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July Weather at Half Moon Bay Airport California, United States

Daily high temperatures are around 63°F, rarely falling below 58°F or exceeding 70°F.

Daily low temperatures increase by 2°F, from 52°F to 54°F, rarely falling below 49°F or exceeding 58°F.

For reference, on October 2, the hottest day of the year, temperatures at Half Moon Bay Airport typically range from 51°F to 66°F, while on December 30, the coldest day of the year, they range from 44°F to 58°F.

Average High and Low Temperature in July at Half Moon Bay 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 July. 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 July at Half Moon Bay Airport

Average Hourly Temperature in July at Half Moon Bay AirportJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJunAugcoldcoldcool
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.

Valparaíso, Chile (5,878 miles away) and Vilaflor, Spain (5,843 miles) are the far-away foreign places with temperatures most similar to Half Moon Bay Airport (view comparison).

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The month of July at Half Moon Bay Airport experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 14% to 10%.

The clearest day of the month is July 19, with clear, mostly clear, or partly cloudy conditions 90% of the time.

For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on August 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.

Cloud Cover Categories in July at Half Moon Bay Airport

Cloud Cover Categories in July at Half Moon Bay AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugJul 186%Jul 186%Jul 3190%Jul 3190%Jul 1189%Jul 1189%Jul 2190%Jul 2190%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.

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 July at Half Moon Bay Airport is essentially constant, remaining about 0.0 inches throughout, and rarely exceeding 0.2 inches or falling below -0.0 inches.

The lowest average 31-day accumulation is 0.0 inches on July 29.

Average Monthly Rainfall in July at Half Moon Bay 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 July at Half Moon Bay Airport, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 38 minutes, implying an average daily decrease of 1 minute, 15 seconds, and weekly decrease of 8 minutes, 47 seconds.

The shortest day of the month is July 31, with 14 hours, 5 minutes of daylight and the longest day is July 1, with 14 hours, 42 minutes of daylight.

Hours of Daylight and Twilight in July at Half Moon Bay Airport

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 Half Moon Bay Airport is 5:52 AM on July 1 and the latest sunrise is 21 minutes later at 6:13 AM on July 31.

The latest sunset is 8:35 PM on July 1 and the earliest sunset is 17 minutes earlier at 8:18 PM on July 31.

Daylight saving time is observed at Half Moon Bay Airport during 2024, but it neither starts nor ends during July, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:49 AM and sets 14 hours, 45 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, 34 minutes later, at 4:55 PM.

Sunrise & Sunset with Twilight in July at Half Moon Bay Airport

The solar day over the course of July. 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 July at Half Moon Bay Airport

Solar Elevation and Azimuth in July at Half Moon Bay AirportJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJunAug0010102020203030404050505060607070000101020203030304040505060606070
northeastsouthwest
Solar elevation and azimuth over the course of July 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 July 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 July at Half Moon Bay Airport

Moon Rise, Set & Phases in July at Half Moon Bay AirportJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJunAugJun 65:38 AMJun 65:38 AMJun 216:09 PMJun 216:09 PMJul 53:58 PMJul 53:58 PMJul 213:18 AMJul 213:18 AMAug 44:14 AMAug 44:14 AMAug 1911:26 AMAug 1911:26 AM5:33 AM5:33 AM9:21 PM9:21 PM8:56 PM8:56 PM6:03 AM6:03 AM5:15 AM5:15 AM9:01 PM9:01 PM8:32 PM8:32 PM6:05 AM6:05 AM6:17 AM6:17 AM8:49 PM8:49 PM7:45 PM7:45 PM6:12 AM6:12 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.
Jul 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
21%2:08 AMENE4:46 PMWNW-9:23 AMS232,331 mi
2
12%2:43 AMENE5:58 PMWNW-10:17 AMS233,850 mi
3
6%3:26 AMNE7:07 PMNW-11:14 AMS235,692 mi
4
2%4:17 AMNE8:09 PMNW-12:12 PMS237,833 mi
5
0%5:15 AMNE9:01 PMNW-1:10 PMS240,207 mi
6
1%6:19 AMNE9:44 PMWNW-2:05 PMS242,701 mi
7
4%7:25 AMENE10:19 PMWNW-2:56 PMS245,162 mi
8
9%8:29 AMENE10:48 PMWNW-3:42 PMS247,416 mi
9
16%9:31 AMENE11:13 PMWNW-4:25 PMS249,283 mi
10
24%10:31 AME11:35 PMW-5:05 PMS250,599 mi
11
32%11:29 AME11:56 PMW-5:44 PMS251,223 mi
12
42%12:26 PME--6:23 PMS251,062 mi
13
50%-12:16 AMW1:24 PMESE7:02 PMS250,075 mi
14
61%-12:39 AMWSW2:24 PMESE7:44 PMS248,285 mi
15
71%-1:03 AMWSW3:26 PMESE8:29 PMS245,785 mi
16
80%-1:32 AMWSW4:30 PMESE9:19 PMS242,734 mi
17
88%-2:08 AMWSW5:36 PMSE10:14 PMS239,355 mi
18
94%-2:52 AMSW6:41 PMSE11:14 PMS235,919 mi
19
97%-3:47 AMSW7:40 PMSE--
20
98%-4:52 AMSW8:32 PMESE12:16 AMS232,723 mi
21
100%-6:05 AMWSW9:14 PMESE1:18 AMS230,044 mi
22
99%-7:21 AMWSW9:50 PMESE2:17 AMS228,098 mi
23
95%-8:36 AMWSW10:20 PMESE3:13 AMS227,002 mi
24
88%-9:50 AMW10:48 PME4:04 AMS226,766 mi
25
79%-11:02 AMW11:14 PME4:53 AMS227,309 mi
26
68%-12:14 PMW11:41 PMENE5:41 AMS228,490 mi
27
50%-1:25 PMWNW-6:29 AMS230,142 mi
28
45%12:10 AMENE2:37 PMWNW-7:19 AMS232,104 mi
29
33%12:44 AMENE3:49 PMWNW-8:12 AMS234,247 mi
30
23%1:23 AMENE4:58 PMNW-9:08 AMS236,478 mi
31
14%2:11 AMNE6:02 PMNW-10:05 AMS238,739 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 Half Moon Bay Airport is essentially constant during July, remaining around 0% throughout.

