What September feels like in Las Vegas
In Las Vegas, September brings early autumn. Midday heat is intense, and most people keep to shade or air-conditioning in the afternoon. The day–night swing is wide (about 12.7°C (22.9°F)): nights stay warm, so mornings and evenings feel very different from midday. Dry air means sweat evaporates quickly — it feels less sticky, but you lose water fast.
Rain in Las Vegas in September
Rain is rare in September — most weeks pass without a wet day. Rain tends to come in heavy bursts: about 9.2 mm (0.4 in) on an average rainy day. That is heavier than Las Vegas's usual 5.7 mm per rainy day across the year.
Daylight and sunshine in September
On 15 September the sun rises at about 6:22 am and sets around 6:50 pm local time, giving 12 h 28 min of daylight. Days are getting shorter: 1 h 7 min less daylight than in mid-August. About 94% of daylight hours are sunny; in short, skies are mostly clear.
How September compares to the rest of the year
Ranked by average high, September comes out as the 4th warmest month in Las Vegas. Compared with August, afternoons are 4.1°C (7.4°F) cooler, with 5 mm less rain. Temperatures keep falling into October. The next month's average high: 26.8°C (80.2°F).
Who September suits
- Sightseeing: less ideal — midday heat makes long walks hard.
- Parks & outdoor: less ideal — afternoons are too warm to linger outside.
- Museums & indoor: a good choice — a cool break during the hottest hours.
Tips for visiting Las Vegas in September
Versatile Layers
Days are noticeably warmer than nights — layers you can add or remove.
Sun Protection
Loose, breathable clothing plus sunscreen and a wide-brimmed hat.
Quick questions
How warm is Las Vegas in September?
It feels very hot: typical highs are 34.4°C (93.9°F), with lows near 21.7°C (71.1°F).
Does it rain a lot in Las Vegas in September?
Hardly — only about 1 rainy days and 9 mm for the whole month.
What should I wear in Las Vegas in September?
Pack versatile layers and sun protection. Evenings feel similar to the day, so the same clothes work from morning to night.
Is September or October better for visiting Las Vegas?
October, clearly: it ranks #3 of 12 among Las Vegas's months, against #9 for the other. October is cooler and has more rainy days.