Very hot in Sep
38°C average high
avg high · 26° at night
25°C+ on almost every day · often 35°C+
Nevada, USA
Las Vegas weather in September
Is it warm? Yes. September in Las Vegas is very hot: afternoons average 36°C and nights 23°C. Most days (80%) peak between 31°C and 40°C.
Very hot · average high
36°C
25°C or more on almost every day. 35°C or more on about six in ten days.
- Average low23°overnight
- Sea—inland
- Rainy days17 mm in the month
- SkyMostly clear18% cloud · 78% clear days
How warm it really gets
Every September afternoon from 2011–2025: 450 days. Most (80%) peaked between 31° and 40°.
September, year by year
The average September high in each year. The warmest, 2020, averaged 38°C; the coolest, 2013, 33°C.
Compared with home
Average September highs. Rain is rare: less than one wet day in a typical month.
- Las Vegas36°
- London21°
- Manchester18°
- Dublin18°
- Cork18°
- Belfast17°
- Glasgow17°
Warmer in September, not much further
Flying times are estimates from Dublin; Las Vegas is about 10h 15m.
Very hot in Sep
37°C average high
avg high · 28° at night
25°C+ on almost every day · often 35°C+
Very hot in Sep
40°C average high
avg high · 24° at night
25°C+ on almost every day · often 35°C+
Air: Copernicus ERA5-Land, 2011–2025, matched to the official averages for Las Vegas airport. Rainy days = days with 1 mm of rain or more, as weather stations count them. Clear day = average cloud cover of 30% or less. These are averages of past weather, not a forecast. Methodology