Mornings sit near the overnight low around 30°C with clear, cooler light — best for outdoor photos before crowds build.
Las Vegas Weather in September
Everything you need to know about Las Vegas weather in September
Updated September 10, 2026
United States · Las Vegas
Las Vegas Weather in September
September in Las Vegas is hot, humid and energetically busy. Expect daytime highs around 37°C (99°F), mild nights around 30°C, long sunny stretches, and the city at its most magical and most crowded Check the full climate tables below for monthly averages and packing cues.
- Avg high / low
- 37°C / 30°C
- 99F / 86F
- Precipitation
- 8mm
- 1 wet days
- Daylight
- 12.5 hrs
- mid-range daylight
Las Vegas average temperatures through the year
SeptemberRest of the year
17°
19°
23°
28°
34°
41°
43°
42°
37°
29°
21°
16°
JAN
3 wet
FEB
2 wet
MAR
2 wet
APR
1 wet
MAY
1 wet
JUN
1 wet
JUL
2 wet
AUG
2 wet
SEP
1 wet
OCT
2 wet
NOV
2 wet
DEC
3 wet
Daytime highs in Celsius with wet days per month for Las Vegas. September sits at 37°C with 1 wet days.
The short answer
September falls in Las Vegas's autumn. Daytime highs average 37°C (99°F) with nights near 30°C (86°F). Precipitation totals about 8mm across roughly 1 wet days. Settling snow is uncommon. Visiting works with flexible outdoor plans and a packing buffer Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
September climate in Las Vegas
Monthly averages for Las Vegas, United States.
- Day high
- 37°C
- 99°F
- Night low
- 30°C
- 86°F
- Precipitation
- 8mm
- 0.3 in
- Wet days
- 1
- rain or drizzle
- Sunrise
- 5:45am
- mid-September
- Sunset
- 6:15pm
- mid-range daylight
- Daylight
- 12.5 hrs
- 10 hrs sunshine
Averages based on long-run monthly climate normals. Last updated September 10, 2026.
Real weeks swing around the 34°C mean. Early September often sits near 36°C while the final week lands closer to 38°C. Pack a spare layer for that 1° drift rather than dressing only for the monthly average Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Rain and drizzle usually arrive in pulses across the 1 wet days. Dry stretches between systems feel clearer and colder overnight. Use those gaps for outdoor sightseeing and keep indoor backups for the wetter clusters Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
What is the average temperature in Las Vegas in September?
The average temperature in Las Vegas in September is around 34°C (93°F), combining daytime highs of 37°C (99°F) with night lows of 30°C (86°F). The month warms steadily: the first days average highs near 36°C, while the final week typically tops out around 38°C with nights of 31°C.
Average daily high and low through September. The month warms by roughly 1 degrees start to finish.
How much does it rain in Las Vegas in September?
Las Vegas gets around 8mm (0.3in) of precipitation in September, spread over roughly 1 wet days. Wet spells typically last a day or two and clear to drier stretches in between Check the full climate tables below for monthly averages and packing cues.
24
16
16
8
8
8
16
16
8
16
16
24
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Average precipitation by month in millimetres. September's 8mm sits near the annual rhythm.
Average precipitation by hour of day in Las Vegas
September precipitation in Las Vegas falls fairly evenly around the clock, with a mild overnight and early-morning peak. There is no predictable afternoon-downpour pattern — check the day's forecast rather than timing outings by the clock Check the full climate tables below for monthly averages and packing cues.
12am6am12pm6pm12am
Relative share of September precipitation by hour of day. The distribution is fairly flat, with a mild overnight peak.
When is sunrise and sunset in Las Vegas in September?
September daylight in Las Vegas averages about 12.5 hours, mid-range daylight. Sunrise drifts from 5:45am to 5:51am across the month, while sunset holds near 6:15pm before edging toward 6:19pm. Plan outdoor sightseeing in the brighter midday window Check the full climate tables below for monthly averages and packing cues.
Sunrise and sunset through September. The shaded band is daylight Check the full climate tables below for monthly averages and packing cues.
