Month by month
Las Vegas weather in July
The hottest month: 100°F afternoons are the norm and nights stay warm.
At a glance
July is the peak of the heat, and it holds the all-time record of 120°F set on July 7, 2024. Even the early morning is warm. In July and August, the NWS says monsoon moisture typically pushes into the Mojave Desert, raising humidity and setting off scattered thunderstorms that usually form over the surrounding mountains and move into the valley. The hourly normals show the jump: dew points in July run well above June’s. Storm winds can do damage, but the bigger danger is flash flooding in normally dry washes and low-lying streets.
By NOAA’s 1991–2020 normals for Harry Reid International Airport, July days peak around 105°F and nights bottom out near 82°F. An average July has 25.8 days at 100°F or hotter and 30.6 days at 90°F or hotter. Normal rainfall is 0.38 inches, with 2.5 days getting at least a hundredth of an inch and 1.0 days getting a tenth of an inch or more. The median July total is 0.21 inches, so in a typical year it is drier than the average suggests: a few wet years pull the average up.
Through the day
Get outside early. The coolest hour is around 6 a.m. at 82°F on average, and by 9 a.m. the normal temperature has already reached 90°F. The afternoon peak, around 4 p.m., averages 103°F, and on one afternoon in ten it tops 110°F. Evenings cool slowly: 9 p.m. still averages 96°F, so a late walk is warm but far easier than mid-afternoon.
| Time (PDT) | Normal | Cool day | Hot day |
|---|---|---|---|
| 6 a.m. | 82°F | 76°F | 89°F |
| 9 a.m. | 90°F | 84°F | 96°F |
| Noon | 98°F | 91°F | 105°F |
| 3 p.m. | 102°F | 94°F | 109°F |
| 6 p.m. | 102°F | 94°F | 109°F |
| 9 p.m. | 96°F | 89°F | 102°F |
| Midnight | 90°F | 83°F | 96°F |
"Cool day" and "hot day" are NOAA’s 10th and 90th percentiles for that hour: one July day in ten is cooler or hotter than shown. NOAA publishes hourly normals in standard time; we shifted them to clock time for daylight saving time. Hourly averages run a little below the normal daily high because the hottest moment doesn’t land on the same hour every day.
Humidity is up: the average dew point across the day is about 43°F, well above early summer, because monsoon moisture has arrived. Sweat evaporates more slowly, so the heat is harder on the body. Wind averages 8.8 mph over the day and is usually strongest around 7 p.m. (11.7 mph on average).
Over the month
July isn’t one temperature. The normal high climbs from 103.3°F on July 1 to 104.5°F on July 31, and the normal low goes from 80.1°F to 82.5°F. That’s a small change, so the whole month feels much the same.
For a specific date, the live National Weather Service forecast on our home page is more useful than any average once you are within a week of your trip.
What to pack
- The lightest, loosest clothing you own, plus a wide-brimmed hat
- Sunscreen, sunglasses and an insulated water bottle
- Shoes that can handle very hot pavement
- A light layer for air-conditioned rooms
Staying safe
Heat. Heat is the deadliest weather hazard in the Southwest, according to the NWS. Drink water before you feel thirsty, avoid strenuous activity in the afternoon, and know the warning signs: heavy sweating, cramps, dizziness and nausea point to heat exhaustion, while confusion and hot skin can mean heat stroke, which is a 911 emergency. Our heat-safety guide has the NWS first-aid steps and where to find cooling stations.
Monsoon storms and flash floods. Storms often start over the mountains and send water into the valley’s washes and low streets, sometimes miles from where the rain fell. Never drive into a flooded road: the NWS says about a foot or two of moving water can float most vehicles. Stay out of washes and tunnels during and after storms, and when thunder roars, go indoors.
For current watches and warnings, follow the NWS Las Vegas office. Our resources page lists the other agencies worth knowing. In an emergency, call 911.
July records
| Record | Temperature | Date |
|---|---|---|
| Hottest | 120°F | Jul 7, 2024 |
| Coldest | 56°F | Jul 21, 1940 |
| Warmest night | 95°F | Jul 1, 2013 |
| Coolest day | 81°F | Jul 8, 1992 |
NWS Las Vegas records since January 1, 1937. Where a record has been tied, we show the most recent date. See every month on our records page.