Las Vegas in September: Weather, Crowds, Prices and What to Do

LAS VEGAS · SEPTEMBER · 36.08° N

September is the month the Las Vegas thermometer starts giving ground. The 1991-2020 normals from NOAA’s National Centers for Environmental Information put the average high at 94.9°F and the average low at 72.4°F, measured at Las Vegas McCarran Airport on the valley floor. August, at the same station, averages 102.8°F. That 7.9°F is the whole reason a trip lands in September instead of four weeks earlier.

What the month gives a traveler is a usable morning and a warm night. What it takes away is any pretense that midday belongs outdoors: the afternoon still runs in the mid-nineties, and rain almost never interrupts it, with 0.32 inch of normal precipitation for the entire month. If your dates are still open, the twelve-month view sits in our best-time guide.

On this page

• Average highs, lows and rain days94.9°F, 72.4°F and 0.32 inch
• How hot is it day and night?A 22.5°F swing between dawn and afternoon
• Crowds, hotel prices and lodging taxWhat we verified and what we did not
• Things to do in SeptemberRed Rock Canyon, Valley of Fire, Lake Mead
• A two-day itinerary around the heatSunrise at 6:22 am, pool at 1 pm
• September vs August and October102.8°F, 94.9°F and 81.2°F
• Is September a good time to visit?Yes for a pool weekend, no for midday hiking

One number steers the whole trip: 94.9°F in the afternoon against 72.4°F at dawn. Every booking decision below, from the flight time you pick to the hotel you want a pool deck at, falls out of that gap.

Las Vegas weather in September: average highs, lows and rain days

Every figure here comes from NOAA NCEI’s 1991-2020 monthly normals for station USW00023169, a real thermometer at Las Vegas McCarran Airport rather than a gridded reanalysis cell. That matters for where you point it: the station sits on the valley floor, and both the open desert around the city and the Spring Mountains above it run cooler after dark than the Strip does. Take 94.9°F and 72.4°F as airport readings, and expect a resort courtyard ringed by concrete to hold heat a little longer.

Rain is close to a non-event. The normals count 0.7 days in an average September with at least a tenth of an inch, which works out to roughly seven such days per decade, and zero days reaching a full inch. In practice that means a monsoon-tail cell can darken an afternoon, drop water on one side of the valley for twenty minutes, and leave the rest of your day untouched. Nobody packs a raincoat for this month.

The day-night spread is 22.5°F, and it decides what goes in the day bag. A 6:30 am start near 72°F needs nothing but water and sun cover; the same body at 3 pm wants shade, a refill and a hat with a brim. Anyone eating outdoors after dark will be fine in short sleeves, though the air-conditioned interiors of casinos, theaters and airport gates run cold enough that a light layer stays in the bag all day.

Daylight on September 15 runs 12 hours 26 minutes, with the sun up at 6:22 am and down at 6:48 pm local time (calculated from sunrise-sunset.org and converted to Pacific Daylight Time). Golden hour lands right when you want it: the desert west of town photographs beautifully in the last forty minutes, and you can be back on the Strip for a 7:30 pm table without driving in the dark.

How hot is Las Vegas in September, day and night?

The month’s averages bracket at 94.9°F and 72.4°F, a spread of 22.5°F between the afternoon peak and the coolest hour before sunrise. Neither figure is an extreme: they are the middle of thirty Septembers, so individual days land above and below. A 100°F afternoon in the first week and an 85°F one in the last are both entirely inside that average.

Dressing for it is a two-shift job. Mornings up to about 10 am sit in the seventies and low eighties, which is walking weather for the Fremont Street blocks or a trailhead parking lot. From noon to roughly 5 pm, the sensible plan is water, shade or a pool, and a car with working air conditioning if you are out of town. Evenings hold in the high seventies and low eighties well past sunset at 6:48 pm, which is why September dinners happen on patios.

Frost does not enter the conversation: the September average low of 72.4°F sits forty degrees above freezing. We read no daily-extreme series for the station, so we count no record cold nights and give no minimum beyond the monthly normal. The cool-night question belongs to the winter months, not this one.

How busy is Las Vegas in September? Crowds, prices and lodging tax

Our sources for this month cover the thermometer and the clock. We found no hotel occupancy series and no monthly room-rate data for Las Vegas, so we crown no month cheap or expensive and quote no nightly figure. The one seasonal lever we can measure is the air, and it moves fast in September: 7.9°F down from August, another 13.7°F to go before October. Demand in a convention city tracks its own calendar, and we did not verify that calendar.

Booking advice here is ours, not a data reading. If a specific Saturday night is fixed, lock the room before the flight, since weekend rates in this city move on events we cannot predict from normals. Hold refundable rates while you watch, and if the trip is built around a pool, confirm in writing that the pool is open for your dates: several resorts close decks in the fall, and the closing week varies by property.

We could not verify the Clark County lodging-tax rate or any resort-fee schedule, so we give no percentage and no dollar amount. The practical move costs nothing: ask for the all-in nightly total, taxes and mandatory fees included, before you confirm, and do the same for parking if you are renting a car to get out to the desert.

Where extra money changes September specifically is shade and wheels. A room at a property whose pool deck has real shade converts the worst four hours of a 94.9°F day into the best ones, and a rental car with cold air makes the 6:30 am departures that this month rewards actually happen. Paying up for a higher floor or a Strip view changes the photographs, not the temperature.

