Las Vegas
Nevada, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Las Vegas, NV

September, the first month of the autumn, in Las Vegas, is still a hot month, with temperature in the range of an average low of 70.2°F (21.2°C) and an average high of 87.4°F (30.8°C).

Temperature

In Las Vegas, the average high-temperature slightly decreases, from a torrid 95.9°F (35.5°C) in August, to a tropical 87.4°F (30.8°C). The average low-temperature, in September, is 70.2°F (21.2°C).

Humidity

The average relative humidity in Las Vegas is 24%.

Rainfall

In Las Vegas, during September, the rain falls for 5.3 days and regularly aggregates up to 0.51" (13mm) of precipitation. Throughout the year, in Las Vegas, there are 57.5 rainfall days, and 6.02" (153mm) of precipitation is accumulated.

Snowfall

March through November are months without snowfall in Las Vegas.

Daylight

The average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine is 10.3h.

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Las Vegas?

In Las Vegas, in September, the average high-temperature is 87.4°F (30.8°C), and the average low-temperature is 70.2°F (21.2°C).

What is the average humidity in September in Las Vegas?

The average relative humidity in September is 24%.

How many days does it rain in September in Las Vegas?

In Las Vegas, Nevada, during September, the rain falls for 5.3 days and regularly aggregates up to 0.51" (13mm) of precipitation.

When it does not snow in Las Vegas?

In Las Vegas snow does not fall in March through November.

What is the average length of the day in September in Las Vegas?

In September, the average length of the day in Las Vegas is 12.4h.

How many hours of sunshine does Las Vegas have in September?

In September, the average sunshine in Las Vegas is 10.3h.

How high is the UV index in September in Las Vegas?

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to the UV radiation.
Average temperature in September - Las Vegas, NV
  • Average high temperature in September: 87.4°F

The warmest month (with the highest average high temperature) is July (97.3°F).
The month with the lowest average high temperature is December (50°F).

  • Average low temperature in September: 70.2°F

The month with the highest average low temperature is July (77.7°F).
The coldest month (with the lowest average low temperature) is December (37.9°F).

Average humidity in September - Las Vegas, NV
  • Average humidity in September: 24%

The month with the highest relative humidity is January (48%).
The month with the lowest relative humidity is June (15%).

Average rainfall in September - Las Vegas, NV
  • Average rainfall in September: 0.51"

The wettest month (with the highest rainfall) is July (0.87").
The driest month (with the least rainfall) is June (0.08").

Average rainfall days in September - Las Vegas, NV
  • Average rainfall days in September: 5.3 days

The month with the highest number of rainy days is July (8.3 days).
The month with the least rainy days is June (1.4 days).

Average snowfall in September - Las Vegas, NV
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.16").
Months with the least snowfall are March, April, May, June, July, August, September, October and November (0").

Average snowfall days in September - Las Vegas, NV
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.3 days).
Months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

Average daylight in September / Average sunshine in September - Las Vegas, NV
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 10.3h

The month with the most sunshine is August (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 7.1h).

Average UV index in September - Las Vegas, NV
  • Average UV index in September: 6

Months with the highest UV index are June and July (UV index 8).
The month with the lowest UV index is December (UV index 2).