Las Vegas · September
Run in the morning.
Average high is 95°F with a 72°F overnight low. Dry air (24% humidity) makes the heat more bearable than the numbers suggest. Dry month — only 2 measurable rain days on average. Dry heat climbs fast after sunrise — get out in the cooler morning hours.
Avg high / low
95° / 72°F
Humidity
24%
Rain days
2/mo
Wind
12 mph
What September feels like in Las Vegas
Sunrise
06:23
Mid-month average
Sunset
18:47
Mid-month average
Time-of-day breakdown
Morning
Cool relative to the day's peak, but heat builds fast. By 10 AM you're already chasing comfort.
Midday
Heat peaks here. Skip unless you've got shade and pace tolerance.
Evening
Cools off after sunset but still warm. Good for easy efforts; avoid hard intervals if you're chasing pace.
What to wear running in Las Vegas in September
The kit for September in Las Vegas: light, breathable, and moisture-wicking — singlet or short-sleeve only.
September vs the surrounding months
vs August
-7° avg high
-2 rain days
Las Vegas in August →
September
95°F avg high
2 rain days
Best: morning
vs October
+13° avg high
0 rain days
Las Vegas in October →
Frequently Asked Questions
What is the best time of day to run in Las Vegas in September?+
Morning. Dry heat climbs fast after sunrise — get out in the cooler morning hours.
What's the average temperature in Las Vegas in September?+
Average high 95°F, average low 72°F.
How does September compare to surrounding months in Las Vegas?+
Compared to August (avg high 102°F), September is cooler. Compared to October (avg high 82°F), September is warmer.
Does it rain often in Las Vegas in September?+
Expect about 2 measurable rain days in September, on average.