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September Weather in Las Vegas, United States

Last updated: June 24, 2025

In September, the average temperature in Las Vegas, United States hovers around 18°C (64°F), providing a pleasant climate. Temperatures can range from a chilly 0°C (32°F) to a warm 33°C (92°F), catering to a variety of preferences. Expect approximately 39 mm (1.6 in) of precipitation over 5 days, with the humidity averaging a comfortable 72%. It's a month where nature thrives!

September Temperature in Las Vegas

In September in Las Vegas, the average temperature is 18°C (64°F). Maximum temperatures can reach 33°C (92°F), while the minimum can drop as low as 0°C (32°F). Be prepared for a range of temperatures while enjoying your trip!

September Weather in Las Vegas: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Las Vegas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Las Vegas, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (92°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec323543505968716864514335
Data source: Temperature data for Las Vegas generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Las Vegas

In Las Vegas in September, the precipitation amount is 39 mm (1.6 in) over a period of 5 days.

September Precipitation Trends in Las Vegas

The chart displays monthly precipitation patterns in Las Vegas, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Las Vegas, September typically receives around 39 mm (1.6 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec262033354141648039551918
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Las Vegas

In Las Vegas in September, humidity is 72%. With an average temperature of 18°C (64°F), this humidity feels like a warm, sticky embrace, making travel somewhat uncomfortable as the air clings to your skin, leaving you longing for a refreshing breeze.

September Average Humidity in Las Vegas

This chart illustrates the average monthly humidity levels in Las Vegas, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Las Vegas is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%79%66%60%57%55%57%65%72%78%81%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Las Vegas

In Las Vegas in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Las Vegas.

Maximum UV Index Levels in Las Vegas for September

The chart shows the monthly maximum UV Index (UVI) for Las Vegas in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Las Vegas typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111213131211854
Data source: Las Vegas September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Las Vegas Compares to Other Months

Weather in Las Vegas varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Las Vegas, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Las Vegas, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)26 mm (1.0 inches)78%moderate
February Weather1°C (35°F)20 mm (0.8 inches)79%high
March Weather6°C (43°F)33 mm (1.3 inches)66%very high
April Weather10°C (50°F)35 mm (1.4 inches)60%extreme
May Weather15°C (59°F)41 mm (1.6 inches)57%extreme
June Weather20°C (69°F)41 mm (1.6 inches)55%extreme
July Weather21°C (71°F)64 mm (2.5 inches)56%extreme
August Weather20°C (69°F)80 mm (3.1 inches)65%extreme
September Weather18°C (64°F)39 mm (1.6 inches)72%extreme
October Weather11°C (51°F)55 mm (2.2 inches)78%very high
November Weather6°C (43°F)19 mm (0.8 inches)81%moderate
December Weather2°C (35°F)18 mm (0.7 inches)79%moderate

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