September weather forecast and climate
Las Vegas, NV

A night aerial view of the Las Vegas strip in Nevada, USA
A night aerial view of the Las Vegas strip in Nevada, USA
September gradually transitions to the more comfortable fall weather, with average high temperatures dropping to approximately 90°F (32.2°C). Rain is limited to a couple of days, while the humidity is up to 25%.
Autumn is one of the better times to visit Las Vegas, and September is no exception with a fall in tourist numbers. Hosts of festivals, including the Las Vegas Greek Food Festival, attract tourists and locals equally in the mild weather, as there is no shortage of delicious food and drink.
Average temperature in September - Las Vegas, NV
  • Average high temperature in September: 94°F

The warmest month (with the highest average high temperature) is July (104.2°F).
The month with the lowest average high temperature is December (56.6°F).

  • Average low temperature in September: 71.1°F

The month with the highest average low temperature is July (80.9°F).
The coldest month (with the lowest average low temperature) is December (38.7°F).

Average humidity in September - Las Vegas, NV
  • Average humidity in September: 25%

The month with the highest relative humidity is January (45.1%).
The month with the lowest relative humidity is June (16.5%).

Average rainfall in September - Las Vegas, NV
  • Average rainfall in September: 0.3"

The wettest month (with the highest rainfall) is February (0.8").
Driest months (with the lowest rainfall) are May and June (0.1").

Average rainfall days in September - Las Vegas, NV
  • Average rainfall days in September: 1.6 days

The month with the highest number of rainy days is February (4 days).
The month with the lowest number of rainy days is June (0.6 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 shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 11.2h

The month with most sunshine is June (Average sunshine: 13.4h).
The month with least sunshine is December (Average sunshine: 7.6h).

Average UV index in September - Las Vegas, NV
  • Average UV index in September: 8

The month with the highest UV index is July (UV index 11).
The month with the lowest UV index is December (UV index 2).

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