade number comes from the spacing. The Four Seasons Elitewood brochures, using 2-inch by 2-inch tubes, list 60% shade at 2-inch spacing, 50% at 4-inch spacing and 40% at 6-inch spacing. The shade pattern moves across the patio as the sun angle changes. Lattice suits a pool deck. It is not ideal on a west-facing patio that takes direct afternoon sun.

Solid. A solid cover gives full shade, but aluminum is a conductor. The panel absorbs solar energy and re-radiates heat downward. That radiant heat takes back part of what the shade gave you.

Insulated. We install Four Seasons Elitewood insulated covers. The panel is a 3-inch core of expanded polystyrene foam sandwiched between two aluminum skins. The foam interrupts the heat path from the sun-facing surface to the underside of the panel. Four Seasons lists its insulated patio covers as "much cooler than metal panels".

Why is a west-facing patio the hard case?

Because during the hottest hours the sun is low and directly in front of it, so the light comes in under the roof.

We ran NOAA's solar calculator for Las Vegas on July 15. At 1 PM the sun is 75 degrees above the horizon, and a roof casts its shadow almost straight down. Then the sun drops and swings west:

  • 4 PM: 46 degrees up, just south of due west.
  • 5 PM: 34 degrees up, due west.
  • 6 PM: 22 degrees up, a little north of due west.
  • 7 PM: 10 degrees up. Sunset is at 7:58 PM.

Turn those angles into feet. On a patio that faces west, for every foot of height at the front edge of the roof, the sun reaches about 1 foot back under it at 4 PM, about 1.5 feet at 5 PM and about 2.5 feet at 6 PM. If the front edge is 8 feet above the slab, that is 12 feet of sunlit floor at 5 PM and 20 feet at 6 PM. Under a roof 12 feet deep, the sun line is at the back wall by 5 PM.

That is why more depth alone does not fix a west exposure. Three things help: a lower front edge, a solid or insulated roof instead of lattice, and something upright on the west side, such as a wall, a hedge or a screen. Our sizing guide covers projection in more detail.

A south-facing patio does well at midday, when the sun is high, and takes side sun at its west end late in the day. An east-facing patio is the easy one, because by late afternoon the house is between the patio and the sun. A north-facing patio still gets low evening sun in midsummer: on July 15 the sun sets about 28 degrees north of due west.

Do fans and misters help under a patio cover?

Both help, and both have limits at Las Vegas temperatures.

Fans. ENERGY STAR puts it plainly: ceiling fans cool people, not rooms. The moving air creates a wind-chill effect on your skin. It does not lower the temperature. The weather service's heat safety page adds a caution for very hot air: do not point a portable fan at yourself when the room is hotter than 90°F, because the dry blowing air will dehydrate you faster. That is the limit of a fan alone on a 105-degree afternoon. On our insulated covers the wiring for a fan runs inside the panel, and the fans we install are rated for damp or outdoor locations. Our post on planning fans, lights and electrical has the details.

Misters. Evaporating water does cool, and dry air is where it works. The normal July dew point at the airport is in the low 40s, which is dry. Arizona State University researchers measured misters at five restaurant patios in Tempe at midday. Comfort improved most with mist and shade together. With both, the feels-like index they used, called UTCI, dropped by 9.7°C, which is about 17°F.

The limits are local. Our tap water is very hard. The Las Vegas Valley Water District lists it at 291 parts per million, or 17 grains per gallon, and notes that mineral residue is left where water evaporates. A mister evaporates water on purpose, so expect white spots on any glass, furniture or posts the mist reaches. Wind is the other limit. The normal July afternoon wind at the airport is about 11 mph, enough to carry a fine mist off the patio.

What can I measure on my own patio before deciding?

Four things, on one hot afternoon, with a phone, a tape measure and an infrared thermometer. They are worth having before you talk to any contractor.

  1. Which way the patio faces. Stand with your back to the house wall and read the compass on your phone.
  2. The slab in sun and in shade. At about 2 PM and again at 5 PM, read the slab in full sun, then a spot that has been in the shadow of the house. The gap between your two readings is what shade is worth on your patio.
  3. The sun line at the hour you use the patio. If you eat outside at 6 PM, look at 6 PM. Mark how far the sun reaches toward the house. For a cover that is not built yet, use the rule above on a west-facing patio: front-edge height times 1.5 at 5 PM, times 2.5 at 6 PM.
  4. Where the glass is. Note every west-facing or south-facing window and sliding door the cover could shade.

Those four notes settle most of the design: lattice or solid, how deep, and whether the west side needs more than a roof. Every project of ours starts with a free on-site estimate, where we look at the patio layout, sun exposure and HOA requirements.

When is a patio cover not enough?

On the worst days, shade is not protection. The Southern Nevada Health District counted 513 heat-associated deaths in Clark County in 2024 and 284 in 2025. It had registered 255 for 2026 as of September 30, a preliminary number. The district's annual reports say the majority of these deaths occur outdoors.

A covered patio on a 112-degree afternoon is still in 112-degree air. When the weather service has an extreme heat warning out, use the house, and use the patio after dark.

Frequently asked questions

How much cooler is it under a patio cover in Las Vegas?

The air is not cooler, but the surfaces are. In a Phoenix hospital study, concrete in shade peaked at 102°F while concrete in sun peaked at 136 to 140°F. The National Weather Service says full sunshine can raise heat index values by up to 15°F.

What is the hottest temperature ever recorded in Las Vegas?

120°F on July 7, 2024, at the airport. The old record was 117°F, and Las Vegas records go back to 1937.

How many days a year does Las Vegas reach 100°F?

A normal year has 78 days at 100°F or hotter, by NOAA's 1991 to 2020 normals. By our count of the daily highs, 2024 had 36 days at 110°F or hotter.

Is a lattice cover enough for a west-facing patio?

Usually not. Lattice gives about 40% to 60% shade, and it is not ideal on a west-facing patio that takes direct afternoon sun. A solid or insulated cover blocks 100% of direct sun.

Do misters work on a Las Vegas patio?

Yes, dry air is where misters work, and a study of Tempe restaurant patios found comfort improved most with mist and shade together. Las Vegas tap water is very hard, so expect mineral spots where mist lands and dries.

Will a ceiling fan cool my patio?

A fan cools people, not the space. It creates a wind-chill effect on skin and does not lower the air temperature.

Related City Seamless resources

Planning a patio cover? Request a free on-site estimate or Call or Text 725-502-3114.

About City Seamless Patio Covers

Company: City Seamless Patio Covers, family-owned in Las Vegas, with trade roots dating to 1976
Nevada Contractor Licenses: #0081882 and #0082656
Awards: Best of Las Vegas, Las Vegas Review-Journal, 2024 and 2025 (Patio Covers)
Products: Alumawood and Four Seasons Elitewood patio covers: lattice, solid, insulated, combination and freestanding
Permits: Handled by City Seamless, from application through final inspection
Contact: Call or Text 725-502-3114 | cityseamlesspatiocovers.com

Sources