Las Vegas weather in September
September in Las Vegas: hot, dry, with clean air — a great time to visit.
#8 of 12 months in Las Vegas · #388 of 604 destinations to visit in September · comfort 74/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Las Vegas climate normals — September
| Daytime high | 35°C / 95°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 71°F | |
| Feels like (high) | 33°C / 91°F | |
| Rainfall | 15 mm / 0.6 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 34% | 🌵 dry |
| Dew point | 8°C / 46°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 12.4 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 44 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Las Vegas in September — FAQ
- Is September a good time to visit Las Vegas?
- September in Las Vegas: hot, dry, with clean air — a great time to visit. It ranks #8 of 12 months for Las Vegas on SeasonMap's comfort score (74/100).
- What is the weather like in Las Vegas in September?
- In September, Las Vegas averages a daily high of 35°C and a low of 21.4°C, with about 14.7 mm of rain over roughly 1.2 rainy days.
- What is the air quality in Las Vegas in September?
- Las Vegas has a mean US Air Quality Index of about 44 in September.