1. WeatherSpark.com
  2. United States
  3. California
  4. Ukiah Municipal Airport

September Weather at Ukiah Municipal Airport California, United States

Daily high temperatures decrease by 6°F, from 89°F to 83°F, rarely falling below 70°F or exceeding 99°F.

Daily low temperatures decrease by 4°F, from 53°F to 49°F, rarely falling below 43°F or exceeding 58°F.

For reference, on July 28, the hottest day of the year, temperatures at Ukiah Municipal Airport typically range from 56°F to 93°F, while on December 31, the coldest day of the year, they range from 36°F to 55°F.

Average High and Low Temperature in September at Ukiah Municipal Airport

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 Ukiah Municipal Airport

Average Hourly Temperature in September at Ukiah 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 AMAugOctcoldcoldcoolcoolcomfortablewarmhotcomfortable
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.

Santiago, Chile (6,044 miles away); Salar, Spain (5,908 miles); and Wangaratta, Australia (7,767 miles) are the far-away foreign places with temperatures most similar to Ukiah Municipal Airport (view comparison).

Map
Marker
© OpenStreetMap contributors

Compare Ukiah Municipal Airport to another city:

Map

The month of September at Ukiah Municipal Airport experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 13% to 22%.

The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 87% of the time.

For reference, on January 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 64%, while on July 31, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.

Cloud Cover Categories in September at Ukiah Municipal Airport

Cloud Cover Categories in September at Ukiah Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 187%Sep 187%Sep 3078%Sep 3078%Sep 1185%Sep 1185%Sep 2183%Sep 2183%clearovercastmostly clearpartly cloudymostly 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 Ukiah Municipal Airport, the chance of a wet day over the course of September is increasing, starting the month at 2% and ending it at 7%.

For reference, the year's highest daily chance of a wet day is 37% on February 28, and its lowest chance is 0% on August 2.

Probability of Precipitation in September at Ukiah Municipal Airport

Probability of Precipitation in September at Ukiah Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%2%2%4%4%6%6%8%8%10%10%12%12%14%14%16%16%18%18%20%20%22%22%AugOctSep 12%Sep 12%Sep 307%Sep 307%Sep 114%Sep 114%Sep 215%Sep 215%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 Ukiah Municipal Airport is increasing, starting the month at 0.2 inches, when it rarely exceeds 0.7 inches or falls below -0.0 inches, and ending the month at 0.8 inches, when it rarely exceeds 2.5 inches.

Average Monthly Rainfall in September at Ukiah Municipal Airport

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 Ukiah 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, 13 minutes, implying an average daily decrease of 2 minutes, 31 seconds, and weekly decrease of 17 minutes, 34 seconds.

The shortest day of the month is September 30, with 11 hours, 47 minutes of daylight and the longest day is September 1, with 13 hours, 0 minutes of daylight.

Hours of Daylight and Twilight in September at Ukiah Municipal Airport

Hours of Daylight and Twilight in September at Ukiah Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 10 minSep 2212 hr, 10 minnightnightdaydaySep 113 hr, 0 minSep 113 hr, 0 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 Ukiah Municipal Airport is 6:42 AM on September 1 and the latest sunrise is 26 minutes later at 7:08 AM on September 30.

The latest sunset is 7:42 PM on September 1 and the earliest sunset is 46 minutes earlier at 6:55 PM on September 30.

Daylight saving time is observed at Ukiah 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 5:46 AM and sets 14 hours, 55 minutes later, at 8:42 PM, while on December 21, the shortest day of the year, it rises at 7:28 AM and sets 9 hours, 25 minutes later, at 4:53 PM.

Sunrise & Sunset with Twilight in September at Ukiah Municipal Airport

Sunrise & Sunset with Twilight in September at Ukiah Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct6:42 AM6:42 AMSep 17:42 PMSep 17:42 PM7:08 AM7:08 AMSep 306:55 PMSep 306:55 PM6:51 AM6:51 AMSep 117:26 PMSep 117:26 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 Ukiah Municipal Airport

Solar Elevation and Azimuth in September at Ukiah 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 AMAugOct0010102020203030404050500001010202030303040405060
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 Ukiah Municipal Airport

