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Summer Weather in Kathmandu Nepal

Daily high temperatures are around 83°F, rarely falling below 77°F or exceeding 89°F. The highest daily average high temperature is 84°F on June 11.

Daily low temperatures are around 67°F, rarely falling below 63°F or exceeding 71°F. The highest daily average low temperature is 69°F on July 6.

For reference, on June 11, the hottest day of the year, temperatures in Kathmandu typically range from 67°F to 84°F, while on January 7, the coldest day of the year, they range from 37°F to 64°F.

Average High and Low Temperature in the Summer in Kathmandu

Average High and Low Temperature in the Summer in KathmanduJunJulAug55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°FSpringFallJun 1184°FJun 1184°F67°F67°FAug 3182°FAug 3182°F68°F68°FJul 183°FJul 183°F69°F69°FAug 182°FAug 182°F69°F69°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 summer temperatures. 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 the Summer in Kathmandu

Average Hourly Temperature in the Summer in KathmanduJunJulAug12 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 AMSpringFallcoolcomfortablecomfortablewarmcool
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.

Córdoba, Argentina (10,604 miles away) and Wondai, Australia (5,790 miles) are the far-away foreign places with temperatures most similar to Kathmandu (view comparison).

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The summer in Kathmandu experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 15% to 72%. The highest chance of overcast or mostly cloudy conditions is 84% on August 4.

The clearest day of the summer is June 1, with clear, mostly clear, or partly cloudy conditions 85% of the time.

For reference, on August 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 84%, while on November 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 93%.

Cloud Cover Categories in the Summer in Kathmandu

Cloud Cover Categories in the Summer in KathmanduJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFallNov 493%Nov 493%Jun 185%Jun 185%Aug 3128%Aug 3128%Jul 137%Jul 137%Aug 116%Aug 116%clearmostly clearpartly cloudyovercast
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 Kathmandu, the chance of a wet day over the course of the summer is very rapidly increasing, starting the season at 33% and ending it at 55%.

For reference, the year's highest daily chance of a wet day is 63% on July 17, and its lowest chance is 1% on November 19.

Probability of Precipitation in the Summer in Kathmandu

Probability of Precipitation in the Summer in KathmanduJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%SpringFallJul 1763%Jul 1763%Jun 133%Jun 133%Aug 3155%Aug 3155%Jul 157%Jul 157%Aug 159%Aug 159%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 season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer in Kathmandu is very rapidly increasing, starting the season at 2.9 inches, when it rarely exceeds 6.4 inches or falls below 0.8 inches, and ending the season at 5.4 inches, when it rarely exceeds 9.8 inches or falls below 1.6 inches.

The highest average 31-day accumulation is 7.3 inches on July 17.

Average Monthly Rainfall in the Summer in Kathmandu

Average Monthly Rainfall in the Summer in KathmanduJunJulAug0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inSpringFallJul 177.3 inJul 177.3 inJun 12.9 inJun 12.9 inAug 315.4 inAug 315.4 inJul 16.4 inJul 16.4 inAug 16.9 inAug 16.9 in
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 the summer in Kathmandu, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 4 minutes, implying an average daily decrease of 42 seconds, and weekly decrease of 4 minutes, 55 seconds.

The shortest day of the summer is August 31, with 12 hours, 43 minutes of daylight and the longest day is June 21, with 13 hours, 54 minutes of daylight.

Hours of Daylight and Twilight in the Summer in Kathmandu

Hours of Daylight and Twilight in the Summer in KathmanduJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSpringFallJun 2113 hr, 54 minJun 2113 hr, 54 minnightnightdaydayAug 3112 hr, 43 minAug 3112 hr, 43 minAug 113 hr, 26 minAug 113 hr, 26 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 summer in Kathmandu is 5:07 AM on June 9 and the latest sunrise is 35 minutes later at 5:42 AM on August 31.

The latest sunset is 7:03 PM on July 1 and the earliest sunset is 38 minutes earlier at 6:25 PM on August 31.

Daylight saving time is not observed in Kathmandu during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:08 AM and sets 13 hours, 54 minutes later, at 7:02 PM, while on December 21, the shortest day of the year, it rises at 6:50 AM and sets 10 hours, 23 minutes later, at 5:13 PM.

