Las Vegas, NV weather in September
Expect hot, dry weather in Las Vegas in September, with highs near 95°F and lows near 72°F. Rain falls on about 2 days. Plan outdoor time for mornings and evenings.
- Normal high
- 95°F
- Normal low
- 72°F
- Wet days
- 2
- 0.3 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 100°F | 89°F |
| Normal low | 78°F | 66°F |
| Chance of a wet day | 7% | 5% |
| Sunrise / sunset | 6:12 am / 7:08 pm | 6:34 am / 6:26 pm |
| Daylight | 12.9 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical September day
- 6 am73°Fdew point 39°F
- 9 am83°Fdew point 39°F
- Noon91°Fdew point 39°F
- 3 pm93°Fdew point 38°F
- 6 pm90°Fdew point 37°F
- 9 pm83°Fdew point 37°F
NOAA hourly normals (local standard time) from Las Vegas Mccarran Airport (7 mi away); average wind 8 mph; clear or few clouds in 68% of daytime hours, mostly cloudy or overcast in 13%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F1 of 30
- Hot dayshigh 90°F or more24 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow2 of 30
- Notable rainat least 0.10 in1 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 0.3 in; a dry September brings about 0.0 in and a wet one about 0.4 in (25th and 75th percentiles). Days with half an inch or more are rare.
How September varies from year to year
- Warmest September, 1991-20202018: average high 100°F
- Coolest September1998: average high 91°F
- Wettest September1997: 2.1 in
- Driest September1992: no measurable precipitation
- Highest reading114°F (September 6, 2020)
- Lowest reading54°F (September 24, 2017)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 103°F | 95°F | 81°F |
| Normal low | 81°F | 72°F | 60°F |
| Wet days | 2 | 2 | 2 |
| Comfortable days | 0 | 1 | 12 |
| Daylight | 13.5 h | 12.4 h | 11.3 h |
Highs change by -8°F from August and -14°F into October.
Nearby alternatives in September
- Warmer: Furnace Creek, CA98 mi · high 108°F · 1 wet day
- Cooler: Grand Canyon Village, AZ166 mi · high 77°F · 6 wet days
How Las Vegas ranks in September
- Normal high12th warmest of 378 cities; 1st of 3 in Nevada
- Wet days58th driest of 378
- Comfortable days282nd most of 342
What to pack for Las Vegas in September
- Light, breathable clothing – highs near 95°F
Heating and cooling
September has 0 heating degree days and 560 cooling degree days (base 65°F), 10% of the year's total heating and cooling demand.
Questions
How hot is Las Vegas in September?
The normal high is 95°F and the normal low is 72°F. From 1991 to 2020 the hottest September reading was 114°F (September 6, 2020).
Does it rain a lot in Las Vegas in September?
About 2 days in September have at least 0.01 in of precipitation, and the normal total is 0.3 in. The wettest September in 1991-2020 was in 1997 (2.1 in); the driest was in 1992, with no measurable precipitation.
Is September a good time to visit Las Vegas?
September ranks 11th of 12 months on our comfort score for Las Vegas (38 out of 100). It has about 1 comfortable day and about 24 days at 90°F or hotter. The best month is March.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: Las Vegas Mccarran Airport (USW00023169), 7.3 mi SSW of the city center, 2,131 ft (135 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Mccarran International Airport (723860-23169), 7.3 mi SSW of the city center, 2,175 ft (179 ft higher than the city). Hourly observations, 1991-2020.