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July Weather in Colombo Sri Lanka

Daily high temperatures are around 86°F, rarely falling below 84°F or exceeding 88°F. The lowest daily average high temperature is 86°F on July 29.

Daily low temperatures are around 80°F, rarely falling below 77°F or exceeding 82°F.

For reference, on April 1, the hottest day of the year, temperatures in Colombo typically range from 78°F to 90°F, while on January 12, the coldest day of the year, they range from 74°F to 88°F.

Average High and Low Temperature in July in Colombo

Average High and Low Temperature in July in ColomboJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313176°F76°F78°F78°F80°F80°F82°F82°F84°F84°F86°F86°F88°F88°F90°F90°F92°F92°F94°F94°F96°F96°F98°F98°F100°F100°F102°F102°FJunAugJul 2386°FJul 2386°F80°F80°FJul 187°FJul 187°F80°F80°FJul 3186°FJul 3186°F80°F80°FJul 1186°FJul 1186°F80°F80°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 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 in Colombo

Average Hourly Temperature in July in ColomboJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJunAugwarmwarmhot
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.

Santa Marta, Colombia (10,266 miles away) and São Luís, Maranhão, Brazil (8,591 miles) are the far-away foreign places with temperatures most similar to Colombo (view comparison).

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The month of July in Colombo experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 87% throughout the month. The highest chance of overcast or mostly cloudy conditions is 88% on July 21.

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

For reference, on July 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 88%, while on March 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 44%.

Cloud Cover Categories in July in Colombo

Cloud Cover Categories in July in ColomboJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugMar 444%Mar 444%Jul 114%Jul 114%Jul 3113%Jul 3113%Jul 1113%Jul 1113%Jul 2112%Jul 2112%partly cloudymostly cloudyovercastmostly clear
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. In Colombo, the chance of a wet day over the course of July is decreasing, starting the month at 35% and ending it at 29%.

For reference, the year's highest daily chance of a wet day is 70% on October 28, and its lowest chance is 19% on February 9.

Probability of Precipitation in July in Colombo

Probability of Precipitation in July in ColomboJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%55%55%60%60%JunAugJul 135%Jul 135%Jul 3129%Jul 3129%Jul 1133%Jul 1133%Jul 2130%Jul 2130%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 July in Colombo is decreasing, starting the month at 2.7 inches, when it rarely exceeds 5.2 inches or falls below 0.7 inches, and ending the month at 2.1 inches, when it rarely exceeds 4.6 inches or falls below 0.6 inches.

The lowest average 31-day accumulation is 2.1 inches on July 30.

Average Monthly Rainfall in July in Colombo

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 in Colombo, the length of the day is essentially constant. The shortest day of the month is July 31, with 12 hours, 25 minutes of daylight and the longest day is July 1, with 12 hours, 31 minutes of daylight.

Hours of Daylight and Twilight in July in Colombo

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 Colombo is 5:58 AM on July 1 and the latest sunrise is 5 minutes later at 6:04 AM on July 31.

The latest sunset is 6:31 PM on July 14 and the earliest sunset is 1 minute, 35 seconds earlier at 6:29 PM on July 31.

Daylight saving time is not observed in Colombo during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:56 AM and sets 12 hours, 32 minutes later, at 6:28 PM, while on December 21, the shortest day of the year, it rises at 6:17 AM and sets 11 hours, 43 minutes later, at 6:00 PM.

Sunrise & Sunset with Twilight in July in Colombo

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 in Colombo

Solar Elevation and Azimuth in July in ColomboJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJunAug00101020202030304040505050606070708000010102020303030404050506060607070
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 in Colombo