Things to do in Las Vegas in September

September is the first month of the second half of the year when a desert morning is genuinely comfortable. At an average low of 72.4°F, a 7 am trail start feels like a spring day somewhere else, which August, at 80.6°F before sunrise, does not offer. October gives cooler mornings still, at 59.6°F, but loses the warm night that lets you eat outside at nine. Only September holds both ends.

Three places take the early hours out of town: Red Rock Canyon National Conservation Area and its one-way scenic drive to the west, Valley of Fire State Park to the northeast, and Lake Mead National Recreation Area east behind Hoover Dam. We could not verify current entry fees, timed-entry rules or gate hours for any of the three, so we quote none, and each publishes its own before you drive out. Inside the city, the Strip and the Fremont Street canopy downtown carry the walkable, ticket-free hours.

What September changes at those sites is the air, not the rock. The sandstone and the reservoir are where they were in August; the difference is that the drive back at 11 am starts from the mid-eighties instead of the mid-nineties, and the parking lot you return to has not spent five hours at 102.8°F. We read no water-temperature series for Lake Mead, so we give no swimming figure.

We found no verified free-admission days, festival dates or event programs in Las Vegas for September, so we list none and you should treat any you see elsewhere as worth checking with the organizer. The hours that reliably cost nothing are the early ones, from sunrise at 6:22 am until the heat arrives, plus the long warm evening after 6:48 pm on the sidewalks.

Las Vegas in September: a two-day itinerary

Day one runs on the sun. Coffee at 6, on the road west by 6:45 with the light already up, one walking hour while the air sits near 72°F, back at the hotel before 11 as the climb toward 94.9°F gets serious. Lunch indoors, pool or shade from 1 to 4, a nap that nobody has to justify. Out again at 6 for the last twenty minutes of daylight, dinner on a patio after sunset at 6:48 pm.

Day two flips the geography and keeps the clock: downtown on foot before 10, museums and air conditioning through the afternoon, the Strip after dark. If a monsoon cell does turn up, and the normals give it 0.7 days of the month, move the indoor block earlier and walk in the cooled air behind the rain. A full inch of rain has never been part of a normal September here, so no itinerary needs a rain day built in.

Las Vegas in September vs August and October

All three months come from the same NOAA NCEI 1991-2020 normals at the airport station, so the comparison is apples to apples. September afternoons run 7.9°F below August and 13.7°F above October; nights run 8.2°F below August and 12.8°F above October. Wet days are near-identical, at 0.7 for August and September and 1.0 for October. There is no coastal water to compare in southern Nevada, and we found no monthly lake-temperature series, so no swim figure appears in any column.

Shift four weeks later and you gain a genuinely cool morning at 59.6°F, comfortable all-day hiking, and one more day with measurable rain. You lose the warm night: October evenings cool quickly, and the pool stops being the point of the afternoon. Shift four weeks earlier and August hands back 102.8°F days and 80.6°F nights, which turns any plan outside a car or a pool into a logistics problem.

Is September a good time to visit Las Vegas?

Yes, for a pool-and-evening trip, a long weekend built around a show, or a first visit where the desert gets one early morning and the rest of the day happens indoors. No, if the point of the vacation is hiking, cycling or a full day on foot: 94.9°F afternoons with almost no cloud cover will beat that plan by Tuesday.

Hikers should move to October, where the average high drops to 81.2°F and the average low to 59.6°F, at the cost of one extra wet day and much shorter warm evenings. Anyone chasing the cheapest possible room should ignore both recommendations from us, because we have no rate data to give and will not guess a price curve we cannot see.

The thing September alone delivers is a 72.4°F night attached to a morning cool enough to walk in, four weeks before the desert turns the evening cold.

The last word

Book the September trip if you want the desert at 6:22 am and a patio dinner at nine, and give up on the middle of the day before you arrive rather than after. One figure worth carrying to the booking page: August, September and October all share the same 0.32 inch of normal precipitation, so the choice among them is decided entirely by 102.8, 94.9 and 81.2°F. Check the pool’s closing date with the hotel, then pick your flight for a morning landing.

Sources & data for this guide

• September normals (94.9°F / 72.4°F / 0.32 in) · NOAA NCEI monthly normals 1991-2020, station USW00023169, Las Vegas McCarran Airport · checked Sep 15, 2026
• Rain-day counts (0.7 days at 0.10 in, 0.0 days at 1 in) · NOAA NCEI monthly normals 1991-2020, same station · checked Sep 15, 2026
• August and October normals used in the comparison table · NOAA NCEI monthly normals 1991-2020, same station and same period · checked Sep 15, 2026
• Daylight on September 15 (12h 26m, 6:22 am to 6:48 pm PDT) · sunrise-sunset.org, converted from UTC · checked Sep 15, 2026
• We could not verify hotel occupancy, monthly room rates, the Clark County lodging-tax rate or any resort-fee schedule, so this guide gives no price, percentage or seasonal rate ranking.
• We could not verify entry fees, timed-entry rules or opening hours for Red Rock Canyon, Valley of Fire or Lake Mead, and we found no dated September event listings · check each operator when you book.