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September Weather at Santa Monica Municipal Airport California, United States

Daily high temperatures are around 75°F, rarely falling below 68°F or exceeding 84°F.

Daily low temperatures decrease by 3°F, from 64°F to 61°F, rarely falling below 57°F or exceeding 69°F.

For reference, on August 25, the hottest day of the year, temperatures at Santa Monica Municipal Airport typically range from 65°F to 76°F, while on December 24, the coldest day of the year, they range from 49°F to 65°F.

Average High and Low Temperature in September at Santa Monica Municipal Airport

Average High and Low Temperature in September at Santa Monica Municipal AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303050°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FAugOctSep 176°FSep 176°F64°F64°FSep 3075°FSep 3075°F61°F61°FSep 1176°FSep 1176°F64°F64°FSep 2175°FSep 2175°F62°F62°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 Santa Monica Municipal Airport

Average Hourly Temperature in September at Santa Monica Municipal 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 AMAugOctcoolcoolcomfortablewarmcool
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.

Knysna, South Africa (10,257 miles away) is the far-away foreign place with temperatures most similar to Santa Monica Municipal Airport (view comparison).

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The month of September at Santa Monica Municipal Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 11% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 9% on September 6.

The clearest day of the month is September 6, with clear, mostly clear, or partly cloudy conditions 91% of the time.

For reference, on February 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 43%, while on September 6, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.

Cloud Cover Categories in September at Santa Monica Municipal Airport

Cloud Cover Categories in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctFeb 2257%Feb 2257%Sep 191%Sep 191%Sep 3087%Sep 3087%Sep 1191%Sep 1191%Sep 2189%Sep 2189%clearovercastmostly clearpartly 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 Santa Monica Municipal Airport, the chance of a wet day over the course of September is gradually increasing, starting the month at 0% and ending it at 3%.

For reference, the year's highest daily chance of a wet day is 21% on February 20, and its lowest chance is 0% on July 1.

Probability of Precipitation in September at Santa Monica Municipal Airport

Probability of Precipitation in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%1%1%2%2%3%3%4%4%5%5%6%6%7%7%8%8%AugOctSep 10%Sep 10%Sep 303%Sep 303%Sep 111%Sep 111%Sep 212%Sep 212%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 Santa Monica Municipal Airport is gradually increasing, starting the month at 0.1 inches, when it rarely exceeds 0.2 inches or falls below -0.0 inches, and ending the month at 0.3 inches, when it rarely exceeds 1.0 inches or falls below -0.0 inches.

Average Monthly Rainfall in September at Santa Monica Municipal Airport

Average Monthly Rainfall in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 inAugOctSep 10.1 inSep 10.1 inSep 300.3 inSep 300.3 inSep 110.1 inSep 110.1 inSep 210.2 inSep 210.2 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 Santa Monica Municipal 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, 0 minutes, implying an average daily decrease of 2 minutes, 5 seconds, and weekly decrease of 14 minutes, 34 seconds.

The shortest day of the month is September 30, with 11 hours, 50 minutes of daylight and the longest day is September 1, with 12 hours, 51 minutes of daylight.

Hours of Daylight and Twilight in September at Santa Monica Municipal Airport

Hours of Daylight and Twilight in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 9 minSep 2212 hr, 9 minnightnightdaydaySep 112 hr, 51 minSep 112 hr, 51 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 Santa Monica Municipal Airport is 6:27 AM on September 1 and the latest sunrise is 20 minutes later at 6:48 AM on September 30.

The latest sunset is 7:18 PM on September 1 and the earliest sunset is 40 minutes earlier at 6:38 PM on September 30.

Daylight saving time is observed at Santa Monica Municipal Airport during 2024, but it neither starts nor ends during September, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:42 AM and sets 14 hours, 25 minutes later, at 8:08 PM, while on December 21, the shortest day of the year, it rises at 6:55 AM and sets 9 hours, 53 minutes later, at 4:48 PM.

Sunrise & Sunset with Twilight in September at Santa Monica Municipal Airport

Sunrise & Sunset with Twilight in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct6:27 AM6:27 AMSep 17:18 PMSep 17:18 PM6:48 AM6:48 AMSep 306:38 PMSep 306:38 PM6:34 AM6:34 AMSep 117:05 PMSep 117:05 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 Santa Monica Municipal Airport

Solar Elevation and Azimuth in September at Santa Monica Municipal 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 Santa Monica Municipal Airport

