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Summer Weather in İstanbul Turkey

Daily high temperatures increase by 5°F, from 75°F to 80°F, rarely falling below 68°F or exceeding 90°F. The highest daily average high temperature is 85°F on August 1.

Daily low temperatures increase by 6°F, from 61°F to 67°F, rarely falling below 56°F or exceeding 76°F. The highest daily average low temperature is 71°F on August 2.

For reference, on July 31, the hottest day of the year, temperatures in İstanbul typically range from 71°F to 85°F, while on February 6, the coldest day of the year, they range from 38°F to 47°F.

Average High and Low Temperature in the Summer in İstanbul

Average High and Low Temperature in the Summer in İstanbulJunJulAug45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°FSpringFallJul 3185°FJul 3185°F71°F71°FJun 175°FJun 175°F61°F61°FAug 3180°FAug 3180°F67°F67°FJul 182°FJul 182°F67°F67°FNowNow
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 İstanbul

Average Hourly Temperature in the Summer in İstanbulJunJulAug12 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 AMSpringFallNowNowcoolcoolcomfortablewarmcold
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.

Jeju City, South Korea (5,103 miles away); Matsue, Japan (5,300 miles); and Atami, Japan (5,568 miles) are the far-away foreign places with temperatures most similar to İstanbul (view comparison).

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Compare İstanbul to another city:

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The summer in İstanbul experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 28% to 12%. The lowest chance of overcast or mostly cloudy conditions is 4% on July 25.

The clearest day of the summer is July 25, with clear, mostly clear, or partly cloudy conditions 96% of the time.

For reference, on December 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 96%.

Cloud Cover Categories in the Summer in İstanbul

Cloud Cover Categories in the Summer in İstanbulJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFallDec 1342%Dec 1342%Jun 172%Jun 172%Aug 3188%Aug 3188%Jul 192%Jul 192%Aug 196%Aug 196%NowNowclearovercastmostly 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.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In İstanbul, the chance of a wet day over the course of the summer is decreasing, starting the season at 16% and ending it at 11%.

For reference, the year's highest daily chance of a wet day is 32% on December 12, and its lowest chance is 7% on July 11.

Probability of Precipitation in the Summer in İstanbul

Probability of Precipitation in the Summer in İstanbulJunJulAug0%0%2%2%4%4%6%6%8%8%10%10%12%12%14%14%16%16%18%18%20%20%SpringFallJul 117%Jul 117%Jun 116%Jun 116%Aug 3111%Aug 3111%Jul 110%Jul 110%Aug 18%Aug 18%NowNowrain
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 İstanbul is essentially constant, remaining about 0.8 inches throughout, and rarely exceeding 2.6 inches.

The lowest average 31-day accumulation is 0.6 inches on July 21.

Average Monthly Rainfall in the Summer in İstanbul

Average Monthly Rainfall in the Summer in İstanbulJunJulAug0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 in4.0 in4.0 inSpringFallJul 200.6 inJul 200.6 inJun 11.1 inJun 11.1 inAug 311.0 inAug 311.0 inJul 10.7 inJul 10.7 inAug 10.6 inAug 10.6 inNowNow
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 İstanbul, 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, 48 minutes, implying an average daily decrease of 1 minute, 11 seconds, and weekly decrease of 8 minutes, 20 seconds.

The shortest day of the summer is August 31, with 13 hours, 8 minutes of daylight and the longest day is June 21, with 15 hours, 8 minutes of daylight.

Hours of Daylight and Twilight in the Summer in İstanbul

Hours of Daylight and Twilight in the Summer in İstanbulJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSpringFallJun 2015 hr, 8 minJun 2015 hr, 8 minnightnightdaydayAug 3113 hr, 8 minAug 3113 hr, 8 minAug 114 hr, 20 minAug 114 hr, 20 minNowNow
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 İstanbul is 5:31 AM on June 14 and the latest sunrise is 59 minutes later at 6:30 AM on August 31.

The latest sunset is 8:40 PM on June 27 and the earliest sunset is 1 hour, 3 minutes earlier at 7:37 PM on August 31.

Daylight saving time is not observed in İstanbul during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:32 AM and sets 15 hours, 8 minutes later, at 8:39 PM, while on December 21, the shortest day of the year, it rises at 8:25 AM and sets 9 hours, 13 minutes later, at 5:39 PM.

