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September Weather at McCarran International Airport Nevada, United States

Daily high temperatures decrease by 10°F, from 99°F to 89°F, rarely falling below 79°F or exceeding 105°F.

Daily low temperatures decrease by 11°F, from 76°F to 66°F, rarely falling below 57°F or exceeding 83°F.

For reference, on July 13, the hottest day of the year, temperatures at McCarran International Airport typically range from 81°F to 104°F, while on December 26, the coldest day of the year, they range from 39°F to 56°F.

Average High and Low Temperature in September at McCarran International Airport

Average High and Low Temperature in September at McCarran International AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303040°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°F110°F110°FAugOctSep 199°FSep 199°F76°F76°FSep 3089°FSep 3089°F66°F66°FSep 1196°FSep 1196°F73°F73°FSep 2192°FSep 2192°F69°F69°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in September at McCarran International Airport

Average Hourly Temperature in September at McCarran International AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAugOctcoolcoolcomfortablewarmhothotswelteringcold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Béchar, Algeria (6,064 miles away); Berriane, Algeria (6,261 miles); and Hajīn, Syria (7,316 miles) are the far-away foreign places with temperatures most similar to McCarran International Airport (view comparison).

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The month of September at McCarran International Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 14% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 13% on September 17.

The clearest day of the month is September 17, with clear, mostly clear, or partly cloudy conditions 87% of the time.

For reference, on February 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 39%, while on June 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 88%.

Cloud Cover Categories in September at McCarran International Airport

Cloud Cover Categories in September at McCarran International AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctFeb 1961%Feb 1961%Sep 186%Sep 186%Sep 3085%Sep 3085%Sep 1187%Sep 1187%Sep 2187%Sep 2187%clearovercastmostly clearmostly cloudypartly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At McCarran International Airport, the chance of a wet day over the course of September is gradually decreasing, starting the month at 8% and ending it at 4%.

For reference, the year's highest daily chance of a wet day is 13% on February 22, and its lowest chance is 1% on June 15.

Probability of Precipitation in September at McCarran International Airport

Probability of Precipitation in September at McCarran International AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%1%1%2%2%3%3%4%4%5%5%6%6%7%7%8%8%9%9%10%10%11%11%AugOctSep 18%Sep 18%Sep 304%Sep 304%Sep 116%Sep 116%Sep 216%Sep 216%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during September at McCarran International Airport is essentially constant, remaining about 0.4 inches throughout, and rarely exceeding 1.1 inches.

The lowest average 31-day accumulation is 0.3 inches on September 30.

Average Monthly Rainfall in September at McCarran International Airport

Average Monthly Rainfall in September at McCarran International AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 in0.0 in0.2 in0.2 in0.4 in0.4 in0.6 in0.6 in0.8 in0.8 in1.0 in1.0 in1.2 in1.2 in1.4 in1.4 inAugOctSep 300.3 inSep 300.3 inSep 10.4 inSep 10.4 inSep 110.4 inSep 110.4 inSep 210.3 inSep 210.3 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of September at McCarran International Airport, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 5 minutes, implying an average daily decrease of 2 minutes, 15 seconds, and weekly decrease of 15 minutes, 44 seconds.

The shortest day of the month is September 30, with 11 hours, 49 minutes of daylight and the longest day is September 1, with 12 hours, 54 minutes of daylight.

Hours of Daylight and Twilight in September at McCarran International Airport

Hours of Daylight and Twilight in September at McCarran International AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 10 minSep 2212 hr, 10 minnightnightdaydaySep 112 hr, 54 minSep 112 hr, 54 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month at McCarran International Airport is 6:12 AM on September 1 and the latest sunrise is 23 minutes later at 6:35 AM on September 30.

The latest sunset is 7:07 PM on September 1 and the earliest sunset is 43 minutes earlier at 6:24 PM on September 30.