How humid is Las Vegas in September?
Relative humidity in Las Vegas in September averages around 25 percent. At 37°C that usually feels manageable outdoors. Temperature and wind still drive packing more than humidity alone Check the full climate tables below for monthly averages and packing cues.
35
30
28
25
22
18
20
22
25
30
35
38
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Average relative humidity by month. September sits near 25%.
What is the weather like in Las Vegas the rest of the year?
Las Vegas moves from cooler months near 16°C highs through a warmer peak near 43°C. The best-weather stretch usually aligns with January and February. September sits in the autumn arc with 37°C highs Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Average high (coral) and low (navy) by month. The shaded band is the typical daily range; SEP is marked.
Is September a good time to visit Las Vegas?
Depends — weather works with flexible plans. Here is the honest trade-off.
OverallSolid with flexible plans
WeatherHot and humid
CrowdsHigh
PricesHigh
Budget (per night)$220 to $350
Book ahead6 to 8 weeks
September in Las Vegas is defined by cooling slightly and 37°C days. Stays often land in the $220–$350 range with high season demand. The smartest move is to book about 6–8 weeks ahead and keep outdoor blocks in the brighter midday window Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Pros
- 37°C highs suit warm days in Las Vegas
- 10h average sunshine for daytime plans
- High crowds shape the September pace
- High season rates for stays and flights
Cons
- 1 wet days can pause outdoor sightseeing
- Humidity at 25% can feel heavier than the air temp
- Hotel rates climb fast mid-month
- Daylight near 12.5 hrs shortens evening walks
Travelling to Las Vegas in September?
Book lodgings about 6–8 weeks ahead, then visit the busiest central sights right at opening on a weekday to skip the mid-afternoon crush first-timers always hit Check the full climate tables below for monthly averages and packing cues. Compare months on our Best Time to Visit Las Vegas guide.
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What September actually feels like
September is Las Vegas's autumn in lived terms: cooling slightly. Most days feel cold, dry and often clear, with damper grey stretches arriving in bursts rather than settling in for the whole month Check the full climate tables below for monthly averages and packing cues.
The underestimated variable is the day–night temperature swing. It truncates outdoor evenings and pushes dinner earlier. Build one indoor spare block every day Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Early September often starts near 36°C while the final week trends toward 38°C. That 1° drift is enough to change coat weight mid-trip. Recheck the forecast before packing day seven Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Afternoons reach 37–38°C before an early sunset near the 12.5-hour daylight limit — plan open-air stops then.
Evenings cool quickly toward 30°C; shift to indoor dining and illuminated streets once the light drops.
September in Las Vegas, week by week
Crowds and prices move more than the thermometer.
September 1–7
36°C (97°F)- Crowds
- High
- Prices
- High season
- Best for
- Quieter weekday exploring
September 8–14
37°C (99°F)- Crowds
- High
- Prices
- High season
- Best for
- Balanced weather window
September 15–21
37°C (99°F)- Crowds
- High
- Prices
- Peak season
- Best for
- Festive peak atmosphere
September 22–30
38°C (100°F)- Crowds
- High
- Prices
- Peak season
- Best for
- Late-month flexible plans
Temperatures are Las Vegas monthly averages split across each window. Individual years vary by several degrees.
What to pack and wear for Las Vegas in September
Light fabric, serious sun care
Pack for Las Vegas in September around the 37°C / 30°C swing. The governing rule is ventilate and block UV. The one item worth buying before you fly is a breathable mid-layer Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Essential
- Breathable shirts
- Sun hat
- SPF 50+ sunscreen
- Refillable bottle
Smart additions
- Scarf or buff
- Portable charger
- Clear tote for layers
- Lip balm SPF
Leave behind
- Thick parkas
- Wool sweaters
- Snow boots
Top places to visit in Las Vegas in September
Outdoor icons with shade breaks
City centre · Free
Las Vegas landmark walk
Go early on weekdays for quieter photos and softer light.
Add to your planWaterfront · Free
Harbour or river promenade
Golden hour is the calmest window Check the full climate tables below for monthly averages and packing cues.
