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August Weather in Colma California, United States

Daily high temperatures are around 67°F, rarely falling below 62°F or exceeding 75°F.

Daily low temperatures are around 56°F, rarely falling below 53°F or exceeding 60°F.

For reference, on September 19, the hottest day of the year, temperatures in Colma typically range from 56°F to 69°F, while on December 31, the coldest day of the year, they range from 45°F to 55°F.

Average High and Low Temperature in August in Colma

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 August. 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 August in Colma

Average Hourly Temperature in August in ColmaAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJulSepcoldcoolcoolcomfortable
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.

Coquimbo, Chile (5,727 miles away); Portland, Australia (8,046 miles); and Bridport, Australia (7,867 miles) are the far-away foreign places with temperatures most similar to Colma (view comparison).

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The month of August in Colma experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 10% throughout the month.

The clearest day of the month is August 7, with clear, mostly clear, or partly cloudy conditions 92% of the time.

For reference, on January 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on July 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.

Cloud Cover Categories in August in Colma

Cloud Cover Categories in August in ColmaAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepAug 191%Aug 191%Aug 3189%Aug 3189%Aug 1191%Aug 1191%Aug 2190%Aug 2190%clearmostly clearovercast
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.

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 August in Colma is essentially constant, remaining about 0.0 inches throughout, and rarely exceeding 0.2 inches or falling below -0.0 inches.

Average Monthly Rainfall in August in Colma

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 August in Colma, 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, 4 minutes, implying an average daily decrease of 2 minutes, 7 seconds, and weekly decrease of 14 minutes, 52 seconds.

The shortest day of the month is August 31, with 13 hours, 0 minutes of daylight and the longest day is August 1, with 14 hours, 3 minutes of daylight.

Hours of Daylight and Twilight in August in Colma

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 in Colma is 6:14 AM on August 1 and the latest sunrise is 26 minutes later at 6:39 AM on August 31.

The latest sunset is 8:17 PM on August 1 and the earliest sunset is 38 minutes earlier at 7:39 PM on August 31.

Daylight saving time is observed in Colma during 2024, but it neither starts nor ends during August, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:48 AM and sets 14 hours, 46 minutes later, at 8:34 PM, while on December 21, the shortest day of the year, it rises at 7:21 AM and sets 9 hours, 33 minutes later, at 4:55 PM.

Sunrise & Sunset with Twilight in August in Colma

The solar day over the course of August. 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 August in Colma

Solar Elevation and Azimuth in August in ColmaAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJulSep0010102020203030404050505060700001010202030303040405050606070
northeastsouthwest
Solar elevation and azimuth over the course of August 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 August 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 August in Colma

Moon Rise, Set & Phases in August in ColmaAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJulSepJul 53:58 PMJul 53:58 PMJul 213:18 AMJul 213:18 AMAug 44:14 AMAug 44:14 AMAug 1911:26 AMAug 1911:26 AMSep 26:56 PMSep 26:56 PMSep 177:35 PMSep 177:35 PM5:14 AM5:14 AM9:02 PM9:02 PM8:32 PM8:32 PM6:04 AM6:04 AM6:17 AM6:17 AM8:50 PM8:50 PM7:46 PM7:46 PM6:12 AM6:12 AM6:12 AM6:12 AM7:43 PM7:43 PM7:13 PM7:13 PM7:33 AM7:33 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.
Aug 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
8%3:05 AMNE6:57 PMNW-11:02 AMS240,990 mi
2
3%4:07 AMNE7:42 PMWNW-11:58 AMS243,202 mi
3
0%5:12 AMENE8:19 PMWNW-12:49 PMS245,331 mi
4
0%6:17 AMENE8:50 PMWNW-1:37 PMS247,316 mi
5
2%7:20 AMENE9:15 PMWNW-2:21 PMS249,070 mi
6
6%8:20 AMENE9:38 PMW-3:02 PMS250,487 mi
7
11%9:19 AME9:59 PMW-3:41 PMS251,449 mi
8
18%10:17 AME10:20 PMW-4:20 PMS251,836 mi
9
26%11:14 AME10:41 PMWSW-4:58 PMS251,543 mi
10
35%12:13 PMESE11:04 PMWSW-5:39 PMS250,495 mi
11
44%1:13 PMESE11:30 PMWSW-6:22 PMS248,664 mi
12
50%2:16 PMESE--7:09 PMS246,080 mi
13
65%-12:02 AMWSW3:20 PMESE8:01 PMS242,849 mi
14
75%-12:41 AMSW4:25 PMSE8:57 PMS239,154 mi
15
84%-1:30 AMSW5:26 PMSE9:58 PMS235,257 mi
16
91%-2:30 AMSW6:20 PMSE11:00 PMS231,484 mi
17
94%-3:39 AMSW7:07 PMESE--
18
97%-4:55 AMWSW7:46 PMESE12:01 AMS228,184 mi
19
100%-6:12 AMWSW8:19 PMESE12:59 AMS225,675 mi
20
100%-7:29 AMWSW8:48 PME1:53 AMS224,189 mi
21
96%-8:44 AMW9:15 PME2:44 AMS223,833 mi
22
90%-9:58 AMW9:42 PME3:34 AMS224,578 mi
23
81%-11:12 AMWNW10:11 PMENE4:24 AMS226,275 mi
24
71%-12:26 PMWNW10:43 PMENE5:14 AMS228,692 mi
25
59%-1:40 PMWNW11:21 PMENE6:07 AMS231,567 mi
26
50%-2:51 PMNW-7:03 AMS234,644 mi
27
37%12:07 AMNE3:57 PMNW-8:00 AMS237,712 mi
28
26%1:00 AMNE4:54 PMNW-8:57 AMS240,618 mi
29
18%1:59 AMNE5:42 PMNW-9:53 AMS243,268 mi
30
10%3:03 AMENE6:21 PMWNW-10:46 AMS245,613 mi
31
5%4:07 AMENE6:53 PMWNW-11:34 AMS247,637 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 in Colma is essentially constant during August, remaining around 0% throughout.