Moon Rise, Set & Phases in July in ColomboJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJunAugJun 66:08 PMJun 66:08 PMJun 226:39 AMJun 226:39 AMJul 64:28 AMJul 64:28 AMJul 213:48 PMJul 213:48 PMAug 44:44 PMAug 44:44 PMAug 1911:56 PMAug 1911:56 PM5:23 AM5:23 AM6:22 PM6:22 PM5:57 PM5:57 PM5:56 AM5:56 AM6:07 AM6:07 AM7:04 PM7:04 PM6:40 PM6:40 PM6:44 AM6:44 AM5:48 AM5:48 AM6:35 PM6:35 PM6:14 PM6:14 PM6:25 AM6:25 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
26%1:32 AMENE2:15 PMWNW-7:52 AMN231,617 mi
2
17%2:21 AMENE3:11 PMWNW-8:44 AMN232,955 mi
3
9%3:14 AMENE4:10 PMWNW-9:41 AMN234,616 mi
4
4%4:10 AMENE5:10 PMWNW-10:39 AMN236,595 mi
5
1%5:08 AMENE6:09 PMWNW-11:39 AMN238,850 mi
6
0%6:07 AMENE7:04 PMWNW-12:36 PMN241,294 mi
7
2%7:03 AMENE7:54 PMWNW-1:30 PMN243,795 mi
8
6%7:55 AMENE8:40 PMWNW-2:19 PMN246,188 mi
9
12%8:44 AMENE9:22 PMWNW-3:04 PMN248,294 mi
10
19%9:30 AMENE10:00 PMW-3:46 PMN249,939 mi
11
27%10:13 AME10:37 PMW-4:25 PMS250,965 mi
12
36%10:55 AME11:13 PMW-5:04 PMS251,253 mi
13
46%11:37 AME11:49 PMW-5:43 PMS250,730 mi
14
50%12:19 PMESE--6:23 PMS249,383 mi
15
65%-12:27 AMWSW1:05 PMESE7:06 PMS247,267 mi
16
75%-1:09 AMWSW1:53 PMESE7:53 PMS244,502 mi
17
83%-1:54 AMWSW2:46 PMESE8:44 PMS241,277 mi
18
91%-2:45 AMWSW3:42 PMESE9:41 PMS237,839 mi
19
96%-3:41 AMWSW4:42 PMESE10:41 PMS234,473 mi
20
99%-4:41 AMWSW5:42 PMESE11:43 PMS231,473 mi
21
100%-5:43 AMWSW6:40 PMESE--
22
100%-6:44 AMWSW7:35 PMESE12:43 AMS229,095 mi
23
97%-7:43 AMWSW8:26 PMESE1:40 AMS227,512 mi
24
92%-8:39 AMW9:14 PME2:34 AMS226,796 mi
25
84%-9:33 AMW9:59 PME3:24 AMS226,914 mi
26
74%-10:25 AMW10:44 PME4:12 AMS227,755 mi
27
63%-11:17 AMW11:30 PMENE5:00 AMN229,162 mi
28
50%-12:11 PMWNW-5:49 AMN230,968 mi
29
40%12:18 AMENE1:06 PMWNW-6:41 AMN233,024 mi
30
29%1:09 AMENE2:04 PMWNW-7:35 AMN235,215 mi
31
19%2:04 AMENE3:03 PMWNW-8:32 AMN237,466 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 Colombo is essentially constant during July, remaining around 100% throughout.

For reference, on April 7, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 28, the least muggy day of the year, there are muggy conditions 94% of the time.

Humidity Comfort Levels in July in Colombo

Humidity Comfort Levels in July in ColomboJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JunAugJul 1100%Jul 1100%Jul 31100%Jul 31100%Jul 11100%Jul 11100%Jul 21100%Jul 21100%miserablemiserableoppressiveoppressive
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 Colombo is essentially constant during July, remaining within 0.2 miles per hour of 13.4 miles per hour throughout.

For reference, on June 9, the windiest day of the year, the daily average wind speed is 14.1 miles per hour, while on March 14, the calmest day of the year, the daily average wind speed is 5.9 miles per hour.

Average Wind Speed in July in Colombo

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 Colombo throughout July is predominantly from the west, with a peak proportion of 98% on July 14.

Wind Direction in July in Colombo

Wind Direction in July in ColomboJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JunAugwest
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).

Colombo 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 Colombo is essentially constant during July, remaining around 81°F throughout.

Average Water Temperature in July in Colombo

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 Colombo 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 in Colombo

Time Spent in Various Temperature Bands and the Growing Season in July in ColomboJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%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 16100%Jul 2100%Jul 2warmhot
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 Colombo are very rapidly increasing during July, increasing by 979°F, from 5,857°F to 6,836°F, over the course of the month.

Growing Degree Days in July in Colombo

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 in Colombo is essentially constant during July, remaining around 4.6 kWh throughout.

Average Daily Incident Shortwave Solar Energy in July in Colombo

Average Daily Incident Shortwave Solar Energy in July in ColomboJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhJunAugJul 14.6 kWhJul 14.6 kWhJul 314.6 kWhJul 314.6 kWhJul 114.6 kWhJul 114.6 kWhJul 214.5 kWhJul 214.5 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 Colombo are 6.932 deg latitude, 79.848 deg longitude, and 30 ft elevation.

The topography within 2 miles of Colombo contains only modest variations in elevation, with a maximum elevation change of 102 feet and an average elevation above sea level of 20 feet. Within 10 miles also contains only modest variations in elevation (226 feet). Within 50 miles contains only modest variations in elevation (7,175 feet).

The area within 2 miles of Colombo is covered by artificial surfaces (55%) and water (45%), within 10 miles by water (56%) and artificial surfaces (34%), and within 50 miles by water (59%) and trees (19%).

This report illustrates the typical weather in Colombo, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Colombo.

For each station, the records are corrected for the elevation difference between that station and Colombo 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 Colombo is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Colombo 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 Colombo 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.

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