Sunrise & Sunset with Twilight in the Summer in Kathmandu

Sunrise & Sunset with Twilight in the Summer in KathmanduJunJulAug12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSpringFall5:07 AM5:07 AMJun 96:58 PMJun 96:58 PM5:11 AM5:11 AMJul 17:03 PMJul 17:03 PM5:42 AM5:42 AMAug 316:25 PMAug 316:25 PM5:26 AM5:26 AMAug 16:52 PMAug 16:52 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the summer. 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 the Summer in Kathmandu

Solar Elevation and Azimuth in the Summer in KathmanduJunJulAug12 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 AMSpringFall001020203030405050606070800010102030304040506060707080
northeastsouthwest
Solar elevation and azimuth in the the summer of 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 the summer of 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 the Summer in Kathmandu

Moon Rise, Set & Phases in the Summer in KathmanduJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSpringFallMay 89:08 AMMay 89:08 AMMay 237:39 PMMay 237:39 PMJun 66:23 PMJun 66:23 PMJun 226:54 AMJun 226:54 AMJul 64:43 AMJul 64:43 AMJul 214:03 PMJul 214:03 PMAug 44:59 PMAug 44:59 PMAug 2012:11 AMAug 2012:11 AMSep 37:41 AMSep 37:41 AMSep 188:20 AMSep 188:20 AM5:06 AM5:06 AM7:08 PM7:08 PM6:50 PM6:50 PM5:19 AM5:19 AM7:04 PM7:04 PM6:42 PM6:42 PM4:55 AM4:55 AM5:08 AM5:08 AM7:44 PM7:44 PM7:17 PM7:17 PM5:56 AM5:56 AM7:04 PM7:04 PM6:36 PM6:36 PM5:54 AM5:54 AM6:39 PM6:39 PM5:43 PM5:43 PM5:46 AM5:46 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.

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 Kathmandu is very rapidly increasing during the summer, rising from 34% to 91% over the course of the season.

The highest chance of a muggy day during the summer is 97% on August 1.

For reference, on August 1, the muggiest day of the year, there are muggy conditions 97% of the time, while on November 26, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Summer in Kathmandu

Humidity Comfort Levels in the Summer in KathmanduJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SpringFallAug 197%Aug 197%Jun 134%Jun 134%Aug 3191%Aug 3191%Jul 188%Jul 188%oppressiveoppressivemuggymuggyhumidhumiddrydry
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 Kathmandu is decreasing during the summer, decreasing from 5.6 miles per hour to 4.3 miles per hour over the course of the season.

For reference, on April 12, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on December 1, the calmest day of the year, the daily average wind speed is 3.7 miles per hour.

Average Wind Speed in the Summer in Kathmandu

Average Wind Speed in the Summer in KathmanduJunJulAug0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mphSpringFallJun 15.6 mphJun 15.6 mphAug 314.3 mphAug 314.3 mphJul 15.2 mphJul 15.2 mphAug 14.8 mphAug 14.8 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 in Kathmandu throughout the summer is predominantly from the south, with a peak proportion of 72% on July 11.

Wind Direction in the Summer in Kathmandu

Wind Direction in the Summer in KathmanduJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%SpringFallsoutheastnorthwest
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).

While it does not do so every year, freezing temperatures are seen in Kathmandu over some winters. The day least likely to be in the growing season is January 10, with a 74% chance.

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Kathmandu

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Kathmandugrowing seasonJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFall100%Jul 17100%Jul 17coolcomfortablewarmhot
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 Kathmandu are very rapidly increasing during the summer, increasing by 2,228°F, from 1,919°F to 4,147°F, over the course of the season.

Growing Degree Days in the Summer in Kathmandu

Growing Degree Days in the Summer in KathmanduJunJulAug2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°F4,000°F4,000°FSpringFallJun 11,919°FJun 11,919°FAug 314,147°FAug 314,147°FJul 12,666°FJul 12,666°FAug 13,424°FAug 13,424°F
The average growing degree days accumulated over the course of the summer, 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 Kathmandu is very rapidly decreasing during the summer, falling by 2.2 kWh, from 7.4 kWh to 5.2 kWh, over the course of the season.

Average Daily Incident Shortwave Solar Energy in the Summer in Kathmandu

Average Daily Incident Shortwave Solar Energy in the Summer in KathmanduJunJulAug0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhSpringFallJun 17.4 kWhJun 17.4 kWhAug 315.2 kWhAug 315.2 kWhJul 15.9 kWhJul 15.9 kWhAug 15.5 kWhAug 15.5 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 Kathmandu are 27.702 deg latitude, 85.321 deg longitude, and 4,252 ft elevation.

The topography within 2 miles of Kathmandu contains only modest variations in elevation, with a maximum elevation change of 230 feet and an average elevation above sea level of 4,291 feet. Within 10 miles contains only modest variations in elevation (6,155 feet). Within 50 miles also contains extreme variations in elevation (24,052 feet).

The area within 2 miles of Kathmandu is covered by artificial surfaces (57%) and cropland (41%), within 10 miles by cropland (42%) and trees (36%), and within 50 miles by trees (50%) and cropland (29%).

This report illustrates the typical weather in Kathmandu, 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 is only a single weather station, Tribhuvan International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Kathmandu.

At a distance of 4 kilometers from Kathmandu, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

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

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

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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