Add to your planMuseum quarter · Paid
Flagship museum morning
Weekday openings beat weekend queues and wet-day backups.
Add to your planOld town · Free
Historic streets loop
Late morning light helps cold stone feel less harsh.
Add to your planPark · Free
Central green escape
Shade and benches make longer walks realistic Check the full climate tables below for monthly averages and packing cues.
Add to your planCovered market · Free
Indoor food hall backup
Ideal when wet days interrupt outdoor plans Check the full climate tables below for monthly averages and packing cues.
Add to your plan
Top places to stay in September
Base near the sights that matter in September
Best overall
Central core
Walkable to main sights with easier 12.5-hour daylight logistics Check the full climate tables below for monthly averages and packing cues.
Best value
One transit stop out
Lower rates than the core while staying close for high evenings.
Local feel
Neighbourhood streets
Quieter nights and easier restaurant bookings than the busiest tourist blocks.
Top restaurants to visit in September
Breezy rooms and light seasonal plates
Downtown · Classic
Las Vegas lunch counter
Hearty midday stop when outdoor plans run short on daylight.
Add to your planOld town · Cosy
Neighbourhood bistro
Low light and early dinners match short sunset windows Check the full climate tables below for monthly averages and packing cues.
Add to your planMarket · Casual
Covered market stalls
Fast warm food without a reservation on wet afternoons Check the full climate tables below for monthly averages and packing cues.
Add to your planRiverside · Scenic
Waterfront cafe
Daylight seating works best before the evening chill Check the full climate tables below for monthly averages and packing cues.
Add to your planArts district · Modern
Gallery-side kitchen
Pairs well with museum days when weather turns Check the full climate tables below for monthly averages and packing cues.
Add to your planResidential · Local
Corner noodle or soup spot
Simple, hot bowls that suit cold or humid evenings Check the full climate tables below for monthly averages and packing cues.
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Las Vegas weather by month
How September compares. Every month links to its full weather guide.
| Month | Avg high | Wet days | Crowds | Cost | Overall | Best for |
|---|---|---|---|---|---|---|
| January | 17°C (63°F) | 3 | Medium | Mid | Great | Mild days, cool nights |
| February | 19°C (66°F) | 2 | High | High | Great | Comfortable temperatures |
| March | 23°C (73°F) | 2 | High | Peak | Great | Perfect weather |
| April | 28°C (82°F) | 1 | Very High | Peak | Great | Ideal pool weather |
| May | 34°C (93°F) | 1 | Very High | Peak | Okay | Getting very hot |
| June | 41°C (106°F) | 1 | High | High | Avoid | Extreme heat |
| July | 43°C (109°F) | 2 | High | High | Avoid | Hottest month |
| August | 42°C (108°F) | 2 | High | High | Avoid | Still very hot |
| September | 37°C (99°F) | 1 | High | High | Okay | Warm — this guide |
| October | 29°C (84°F) | 2 | High | High | Great | Ideal temperatures |
| November | 21°C (70°F) | 2 | Medium | Mid | Great | Comfortable sightseeing |
| December | 16°C (61°F) | 3 | High | High | Great | Holiday season buzz |
Temperatures shown as Las Vegas monthly averages.
September vs August: September averages 34°C versus 39°C in August — a 5°C cooldown. Crowds shift from High to High while pricing moves into high season. Pick September if you want cooling slightly Check the full climate tables below for monthly averages and packing cues.
September vs October: October trends to 26°C, 8°C cooler than September. Expect high crowds and high season rates. Pick October if you prefer ideal temperatures Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
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Las Vegas in September FAQ
Everything you need to know about Las Vegas weather in September
Daytime highs average 37°C (99°F) and nights fall near 30°C (86°F). The monthly mean sits around 34°C. Expect a 1° swing from early to late September Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
How we work this out
Temperature and rainfall figures are 30-year meteorological averages. Crowd levels come from national tourism arrival data. Price bands reflect mid-range accommodation and economy flights from major long-haul cities, sampled quarterly.
Last updated September 10, 2026 · Written by the Holicay travel team