Daylight saving time is observed at McCarran International Airport during 2024, but it neither starts nor ends during September, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:23 AM and sets 14 hours, 37 minutes later, at 8:00 PM, while on December 21, the shortest day of the year, it rises at 6:47 AM and sets 9 hours, 42 minutes later, at 4:30 PM.

Sunrise & Sunset with Twilight in September at McCarran International Airport

Sunrise & Sunset with Twilight in September at McCarran International AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct6:12 AM6:12 AMSep 17:07 PMSep 17:07 PM6:35 AM6:35 AMSep 306:24 PMSep 306:24 PM6:20 AM6:20 AMSep 116:52 PMSep 116:52 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of September. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in September at McCarran International Airport

Solar Elevation and Azimuth in September at McCarran International AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAugOct00101020202030304040505060000101020203030304040505060
northeastsouthwest
Solar elevation and azimuth over the course of September 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for September 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in September at McCarran International Airport

Moon Rise, Set & Phases in September at McCarran International AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 44:14 AMAug 44:14 AMAug 1911:26 AMAug 1911:26 AMSep 26:56 PMSep 26:56 PMSep 177:35 PMSep 177:35 PMOct 211:50 AMOct 211:50 AMOct 174:27 AMOct 174:27 AM5:50 AM5:50 AM8:16 PM8:16 PM7:12 PM7:12 PM5:44 AM5:44 AM5:44 AM5:44 AM7:11 PM7:11 PM6:42 PM6:42 PM7:02 AM7:02 AM6:29 AM6:29 AM6:22 PM6:22 PM5:37 PM5:37 PM7:04 AM7:04 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Sep 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
2%4:44 AMENE6:47 PMWNW-11:49 AMS249,304 mi
2
0%5:44 AMENE7:11 PMWNW-12:30 PMS250,671 mi
3
1%6:42 AME7:34 PMW-1:10 PMS251,675 mi
4
3%7:39 AME7:55 PMW-1:48 PMS252,269 mi
5
7%8:35 AME8:17 PMW-2:27 PMS252,388 mi
6
13%9:32 AMESE8:40 PMWSW-3:06 PMS251,956 mi
7
20%10:30 AMESE9:06 PMWSW-3:48 PMS250,902 mi
8
28%11:31 AMESE9:36 PMWSW-4:33 PMS249,169 mi
9
38%12:33 PMESE10:12 PMWSW-5:22 PMS246,740 mi
10
50%1:35 PMSE10:56 PMSW-6:15 PMS243,653 mi
11
59%2:36 PMSE11:49 PMSW-7:13 PMS240,021 mi
12
69%3:32 PMSE--8:12 PMS236,043 mi
13
79%-12:52 AMSW4:22 PMESE9:12 PMS232,001 mi
14
88%-2:02 AMWSW5:04 PMESE10:11 PMS228,240 mi
15
95%-3:17 AMWSW5:41 PMESE11:06 PMS225,124 mi
16
99%-4:32 AMWSW6:13 PMESE11:59 PMS222,980 mi
17
100%-5:47 AMW6:42 PME--
18
100%-7:02 AMW7:11 PME12:50 AMS222,040 mi
19
98%-8:17 AMW7:41 PMENE1:41 AMS222,395 mi
20
92%-9:32 AMWNW8:14 PMENE2:33 AMS223,980 mi
21
84%-10:48 AMWNW8:52 PMENE3:27 AMS226,588 mi
22
75%-12:02 PMWNW9:37 PMNE4:23 AMS229,919 mi
23
64%-1:12 PMNW10:29 PMNE5:22 AMS233,631 mi
24
50%-2:13 PMNW11:28 PMNE6:21 AMS237,402 mi
25
42%-3:05 PMNW-7:18 AMS240,967 mi
26
31%12:30 AMNE3:48 PMWNW-8:12 AMS244,144 mi
27
22%1:34 AMENE4:22 PMWNW-9:02 AMS246,827 mi
28
14%2:37 AMENE4:51 PMWNW-9:48 AMS248,978 mi
29
8%3:37 AMENE5:16 PMWNW-10:30 AMS250,600 mi
30
4%4:36 AME5:39 PMW-11:10 AMS251,722 mi

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy at McCarran International Airport is gradually decreasing during September, falling from 3% to 0% over the course of the month.

