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May Weather at Siem Reap International Airport Cambodia

Daily high temperatures decrease by 3°F, from 95°F to 92°F, rarely falling below 87°F or exceeding 101°F.

Daily low temperatures are around 81°F, rarely falling below 78°F or exceeding 84°F.

For reference, on April 17, the hottest day of the year, temperatures at Siem Reap International Airport typically range from 81°F to 96°F, while on January 1, the coldest day of the year, they range from 70°F to 85°F.

Average High and Low Temperature in May at Siem Reap International 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 May. 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 May at Siem Reap International Airport

Average Hourly Temperature in May at Siem Reap International AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMAprJunwarmwarmhotsweltering
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.

Juchitán de Zaragoza, Mexico (10,018 miles away); Santarém, Brazil (10,797 miles); and São Bento, Brazil (10,182 miles) are the far-away foreign places with temperatures most similar to Siem Reap International Airport (view comparison).

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The month of May at Siem Reap International Airport experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 86% to 90%.

The clearest day of the month is May 1, with clear, mostly clear, or partly cloudy conditions 14% of the time.

For reference, on August 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 92%, while on February 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 55%.

Cloud Cover Categories in May at Siem Reap International Airport

Cloud Cover Categories in May at Siem Reap International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 114%May 114%May 3110%May 3110%May 1112%May 1112%May 2110%May 2110%partly cloudymostly cloudyovercastclear
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 Siem Reap International Airport, the chance of a wet day over the course of May is very rapidly increasing, starting the month at 41% and ending it at 58%.

For reference, the year's highest daily chance of a wet day is 71% on September 7, and its lowest chance is 2% on December 19.

Probability of Precipitation in May at Siem Reap International Airport

Probability of Precipitation in May at Siem Reap International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%AprJunMay 141%May 141%May 3158%May 3158%May 1150%May 1150%May 2156%May 2156%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 May at Siem Reap International Airport is very rapidly increasing, starting the month at 3.5 inches, when it rarely exceeds 6.1 inches or falls below 1.6 inches, and ending the month at 5.6 inches, when it rarely exceeds 9.0 inches or falls below 2.8 inches.

Average Monthly Rainfall in May at Siem Reap International 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 May at Siem Reap International Airport, the length of the day is essentially constant. The shortest day of the month is May 1, with 12 hours, 37 minutes of daylight and the longest day is May 31, with 12 hours, 52 minutes of daylight.

Hours of Daylight and Twilight in May at Siem Reap International Airport

Hours of Daylight and Twilight in May at Siem Reap International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAprJunnightnightdaydayMay 112 hr, 37 minMay 112 hr, 37 minMay 3112 hr, 52 minMay 3112 hr, 52 minMay 1612 hr, 45 minMay 1612 hr, 45 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 latest sunrise of the month at Siem Reap International Airport is 5:43 AM on May 1 and the earliest sunrise is 7 minutes earlier at 5:36 AM on May 31.

The earliest sunset is 6:20 PM on May 1 and the latest sunset is 8 minutes later at 6:28 PM on May 31.

Daylight saving time is not observed at Siem Reap International Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:38 AM and sets 12 hours, 55 minutes later, at 6:33 PM, while on December 21, the shortest day of the year, it rises at 6:22 AM and sets 11 hours, 20 minutes later, at 5:43 PM.

Sunrise & Sunset with Twilight in May at Siem Reap International Airport

The solar day over the course of May. 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 May at Siem Reap International Airport

Solar Elevation and Azimuth in May at Siem Reap International AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMAprJun0010102020203030404050505060607070808080000101020203030304040505060606070708080
northeastsouthwest
Solar elevation and azimuth over the course of May 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 May 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 May at Siem Reap International Airport