Moon Rise, Set & Phases in September at Ukiah 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 AM6:16 AM6:16 AM8:56 PM8:56 PM7:52 PM7:52 PM6:12 AM6:12 AM6:13 AM6:13 AM7:47 PM7:47 PM7:16 PM7:16 PM7:36 AM7:36 AM7:04 AM7:04 AM6:53 PM6:53 PM6:07 PM6:07 PM7:42 AM7:42 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%5:11 AMENE7:25 PMWNW-12:22 PMS249,338 mi
2
0%6:13 AMENE7:47 PMWNW-1:03 PMS250,698 mi
3
1%7:13 AME8:08 PMW-1:43 PMS251,693 mi
4
3%8:12 AME8:27 PMW-2:21 PMS252,277 mi
5
7%9:10 AME8:47 PMW-3:00 PMS252,384 mi
6
13%10:09 AMESE9:08 PMWSW-3:39 PMS251,940 mi
7
20%11:10 AMESE9:32 PMWSW-4:21 PMS250,871 mi
8
29%12:12 PMESE10:00 PMWSW-5:06 PMS249,122 mi
9
38%1:16 PMESE10:34 PMSW-5:55 PMS246,678 mi
10
50%2:20 PMSE11:17 PMSW-6:49 PMS243,578 mi
11
59%3:22 PMSE--7:46 PMS239,936 mi
12
70%-12:11 AMSW4:17 PMSE8:46 PMS235,952 mi
13
80%-1:14 AMSW5:06 PMSE9:46 PMS231,912 mi
14
88%-2:26 AMWSW5:46 PMESE10:44 PMS228,161 mi
15
95%-3:43 AMWSW6:20 PMESE11:40 PMS225,064 mi
16
97%-5:01 AMWSW6:49 PMESE--
17
100%-6:19 AMW7:16 PME12:33 AMS222,945 mi
18
100%-7:36 AMW7:43 PME1:24 AMS222,034 mi
19
98%-8:54 AMW8:10 PMENE2:15 AMS222,418 mi
20
92%-10:12 AMWNW8:41 PMENE3:07 AMS224,028 mi
21
84%-11:30 AMWNW9:16 PMENE4:00 AMS226,657 mi
22
74%-12:47 PMNW9:59 PMNE4:57 AMS230,000 mi
23
63%-1:57 PMNW10:50 PMNE5:55 AMS233,716 mi
24
50%-2:59 PMNW11:49 PMNE6:54 AMS237,485 mi
25
41%-3:50 PMNW-7:52 AMS241,043 mi
26
31%12:53 AMNE4:30 PMWNW-8:45 AMS244,209 mi
27
22%1:59 AMENE5:03 PMWNW-9:35 AMS246,881 mi
28
14%3:03 AMENE5:30 PMWNW-10:21 AMS249,020 mi
29
8%4:06 AMENE5:53 PMWNW-11:03 AMS250,630 mi
30
4%5:06 AME6:14 PMW-11:43 AMS251,741 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 Ukiah Municipal Airport is essentially constant during September, remaining around 0% throughout.

For reference, on July 12, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in September at Ukiah Municipal Airport

Humidity Comfort Levels in September at Ukiah Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 10%Sep 10%Sep 300%Sep 300%Sep 110%Sep 110%Sep 210%Sep 210%comfortablecomfortabledrydry
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 Ukiah Municipal Airport is essentially constant during September, remaining within 0.1 miles per hour of 4.6 miles per hour throughout.

For reference, on June 5, the windiest day of the year, the daily average wind speed is 5.7 miles per hour, while on September 20, the calmest day of the year, the daily average wind speed is 4.6 miles per hour.

The lowest daily average wind speed during September is 4.6 miles per hour on September 20.

Average Wind Speed in September at Ukiah Municipal Airport

Average Wind Speed in September at Ukiah Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mphAugOctSep 204.6 mphSep 204.6 mphSep 14.7 mphSep 14.7 mphSep 304.6 mphSep 304.6 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 Ukiah Municipal Airport during September is predominantly out of the west from September 1 to September 2 and the north from September 2 to September 30.

Wind Direction in September at Ukiah Municipal Airport

Wind Direction in September at Ukiah Municipal AirportWNSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctwestnorthsoutheast
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).

Ukiah 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 Ukiah Municipal Airport is essentially constant during September, remaining around 56°F throughout.

The highest average surface water temperature during September is 56°F on September 23.

Average Water Temperature in September at Ukiah Municipal Airport

Average Water Temperature in September at Ukiah Municipal AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303051°F51°F52°F52°F53°F53°F54°F54°F55°F55°F56°F56°F57°F57°F58°F58°F59°F59°F60°F60°FAugOctSep 2356°FSep 2356°FSep 156°FSep 156°FSep 1156°FSep 1156°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).

The growing season at Ukiah Municipal Airport typically lasts for 8.5 months (262 days), from around March 2 to around November 19, rarely starting before January 28 or after April 6, and rarely ending before October 29 or after December 10.

The month of September at Ukiah Municipal Airport is reliably fully within the growing season.

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

Time Spent in Various Temperature Bands and the Growing Season in September at Ukiah Municipal Airportgrowing 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 1690%Oct 2990%Oct 29very coldcoldcoolcomfortablewarmhotsweltering
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 Ukiah Municipal Airport are rapidly increasing during September, increasing by 473°F, from 2,596°F to 3,069°F, over the course of the month.

Growing Degree Days in September at Ukiah Municipal Airport

Growing Degree Days in September at Ukiah Municipal AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302,400°F2,400°F2,600°F2,600°F2,800°F2,800°F3,000°F3,000°F3,200°F3,200°FAugOctSep 12,596°FSep 12,596°FSep 303,069°FSep 303,069°FSep 112,774°FSep 112,774°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 Ukiah Municipal Airport is rapidly decreasing during September, falling by 1.6 kWh, from 6.8 kWh to 5.2 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September at Ukiah Municipal Airport

Average Daily Incident Shortwave Solar Energy in September at Ukiah Municipal 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 305.2 kWhSep 305.2 kWhSep 116.2 kWhSep 116.2 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 Ukiah Municipal Airport are 39.126 deg latitude, -123.202 deg longitude, and 610 ft elevation.

The topography within 2 miles of Ukiah Municipal Airport contains very significant variations in elevation, with a maximum elevation change of 1,916 feet and an average elevation above sea level of 842 feet. Within 10 miles contains very significant variations in elevation (3,409 feet). Within 50 miles also contains extreme variations in elevation (7,362 feet).

The area within 2 miles of Ukiah Municipal Airport is covered by cropland (38%), artificial surfaces (29%), and shrubs (27%), within 10 miles by shrubs (62%) and trees (18%), and within 50 miles by shrubs (37%) and trees (28%).

This report illustrates the typical weather at Ukiah 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

Ukiah 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 Sonoma County Airport, Gnoss Field, Napa County Airport, Red Bluff Municipal Airport, Chico Municipal Airport, Oroville Municipal Airport, Yuba County Airport, and Redding Municipal Airport.

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.

Please review our full terms contained on our Terms of Service page.