Las Vegas weather in September 2025

Expect 35°C daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Las Vegas in September. Check more long-term weather averages for Las Vegas in September before you book your next holiday to Nevada in 2025/2026.

  • 35°C maximum daytime temperature in September in Las Vegas35
    35°C max day temperature
  • 11 hours of sunshine per day
  • 2 days with some rainfall in September in Las Vegas2
    2 days with some rainfall
  • 19°C minimum night-time temperature in September in Las Vegas19
    19°C min night temperature
  • 12 hours of daylight per day in September in Las Vegas12
    12 hours of daylight per day
  • High heat & humidity in September in Las VegasH
    High heat & humidity
  • 9 mm monthly rainfall in September in Las Vegas9
    9 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Las Vegas8
    8 (Very High) UV index

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The September weather guide for Nevada (Las Vegas) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Las Vegas

How hot is it in Las Vegas in September?

Daytime temperatures usually reach 35°C in Las Vegas in September with high heat and humidity, falling to 19°C at night.

How sunny is it in Las Vegas in September?

There are normally 11 hours of bright sunshine each day in Las Vegas in September - that's 90% of daylight hours.

Does it ever rain in Las Vegas in September?

There are usually 2 days with some rain in Las Vegas in September and the average monthly rainfall is 9mm.

Las Vegas September sunrise & sunset times

Browse the sunrise and sunset times for Las Vegas in September 2025. Select a month to view Las Vegas sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:13 18:08
Monday, 15th September 2025 05:23 17:47
Tuesday, 30th September 2025 05:35 17:25

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