Las Vegas weather in September: Las Vegas, Nevada: normal highs, lows, rain and records for September
Las Vegas in September has a normal high of 95°F and a normal low of 72°F, a daily mean of 84°F, falling from 100°F on the 1st to 89°F by the 30th. Measurable precipitation falls on 2 days in a normal September, 0.32 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 35°C and low of 22°C, 8 mm of precipitation in September.
- NOAA stationHarry Reid International Airport
- Station IDUSW00023169
- Location36.07°N 115.16°W
- Elevation2,131 ft (650 m)
- From the center12 miles
- Population678,922
- Jan 59° 41°
- Feb 63° 44°
- Mar 71° 51°
- Apr 79° 57°
- May 89° 66°
- Jun 99° 76°
- Jul 105° 82°
- Aug 103° 81°
- Sep 95° 72°
- Oct 81° 60°
- Nov 67° 47°
- Dec 57° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Las Vegas in September?
The normal high is 95°F and the normal low 72°F, for a daily mean of 83.6°F. September is 8.1°F cooler than August and 13.2°F warmer than October. September is the 4th warmest month of the year in Las Vegas and the 6th wettest. Across the month the normal high falls 11°F, from 100°F on September 1 to 89°F on September 30. From one year to the next September's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 82°F and 86°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 7%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 100°F | 78°F | 7% | 3% |
| September 8 | 98°F | 75°F | 7% | 3% |
| September 15 | 95°F | 73°F | 6% | 2% |
| September 22 | 92°F | 70°F | 5% | 2% |
| September 30 | 89°F | 66°F | 5% | 2% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 100°F | 78°F | 7% | 3% | 13 h |
| September 2 | 100°F | 77°F | 7% | 3% | 13 h |
| September 3 | 100°F | 77°F | 7% | 3% | 12 h 50 min |
| September 4 | 99°F | 77°F | 7% | 3% | 12 h 50 min |
| September 5 | 99°F | 76°F | 7% | 3% | 12 h 50 min |
| September 6 | 99°F | 76°F | 7% | 2% | 12 h 50 min |
| September 7 | 98°F | 76°F | 7% | 3% | 12 h 50 min |
| September 8 | 98°F | 75°F | 7% | 3% | 12 h 40 min |
| September 9 | 98°F | 75°F | 7% | 3% | 12 h 40 min |
| September 10 | 97°F | 75°F | 6% | 3% | 12 h 40 min |
| September 11 | 97°F | 74°F | 6% | 2% | 12 h 40 min |
| September 12 | 97°F | 74°F | 6% | 2% | 12 h 30 min |
| September 13 | 96°F | 74°F | 6% | 2% | 12 h 30 min |
| September 14 | 96°F | 73°F | 6% | 2% | 12 h 30 min |
| September 15 | 95°F | 73°F | 6% | 2% | 12 h 30 min |
| September 16 | 95°F | 72°F | 6% | 2% | 12 h 30 min |
| September 17 | 95°F | 72°F | 6% | 2% | 12 h 20 min |
| September 18 | 94°F | 72°F | 6% | 2% | 12 h 20 min |
| September 19 | 94°F | 71°F | 6% | 2% | 12 h 20 min |
| September 20 | 93°F | 71°F | 5% | 2% | 12 h 20 min |
| September 21 | 93°F | 70°F | 5% | 2% | 12 h 10 min |
| September 22 | 92°F | 70°F | 5% | 2% | 12 h 10 min |
| September 23 | 92°F | 70°F | 5% | 2% | 12 h 10 min |
| September 24 | 92°F | 69°F | 5% | 2% | 12 h 10 min |
| September 25 | 91°F | 69°F | 5% | 2% | 12 h 10 min |
| September 26 | 91°F | 68°F | 5% | 2% | 12 h |
| September 27 | 90°F | 68°F | 5% | 2% | 12 h |
| September 28 | 90°F | 67°F | 5% | 2% | 12 h |
| September 29 | 89°F | 67°F | 5% | 2% | 12 h |
| September 30 | 89°F | 66°F | 5% | 2% | 11 h 50 min |
- Normal high
- 95°FSeptember average
- Normal low
- 72°FSeptember average
- Precipitation
- 0.32 inmonth total
- Days with precipitation
- 20.01 inch or more
- Days at 90°F or more
- 24
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 29
- Sunshine
- 94%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023169; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Las Vegas in September?
On a given September day the chance of 0.01 inch or more is 6% on average, highest around September 1 (7%). In all, 0.32 in falls on 2 days of a normal September.
In a normal September in Las Vegas, 24 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023169.
How humid and windy is Las Vegas in September?
At 3 p.m. the normal temperature is 88°F with 14% relative humidity and a dew point of 33°F; at 6 a.m. it is 67°F with 29% humidity. The wind averages 7.2 mph, most often from the south in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 67°F | 34°F | 29% | 6.6 mph | 76% |
| 9 a.m. | 78°F | 35°F | 21% | 6.0 mph | 75% |
| noon | 85°F | 34°F | 16% | 7.7 mph | 71% |
| 3 p.m. | 88°F | 33°F | 14% | 8.4 mph | 67% |
| 6 p.m. | 84°F | 33°F | 16% | 7.3 mph | 75% |
| 9 p.m. | 77°F | 33°F | 20% | 7.9 mph | 79% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023169. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Las Vegas?
The warmest September temperature on Las Vegas's official record (since 1937) is 114°F, on September 6, 2020; the coldest is 43°F, on September 27, 1948. The wettest September brought 3.39 in (1939).
The September mean against the 1991-2020 normal of 83.6°F: 2021 86.0°F (+2.5), 2022 86.4°F (+2.8), 2023 81.3°F (−2.3), 2024 86.2°F (+2.6), 2025 83.5°F (−0.1), 2026 85.3°F (+1.7). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 86.0°F | +2.5°F | 0.12 in |
| 2022 | 86.4°F | +2.8°F | 0.48 in |
| 2023 | 81.3°F | −2.3°F | 1.51 in |
| 2024 | 86.2°F | +2.6°F | 0.00 in |
| 2025 | 83.5°F | −0.1°F | 0.28 in |
| 2026 | 85.3°F | +1.7°F | 0.30 in |
Source: records: ACIS, NWS threaded record LASthr; recent months: ACIS, station USW00023169. Records and recent months use complete months only.
How does September in Las Vegas compare across Nevada?
Across the 55 places PlainClimate covers in Nevada, September normal highs run from 71°F in Incline Village to 102°F in Laughlin; Las Vegas's is 95°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.