For reference, on August 15, the muggiest day of the year, there are muggy conditions 3% of the time, while on October 12, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in September at McCarran International Airport

Humidity Comfort Levels in September at McCarran International AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 13%Sep 13%Sep 300%Sep 300%Sep 111%Sep 111%Sep 210%Sep 210%humidhumidcomfortablecomfortabledrydrymuggymuggy
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at McCarran International Airport is essentially constant during September, remaining within 0.1 miles per hour of 7.2 miles per hour throughout.

For reference, on April 25, the windiest day of the year, the daily average wind speed is 9.4 miles per hour, while on August 27, the calmest day of the year, the daily average wind speed is 7.1 miles per hour.

Average Wind Speed in September at McCarran International Airport

Average Wind Speed in September at McCarran International AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphAugOctSep 17.2 mphSep 17.2 mphSep 307.3 mphSep 307.3 mphSep 117.2 mphSep 117.2 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction at McCarran International Airport during September is predominantly out of the south from September 1 to September 24 and the north from September 24 to September 30.

Wind Direction in September at McCarran International Airport

Wind Direction in September at McCarran International AirportSNSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at McCarran International Airport typically lasts for 11 months (321 days), from around January 22 to around December 8, rarely starting after February 20, or ending before November 18.

The month of September at McCarran International Airport is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in September at McCarran International Airport

Time Spent in Various Temperature Bands and the Growing Season in September at McCarran International Airportgrowing seasongrowing seasonSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct100%Sep 16100%Sep 16coldcoolcomfortablewarmhotsweltering
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days at McCarran International Airport are rapidly increasing during September, increasing by 864°F, from 5,018°F to 5,882°F, over the course of the month.

Growing Degree Days in September at McCarran International Airport

Growing Degree Days in September at McCarran International AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930304,600°F4,600°F4,800°F4,800°F5,000°F5,000°F5,200°F5,200°F5,400°F5,400°F5,600°F5,600°F5,800°F5,800°F6,000°F6,000°F6,200°F6,200°FAugOctSep 15,018°FSep 15,018°FSep 305,882°FSep 305,882°FSep 115,339°FSep 115,339°F
The average growing degree days accumulated over the course of September, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy at McCarran International Airport is decreasing during September, falling by 1.1 kWh, from 6.8 kWh to 5.7 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September at McCarran International Airport

Average Daily Incident Shortwave Solar Energy in September at McCarran International AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhAugOctSep 16.8 kWhSep 16.8 kWhSep 305.7 kWhSep 305.7 kWhSep 116.5 kWhSep 116.5 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of McCarran International Airport are 36.085 deg latitude, -115.151 deg longitude, and 2,093 ft elevation.

The topography within 2 miles of McCarran International Airport contains only modest variations in elevation, with a maximum elevation change of 253 feet and an average elevation above sea level of 2,094 feet. Within 10 miles contains only modest variations in elevation (2,129 feet). Within 50 miles contains large variations in elevation (11,234 feet).

The area within 2 miles of McCarran International Airport is covered by shrubs (65%), artificial surfaces (20%), and bare soil (15%), within 10 miles by shrubs (65%) and artificial surfaces (32%), and within 50 miles by shrubs (91%).

This report illustrates the typical weather at McCarran International Airport, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

McCarran International Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Henderson Executive Airport, North Las Vegas Air Terminal, Nellis Air Force Base, Boulder City Municipal Airport, Creech Air Force Base, Desert Rock Airport, Laughlin/Bullhead International Airport, and Bicycle Lake Army Airfield.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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