For reference, on September 6, 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 August in Colma

Humidity Comfort Levels in August in ColmaAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JulSepAug 10%Aug 10%Aug 310%Aug 310%Aug 110%Aug 110%Aug 210%Aug 210%comfortablecomfortabledrydryhumidhumid
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 in Colma is essentially constant during August, remaining within 0.1 miles per hour of 8.3 miles per hour throughout.

For reference, on May 9, the windiest day of the year, the daily average wind speed is 10.2 miles per hour, while on October 4, the calmest day of the year, the daily average wind speed is 7.6 miles per hour.

Average Wind Speed in August in Colma

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 in Colma throughout August is predominantly from the west, with a peak proportion of 92% on August 9.

Wind Direction in August in Colma

Wind Direction in August in ColmaAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JulSepwestnorth
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).

Colma 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 in Colma is essentially constant during August, remaining around 57°F throughout.

Average Water Temperature in August in Colma

Average Water Temperature in August in ColmaAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313152°F52°F53°F53°F54°F54°F55°F55°F56°F56°F57°F57°F58°F58°F59°F59°F60°F60°F61°F61°F62°F62°FJulSepAug 157°FAug 157°FAug 3158°FAug 3158°FAug 1157°FAug 1157°FAug 2158°FAug 2158°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 in Colma 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 August in Colma

Time Spent in Various Temperature Bands and the Growing Season in August in ColmaAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSep100%Aug 16100%Aug 16Jul 14100%Jul 14100%coldcoolcomfortablewarm
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 in Colma are increasing during August, increasing by 311°F, from 1,195°F to 1,507°F, over the course of the month.

Growing Degree Days in August in Colma

Growing Degree Days in August in ColmaAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031311,000°F1,000°F1,100°F1,100°F1,200°F1,200°F1,300°F1,300°F1,400°F1,400°F1,500°F1,500°F1,600°F1,600°F1,700°F1,700°F1,800°F1,800°FJulSepAug 11,195°FAug 11,195°FAug 311,507°FAug 311,507°FAug 111,295°FAug 111,295°FAug 211,400°FAug 211,400°F
The average growing degree days accumulated over the course of August, 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 in Colma is decreasing during August, falling by 1.1 kWh, from 7.9 kWh to 6.8 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in August in Colma

Average Daily Incident Shortwave Solar Energy in August in ColmaAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJulSepAug 17.9 kWhAug 17.9 kWhAug 316.8 kWhAug 316.8 kWhAug 117.6 kWhAug 117.6 kWhAug 217.2 kWhAug 217.2 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 Colma are 37.677 deg latitude, -122.460 deg longitude, and 125 ft elevation.

The topography within 2 miles of Colma contains very significant variations in elevation, with a maximum elevation change of 1,234 feet and an average elevation above sea level of 376 feet. Within 10 miles also contains very significant variations in elevation (1,850 feet). Within 50 miles contains very significant variations in elevation (3,894 feet).

The area within 2 miles of Colma is covered by artificial surfaces (81%) and shrubs (12%), within 10 miles by water (58%) and artificial surfaces (28%), and within 50 miles by water (48%) and grassland (17%).

This report illustrates the typical weather in Colma, 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

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Colma.

For each station, the records are corrected for the elevation difference between that station and Colma according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Colma is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Colma and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Colma and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

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.