Monthly climate guide
Las Vegas weather in September
Expect very hot weather in Las Vegas in September: afternoons reach about 35°C (96°F), while nights drop to around 21°C (69°F). Around 10 mm of rain falls over the month (very dry), and skies are mostly sunny. Daytime highs are 4°C cooler than August and 7°C warmer than October.
What stands out in September
- In Las Vegas, September is early autumn.
- Just 290 km apart, but Las Vegas runs about 2°C warmer than Palm Springs this month.
- It cools down fast from here: October is about 7°C cooler.
- Expect a big gap between day and night — about 14°C.
Avg high
35°C
96°F
Avg low
21°C
69°F
Rainfall
10 mm
very dry
Humidity
26%
relative
Sky
24%
cloud · mostly sunny
Las Vegas weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 15°C / 59°F | 3°C / 37°F | 17 mm | 46% | 45% |
| February | 18°C / 64°F | 4°C / 39°F | 15 mm | 41% | 39% |
| March | 22°C / 72°F | 8°C / 46°F | 13 mm | 36% | 46% |
| April | 27°C / 80°F | 11°C / 52°F | 9 mm | 28% | 38% |
| May | 31°C / 88°F | 15°C / 59°F | 6 mm | 24% | 35% |
| June | 39°C / 102°F | 22°C / 71°F | 1 mm | 14% | 23% |
| July | 40°C / 105°F | 25°C / 78°F | 17 mm | 23% | 36% |
| August | 40°C / 103°F | 25°C / 77°F | 18 mm | 24% | 31% |
| September | 35°C / 96°F | 21°C / 69°F | 10 mm | 26% | 24% |
| October | 28°C / 83°F | 14°C / 57°F | 10 mm | 27% | 26% |
| November | 21°C / 69°F | 7°C / 45°F | 12 mm | 33% | 34% |
| December | 14°C / 58°F | 2°C / 36°F | 13 mm | 43% | 44% |
What to pack for September
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- An extra layer — evenings are noticeably cooler than afternoons
- Sunglasses
Is September a good time to visit Las Vegas?
Compare the months in the chart above to find your ideal window.
Best time to visit Las Vegas →Other United States cities in September
Cite or embed this data
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Las Vegas weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/las-vegas/september
<a href="https://weathercompare.eu/weather/usa/las-vegas/september">Las Vegas weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/las-vegas" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Las Vegas weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/las-vegas/september">Las Vegas weather in September</a> – WeatherCompare</p>
Las Vegas in September: quick answers
Is September a good time to visit Las Vegas?
It can be, if you like heat: September highs in Las Vegas are around 35°C. Good for the beach; plan sightseeing for early morning and evening.
How warm is Las Vegas in September?
Average highs are about 35°C (96°F) and average lows about 21°C (69°F), based on 10 years of daily data.
Does it rain a lot in Las Vegas in September?
Las Vegas typically gets around 10 mm of rain in September — very dry.
Figures are long-term averages for the area around Las Vegas (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.