Las Vegas Weather in September

In September, Las Vegas, Nevada sees the last of summer's 100-degree Fahrenheit temperatures (over 37 °C).

This page gives detailed information on the typical September weather for Las Vegas.

You can jump directly to data and descriptions for:

The numbers here are historical averages based on climate data gathered at the McCarran International Airport, located near the south end of the Las Vegas Strip.

Temperature Weather iconTemperature

94 °F September average high 34 °C
71 °F September average low 22 °C

In most years, Las Vegas averages a daily maximum temperature for September that's between 91 and 97 degrees Fahrenheit (33 to 36 degrees Celsius). The minimum temperature usually falls between 69 and 74 °F (20 to 23 °C).

The days at Las Vegas begin to cool down quickly during September. By the end of the month, the temperature has dropped around 11 °F (6 °C) below what it was at the start.

22 days 90 °F max. or more (32 °C)
13 days 70 °F min. or less (21 °C)

Nearly every day in September heats up to over 80 °F (26 °C) in Las Vegas. The city averages 6 days this month when the thermometer reaches into the 100s °F (over 37 °C).

At night, the thermometer dips to 60 °F (16 °C) or below on 2 days. Only about once a decade does September get as cold as 50 °F (10 °C).

Rainy Weather iconRain

0.3 in total precipitation 6 mm
2 days of rain

Most years, Las Vegas gets less than 0.4 inches (9 mm) of rain in September. About once every four years, the city receives no rain at all this month.

Sunny Weather iconSun

91 % sunshine
22 days clear skies

The sun's rays reach the ground in Las Vegas during 91 percent of daylight hours on average in September, for a total of 338 hours in the month. Typically on 22 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in September at Las Vegas lasts for 12 hours and 22 minutes a day on average. The longest day of the month is the 1st with 12 hours and 55 minutes of daylight. By the end of the month, the days have shortened to 11:50 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

25 % September average humidity

The relative humidity in Las Vegas during September usually peaks at 34 percent in the morning then drops to 17 percent around mid afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 30 34 32 23 18 17 21 26

Windy Weather iconWind

8.9 mph September wind speed average 14.3 kph

September is a little less windy than most other months in Las Vegas.

Stormy Weather iconStorms

1 day rainfall of 0.1 inches (2.5 mm) or more
2 days with thunderstorms in September

About once every five years, Las Vegas receives as much as an inch (25 mm) of rain in one day during September.


These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.

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