How warm is it in Las Vegas in September?

Daytime highs averaged 36.1 °C, night-time lows 21.4 °C. The highest value of the past 10 years was 45.5 °C (6 Sep 2020), the lowest 9.4 °C (30 Sep 2019).

How often does it rain in Las Vegas in September?

On average there were 2.4 rain days (at least 1 mm) with 11.0 mm of precipitation in total. In 3 of 10 years there was no rain day at all.

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Las Vegas weather in September: temperature & rain

Photo: Dietmar Rabich · CC BY-SA 4.0

🇺🇸 Weather in Las Vegas in September

This is what the weather in Las Vegas (Nevada, USA) was like in September over the years 2017–2026.

Key facts at a glance

Prevailing weather: Sunny

Avg. daytime high

36.1 °C

33.2 °C – 37.8 °C

Avg. night-time low

21.4 °C

19.7 °C – 23.0 °C

Avg. rain days in period

2.4

8 % of days · ≥ 1.0 mm

Avg. precipitation in period

11.0 mm

0.0 mm – 27.8 mm

Avg. cloud cover

27 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

–

No sea nearby – no sea temperature.

Extremes: Highest temperature 45.5 °C (6 Sep 2020) · Lowest temperature 9.4 °C (30 Sep 2019) · Avg. daily peak wind 20 km/h

Weather mix of all days

178Sunny
63Partly cloudy
8Cloudy
18Light rain
6Rain

Summary

On average 36.1 °C during the day and 21.4 °C at night.
On average 2.4 rain days (Rain day = at least 1.0 mm of precipitation) with 11.0 mm of precipitation in total.
In 3 of 10 years there was not a single rain day.
Prevailing weather: Sunny.
Warmest year: 2024 (avg. 37.8 °C), coolest: 2017 (avg. 33.2 °C).
Wettest year: 2023 (27.8 mm), driest: 2020 (0.0 mm).
Extremes: 45.5 °C on 6 Sep 2020 and 9.4 °C on 30 Sep 2019.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max36.0°Avg. min21.5°
Rain days
3 Rain days
Precipitation
11.5 mm
Avg. cloud cover
–
Sea temperature
–
Max 42.3 °C · Min 16.2 °C
2025
Avg. max34.9°Avg. min21.4°
Rain days
7 Rain days
Precipitation
26.3 mm
Avg. cloud cover
39 % cloudy
Sea temperature
–
Max 41.5 °C · Min 17.3 °C
2024
Avg. max37.8°Avg. min22.5°
Rain days
0 Rain days
Precipitation
1.6 mm
Avg. cloud cover
27 % cloudy
Sea temperature
–
Max 42.2 °C · Min 13.6 °C
2023
Avg. max34.2°Avg. min19.9°
Rain days
5 Rain days
Precipitation
27.8 mm
Avg. cloud cover
34 % cloudy
Sea temperature
–
Max 39.7 °C · Min 14.5 °C
2022
Avg. max37.1°Avg. min23.0°
Rain days
4 Rain days
Precipitation
20.3 mm
Avg. cloud cover
34 % cloudy
Sea temperature
–
Max 44.7 °C · Min 17.5 °C
2021
Avg. max37.2°Avg. min22.4°
Rain days
1 Rain days
Precipitation
2.8 mm
Avg. cloud cover
26 % cloudy
Sea temperature
–
Max 42.8 °C · Min 13.4 °C
2020
Avg. max37.6°Avg. min21.7°
Rain days
0 Rain days
Precipitation
0.0 mm
Avg. cloud cover
23 % cloudy
Sea temperature
–
Max 45.5 °C · Min 14.2 °C
2019
Avg. max35.0°Avg. min20.0°
Rain days
0 Rain days
Precipitation
1.9 mm
Avg. cloud cover
23 % cloudy
Sea temperature
–
Max 42.8 °C · Min 9.4 °C
2018
Avg. max37.7°Avg. min22.0°
Rain days
1 Rain days
Precipitation
1.7 mm
Avg. cloud cover
13 % cloudy
Sea temperature
–
Max 42.1 °C · Min 18.2 °C
2017
Avg. max33.2°Avg. min19.7°
Rain days
3 Rain days
Precipitation
16.4 mm
Avg. cloud cover
28 % cloudy
Sea temperature
–
Max 41.6 °C · Min 9.8 °C

Frequently asked questions

How warm is it in Las Vegas in September?: Daytime highs averaged 36.1 °C, night-time lows 21.4 °C. The highest value of the past 10 years was 45.5 °C (6 Sep 2020), the lowest 9.4 °C (30 Sep 2019).
How often does it rain in Las Vegas in September?: On average there were 2.4 rain days (at least 1 mm) with 11.0 mm of precipitation in total. In 3 of 10 years there was no rain day at all.

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Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)