Moon Rise, Set & Phases in May at Siem Reap International AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAprJunApr 91:22 AMApr 91:22 AMApr 246:50 AMApr 246:50 AMMay 810:23 AMMay 810:23 AMMay 238:54 PMMay 238:54 PMJun 67:38 PMJun 67:38 PMJun 228:09 AMJun 228:09 AM6:06 AM6:06 AM6:55 PM6:55 PM5:49 PM5:49 PM5:44 AM5:44 AM5:28 AM5:28 AM6:38 PM6:38 PM6:17 PM6:17 PM5:51 AM5:51 AM5:00 AM5:00 AM6:26 PM6:26 PM6:02 PM6:02 PM5:31 AM5:31 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.
May 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
50%12:11 AMESE11:49 AMWSW-6:00 AMS233,393 mi
2
44%1:01 AMESE12:48 PMWSW-6:55 AMS230,964 mi
3
33%1:48 AMESE1:46 PMWSW-7:47 AMS228,782 mi
4
22%2:32 AME2:43 PMW-8:37 AMS227,040 mi
5
13%3:14 AME3:40 PMW-9:26 AMS225,945 mi
6
6%3:57 AME4:37 PMW-10:15 AMS225,680 mi
7
1%4:41 AMENE5:36 PMWNW-11:07 AMN226,365 mi
8
0%5:28 AMENE6:38 PMWNW-12:01 PMN228,018 mi
9
2%6:19 AMENE7:41 PMWNW-12:58 PMN230,542 mi
10
6%7:14 AMENE8:43 PMWNW-1:58 PMN233,730 mi
11
13%8:12 AMENE9:43 PMWNW-2:58 PMN237,295 mi
12
21%9:11 AMENE10:38 PMWNW-3:56 PMN240,918 mi
13
30%10:09 AMENE11:28 PMWNW-4:50 PMN244,296 mi
14
40%11:03 AMENE--5:39 PMN247,178 mi
15
50%-12:11 AMWNW11:54 AMENE6:24 PMN249,382 mi
16
60%-12:51 AMWNW12:43 PMENE7:06 PMS250,804 mi
17
69%-1:26 AMW1:28 PME7:45 PMS251,406 mi
18
78%-2:00 AMW2:13 PME8:24 PMS251,219 mi
19
85%-2:34 AMW2:58 PME9:03 PMS250,327 mi
20
91%-3:07 AMW3:44 PME9:43 PMS248,852 mi
21
96%-3:43 AMWSW4:32 PMESE10:26 PMS246,943 mi
22
99%-4:21 AMWSW5:22 PMESE11:12 PMS244,756 mi
23
100%-5:03 AMWSW6:17 PMESE--
24
100%-5:51 AMWSW7:14 PMESE12:03 AMS242,441 mi
25
98%-6:44 AMWSW8:13 PMESE12:59 AMS240,130 mi
26
95%-7:41 AMWSW9:12 PMESE1:57 AMS237,923 mi
27
88%-8:42 AMWSW10:07 PMESE2:57 AMS235,883 mi
28
80%-9:43 AMWSW10:59 PMESE3:56 AMS234,045 mi
29
70%-10:43 AMWSW11:46 PMESE4:52 AMS232,423 mi
30
59%-11:41 AMWSW-5:44 AMS231,034 mi
31
50%12:30 AME12:37 PMW-6:33 AMS229,912 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 Siem Reap International Airport is essentially constant during May, remaining within 1% of 99% throughout.

For reference, on June 25, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 21, the least muggy day of the year, there are muggy conditions 54% of the time.

Humidity Comfort Levels in May at Siem Reap International Airport

Humidity Comfort Levels in May at Siem Reap International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AprJunMay 198%May 198%May 31100%May 31100%May 1199%May 1199%May 21100%May 21100%miserablemiserableoppressiveoppressivemuggymuggyhumidhumid
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 Siem Reap International Airport is increasing during May, increasing from 4.7 miles per hour to 5.7 miles per hour over the course of the month.

For reference, on August 5, the windiest day of the year, the daily average wind speed is 6.8 miles per hour, while on October 5, the calmest day of the year, the daily average wind speed is 4.5 miles per hour.

Average Wind Speed in May at Siem Reap International Airport

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 Siem Reap International Airport throughout May is predominantly from the west, with a peak proportion of 63% on May 31.

Wind Direction in May at Siem Reap International Airport

Wind Direction in May at Siem Reap International AirportSWMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%AprJunwestsoutheast
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).

Temperatures at Siem Reap International 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 May at Siem Reap International Airport

Time Spent in Various Temperature Bands and the Growing Season in May at Siem Reap International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJun100%May 16100%May 16warmhotsweltering
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 Siem Reap International Airport are very rapidly increasing during May, increasing by 1,008°F, from 3,769°F to 4,777°F, over the course of the month.

Growing Degree Days in May at Siem Reap International Airport

Growing Degree Days in May at Siem Reap International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031313,800°F3,800°F4,000°F4,000°F4,200°F4,200°F4,400°F4,400°F4,600°F4,600°F4,800°F4,800°FAprJunMay 13,769°FMay 13,769°FMay 314,777°FMay 314,777°FMay 114,108°FMay 114,108°FMay 214,442°FMay 214,442°F
The average growing degree days accumulated over the course of May, 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 Siem Reap International Airport is essentially constant during May, remaining within 0.2 kWh of 4.7 kWh throughout.

Average Daily Incident Shortwave Solar Energy in May at Siem Reap International Airport

Average Daily Incident Shortwave Solar Energy in May at Siem Reap International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhAprJunMay 14.8 kWhMay 14.8 kWhMay 314.5 kWhMay 314.5 kWhMay 114.7 kWhMay 114.7 kWhMay 214.6 kWhMay 214.6 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.

This report illustrates the typical weather at Siem Reap 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

Siem Reap 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.

There are no other weather stations in our network within 200 kilometers of this location. Consequently, in the case of missing or erroneous measurements from this station, we fall back on NASA's MERRA-2 modern-era reanalysis , adjusted according to typical seasonal and diurnal differences between this station and the wide-area MERRA-2 reconstructed values.

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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