Las Vegas Weather in September
United States · Hot Desert climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Las Vegas sees average temperatures ranging from a low of 22.7°C (72.9°F) to a high of 36.2°C (97.2°F), with a mean of 29.6°C (85.3°F). Compared to the annual average of 21.5°C (70.7°F), this month is 8.1°C warmer than the yearly norm. Precipitation averages 12.6mm, making it approximately 4.0mm wetter than the monthly average of 9.0mm. The city receives an average of 11.5 hours of sunshine per day during September, with relative humidity averaging 21.6%. Wind speeds reach an average maximum of 19.7 km/h. For travelers, this month offers a temperature experience in Las Vegas, with wetter-than-average conditions compared to the rest of the year.
Las Vegas tricks you with air conditioning. I stepped off the plane in July at 42°C and the terminal was 18°C — the shock is real. Pack layers for the casinos, sunscreen for outside, and accept you'll move between climate zones every 30 minutes. June-August is genuinely dangerous outside; plan pool mornings, indoor afternoons. The sweet spots are March-April and October-November: 22-26°C, perfect for hiking Red Rock. Skip December-February unless you love 12°C days and 4°C nights. Always carry water — desert dehydration sneaks up. And lip balm. Always lip balm.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 33.5°C (92.3°F) | 29.6°C (85.3°F) | 22.6°C (72.7°F) |
| Rainfall | 20.4mm | 12.6mm | 3.4mm |
| Sunshine | 12.4 hrs | 11.5 hrs | 10.7 hrs |
| Humidity | 24.2% | 21.6% | 22.3% |
| Wind | 22.7 km/h | 19.7 km/h | 18.1 km/h |
| Rainy Days | 5.2 | 1.6 | 2.0 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Las Vegas in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Las Vegas in September?
The average temperature in Las Vegas during September ranges from 22.7°C (72.9°F) to 36.2°C (97.2°F), with a mean of 29.6°C (85.3°F).
How much does it rain in Las Vegas in September?
Las Vegas receives an average of 12.6mm of precipitation in September, spread across approximately 1.6 rainy days.
What should I pack for Las Vegas in September?
Based on September weather data, pack lightweight, breathable clothing, sunscreen, and a hat.
Is September a good time to visit Las Vegas?
September is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Las Vegas
Cities with Similar September Climate (Hot Desert)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 36.17°, -115.14°. Timezone: America/Los_Angeles. Last updated: 2026-07-30.