Will I be hot?
Will I be hot in Las Vegas in September?
Verdict
Yes — Yes, hot.
Highs push 95°F — sun exposure and hydration matter more than layering.
Day vs. night
Day
95°F
Sweltering
Plan indoor hours around the peak of the day.
Night
71°F
Comfortable
Comfortable outside without an extra layer.
Why
Las Vegas in September averages highs of 95°F, lows of 71°F, 2 rainy days.
Prioritize breathable fabrics, sun protection, and hydration over any kind of layering piece.