For reference, on September 8, the muggiest day of the year, there are muggy conditions 0% 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 July at Half Moon Bay Airport

Humidity Comfort Levels in July at Half Moon Bay AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JunAugJul 10%Jul 10%Jul 310%Jul 310%Jul 110%Jul 110%Jul 210%Jul 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 at Half Moon Bay Airport is decreasing during July, decreasing from 10.0 miles per hour to 8.9 miles per hour over the course of the month.

For reference, on May 8, the windiest day of the year, the daily average wind speed is 11.2 miles per hour, while on October 4, the calmest day of the year, the daily average wind speed is 8.2 miles per hour.

Average Wind Speed in July at Half Moon Bay Airport

Average Wind Speed in July at Half Moon Bay AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphJunAugJul 110.0 mphJul 110.0 mphJul 318.9 mphJul 318.9 mphJul 119.4 mphJul 119.4 mphJul 219.1 mphJul 219.1 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 Half Moon Bay Airport throughout July is predominantly from the west, with a peak proportion of 90% on July 31.

Wind Direction in July at Half Moon Bay Airport

Wind Direction in July at Half Moon Bay AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JunAugwestsouth
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).

Half Moon Bay 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 Half Moon Bay Airport is gradually increasing during July, rising by 2°F, from 55°F to 57°F, over the course of the month.

Average Water Temperature in July at Half Moon Bay Airport

Average Water Temperature in July at Half Moon Bay AirportJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313150°F50°F52°F52°F54°F54°F56°F56°F58°F58°F60°F60°F62°F62°FJunAugJul 155°FJul 155°FJul 3157°FJul 3157°FJul 1156°FJul 1156°FJul 2157°FJul 2157°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 Half Moon Bay 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 July at Half Moon Bay Airport

Time Spent in Various Temperature Bands and the Growing Season in July at Half Moon Bay Airportgrowing seasonJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAug100%Jul 16100%Jul 16coldcoolcomfortable
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 Half Moon Bay Airport are increasing during July, increasing by 230°F, from 705°F to 935°F, over the course of the month.

Growing Degree Days in July at Half Moon Bay Airport

Growing Degree Days in July at Half Moon Bay AirportJul1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131500°F500°F600°F600°F700°F700°F800°F800°F900°F900°F1,000°F1,000°F1,100°F1,100°F1,200°F1,200°FJunAugJul 1705°FJul 1705°FJul 31935°FJul 31935°FJul 11777°FJul 11777°FJul 21854°FJul 21854°F
The average growing degree days accumulated over the course of July, 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 Half Moon Bay Airport is essentially constant during July, remaining within 0.2 kWh of 8.1 kWh throughout.

Average Daily Incident Shortwave Solar Energy in July at Half Moon Bay Airport

Average Daily Incident Shortwave Solar Energy in July at Half Moon Bay AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJunAugJul 18.3 kWhJul 18.3 kWhJul 317.9 kWhJul 317.9 kWhJul 118.2 kWhJul 118.2 kWhJul 218.1 kWhJul 218.1 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 Half Moon Bay Airport are 37.515 deg latitude, -122.500 deg longitude, and 39 ft elevation.

The topography within 2 miles of Half Moon Bay Airport contains very significant variations in elevation, with a maximum elevation change of 961 feet and an average elevation above sea level of 132 feet. Within 10 miles contains very significant variations in elevation (2,051 feet). Within 50 miles contains large variations in elevation (4,314 feet).

The area within 2 miles of Half Moon Bay Airport is covered by water (37%), artificial surfaces (17%), herbaceous vegetation (16%), and trees (12%), within 10 miles by water (59%) and trees (14%), and within 50 miles by water (57%) and grassland (13%).

This report illustrates the typical weather at Half Moon Bay 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

Half Moon Bay 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 San Francisco International Airport, Naval Air Station Alameda (historical), Oakland International Airport, Hayward Air Terminal Airport, Moffett Federal Airfield, Norman Y. Mineta San José International Airport, Gnoss Field, and Buchanan Field 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.

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