Moon Rise, Set & Phases in September at Santa Monica Municipal 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 AM6:09 AM6:09 AM8:26 PM8:26 PM7:21 PM7:21 PM6:02 AM6:02 AM6:01 AM6:01 AM7:23 PM7:23 PM6:55 PM6:55 PM7:16 AM7:16 AM6:42 AM6:42 AM6:37 PM6:37 PM5:52 PM5:52 PM7:15 AM7:15 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%5:02 AMENE6:57 PMWNW-12:03 PMS249,318 mi
2
0%6:01 AMENE7:23 PMWNW-12:44 PMS250,682 mi
3
1%6:57 AME7:46 PMW-1:24 PMS251,683 mi
4
3%7:53 AME8:09 PMW-2:02 PMS252,272 mi
5
7%8:48 AME8:32 PMW-2:41 PMS252,386 mi
6
13%9:43 AMESE8:56 PMWSW-3:20 PMS251,949 mi
7
20%10:40 AMESE9:23 PMWSW-4:02 PMS250,889 mi
8
28%11:39 AMESE9:55 PMWSW-4:47 PMS249,149 mi
9
38%12:40 PMESE10:32 PMWSW-5:36 PMS246,714 mi
10
50%1:42 PMESE11:17 PMSW-6:29 PMS243,622 mi
11
59%2:42 PMSE--7:26 PMS239,986 mi
12
69%-12:11 AMSW3:38 PMSE8:26 PMS236,006 mi
13
79%-1:13 AMSW4:29 PMESE9:26 PMS231,965 mi
14
88%-2:23 AMWSW5:13 PMESE10:24 PMS228,208 mi
15
95%-3:35 AMWSW5:50 PMESE11:20 PMS225,100 mi
16
97%-4:49 AMWSW6:24 PMESE--
17
100%-6:03 AMW6:55 PME12:12 AMS222,966 mi
18
100%-7:16 AMW7:26 PME1:04 AMS222,038 mi
19
98%-8:29 AMW7:58 PMENE1:54 AMS222,404 mi
20
92%-9:42 AMWNW8:32 PMENE2:46 AMS223,999 mi
21
84%-10:57 AMWNW9:12 PMENE3:40 AMS226,616 mi
22
74%-12:09 PMWNW9:57 PMENE4:37 AMS229,951 mi
23
64%-1:18 PMNW10:50 PMNE5:36 AMS233,666 mi
24
50%-2:19 PMNW11:49 PMNE6:35 AMS237,436 mi
25
41%-3:12 PMNW-7:32 AMS240,998 mi
26
31%12:51 AMENE3:55 PMWNW-8:26 AMS244,171 mi
27
22%1:54 AMENE4:31 PMWNW-9:16 AMS246,850 mi
28
14%2:55 AMENE5:01 PMWNW-10:01 AMS248,995 mi
29
8%3:54 AMENE5:27 PMWNW-10:44 AMS250,613 mi
30
4%4:52 AME5:51 PMW-11:24 AMS251,730 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 Santa Monica Municipal Airport is gradually decreasing during September, falling from 8% to 4% over the course of the month.

For reference, on August 4, the muggiest day of the year, there are muggy conditions 9% of the time, while on November 28, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in September at Santa Monica Municipal Airport

Humidity Comfort Levels in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 18%Sep 18%Sep 304%Sep 304%Sep 118%Sep 118%Sep 216%Sep 216%muggymuggyhumidhumidcomfortablecomfortabledrydry
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 Santa Monica Municipal Airport is gradually increasing during September, increasing from 5.3 miles per hour to 5.9 miles per hour over the course of the month.

For reference, on December 30, the windiest day of the year, the daily average wind speed is 9.1 miles per hour, while on August 13, the calmest day of the year, the daily average wind speed is 5.2 miles per hour.

Average Wind Speed in September at Santa Monica Municipal Airport

Average Wind Speed in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphAugOctSep 15.3 mphSep 15.3 mphSep 305.9 mphSep 305.9 mphSep 115.4 mphSep 115.4 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction at Santa Monica Municipal Airport throughout September is predominantly from the west, with a peak proportion of 43% on September 3.

Wind Direction in September at Santa Monica Municipal Airport

Wind Direction in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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).

Santa Monica Municipal Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature at Santa Monica Municipal Airport is essentially constant during September, remaining within 1°F of 67°F throughout.

Average Water Temperature in September at Santa Monica Municipal Airport

Average Water Temperature in September at Santa Monica Municipal AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303062°F62°F64°F64°F66°F66°F68°F68°F70°F70°F72°F72°FAugOctSep 168°FSep 168°FSep 3067°FSep 3067°FSep 1168°FSep 1168°FSep 2167°FSep 2167°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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).

Temperatures at Santa Monica Municipal Airport are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in September at Santa Monica Municipal Airport

Time Spent in Various Temperature Bands and the Growing Season in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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 16coolcomfortablewarmcold
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 Santa Monica Municipal Airport are rapidly increasing during September, increasing by 536°F, from 3,114°F to 3,650°F, over the course of the month.

Growing Degree Days in September at Santa Monica Municipal Airport

Growing Degree Days in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302,800°F2,800°F3,000°F3,000°F3,200°F3,200°F3,400°F3,400°F3,600°F3,600°F3,800°F3,800°F4,000°F4,000°F4,200°F4,200°FAugOctSep 13,114°FSep 13,114°FSep 303,650°FSep 303,650°FSep 113,305°FSep 113,305°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 Santa Monica Municipal Airport is decreasing during September, falling by 1.3 kWh, from 7.0 kWh to 5.7 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September at Santa Monica Municipal Airport

Average Daily Incident Shortwave Solar Energy in September at Santa Monica Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhAugOctSep 17.0 kWhSep 17.0 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 Santa Monica Municipal Airport are 34.016 deg latitude, -118.452 deg longitude, and 141 ft elevation.

The topography within 2 miles of Santa Monica Municipal Airport contains only modest variations in elevation, with a maximum elevation change of 210 feet and an average elevation above sea level of 106 feet. Within 10 miles contains only modest variations in elevation (2,106 feet). Within 50 miles contains large variations in elevation (10,000 feet).

The area within 2 miles of Santa Monica Municipal Airport is covered by artificial surfaces (99%), within 10 miles by artificial surfaces (53%) and water (29%), and within 50 miles by water (38%) and shrubs (30%).

This report illustrates the typical weather at Santa Monica Municipal 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

Santa Monica Municipal 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 Los Angeles International Airport, Jack Northrop Field/Hawthorne Municipal Airport, Los Angeles / USC Campus Downtown, Van Nuys Airport, Burbank Bob Hope Airport, Long Beach Airport, Newhall, and Long Beach.

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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