Sunrise & Sunset with Twilight in the Summer in İstanbul

Sunrise & Sunset with Twilight in the Summer in İstanbulJunJulAug2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSpringFall5:31 AM5:31 AMJun 148:37 PMJun 148:37 PM6:30 AM6:30 AMAug 317:37 PMAug 317:37 PM5:35 AM5:35 AMJul 18:40 PMJul 18:40 PM6:00 AM6:00 AMAug 18:20 PMAug 18:20 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
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 İstanbul

Solar Elevation and Azimuth in the Summer in İstanbulJunJulAug12 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 AMSpringFall00102020303040505060607000101020303040405060NowNow
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 İstanbul

Moon Rise, Set & Phases in the Summer in İstanbulJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSpringFallMay 86:23 AMMay 86:23 AMMay 234:54 PMMay 234:54 PMJun 63:38 PMJun 63:38 PMJun 224:09 AMJun 224:09 AMJul 61:58 AMJul 61:58 AMJul 211:18 PMJul 211:18 PMAug 42:14 PMAug 42:14 PMAug 199:26 PMAug 199:26 PMSep 34:56 AMSep 34:56 AMSep 185:35 AMSep 185:35 AM5:43 AM5:43 AM8:56 PM8:56 PM8:41 PM8:41 PM5:44 AM5:44 AM9:02 PM9:02 PM8:39 PM8:39 PM5:17 AM5:17 AM5:32 AM5:32 AM9:34 PM9:34 PM9:03 PM9:03 PM6:32 AM6:32 AM8:41 PM8:41 PM8:06 PM8:06 PM6:45 AM6:45 AM6:37 AM6:37 AM7:52 PM7:52 PM6:58 PM6:58 PM6:54 AM6:54 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 İstanbul is very rapidly increasing during the summer, rising from 4% to 26% over the course of the season.

The highest chance of a muggy day during the summer is 48% on August 4.

For reference, on August 4, the muggiest day of the year, there are muggy conditions 48% of the time, while on November 19, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Summer in İstanbul

Humidity Comfort Levels in the Summer in İstanbulJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SpringFallAug 448%Aug 448%Jun 14%Jun 14%Aug 3126%Aug 3126%Jul 124%Jul 124%oppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
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 İstanbul is rapidly increasing during the summer, increasing from 8.6 miles per hour to 11.4 miles per hour over the course of the season.

For reference, on February 4, the windiest day of the year, the daily average wind speed is 11.9 miles per hour, while on May 30, the calmest day of the year, the daily average wind speed is 8.5 miles per hour.

The highest daily average wind speed during the summer is 11.8 miles per hour on August 13.

Average Wind Speed in the Summer in İstanbul

Average Wind Speed in the Summer in İstanbulJunJulAug0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mphSpringFallAug 1311.8 mphAug 1311.8 mphJun 18.6 mphJun 18.6 mphAug 3111.4 mphAug 3111.4 mphJul 19.8 mphJul 19.8 mphNowNow
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 İstanbul throughout the summer is predominantly from the north, with a peak proportion of 56% on July 27.

Wind Direction in the Summer in İstanbul

Wind Direction in the Summer in İstanbulNEJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%SpringFallNowNoweastnorthwestsouth
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).

İstanbul 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 İstanbul is rapidly increasing during the summer, rising by 9°F, from 66°F to 74°F, over the course of the season.

The highest average surface water temperature during the summer is 75°F on August 10.

Average Water Temperature in the Summer in İstanbul

Average Water Temperature in the Summer in İstanbulJunJulAug50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°FSpringFallAug 1075°FAug 1075°FJun 166°FJun 166°FAug 3174°FAug 3174°FJul 172°FJul 172°FNowNow
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).

The growing season in İstanbul typically lasts for 10 months (303 days), from around February 24 to around December 23, rarely starting after March 20, or ending before November 30.

The summer in İstanbul is reliably fully within the growing season.

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

Time Spent in Various Temperature Bands and the Growing Season in the Summer in İstanbulgrowing seasongrowing 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 17NowNowcoldcoolcomfortablewarmhot
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 İstanbul are very rapidly increasing during the summer, increasing by 2,238°F, from 694°F to 2,932°F, over the course of the season.

Growing Degree Days in the Summer in İstanbul

Growing Degree Days in the Summer in İstanbulJunJulAug1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°FSpringFallJun 1694°FJun 1694°FAug 312,932°FAug 312,932°FJul 11,343°FJul 11,343°FAug 12,153°FAug 12,153°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 İstanbul is decreasing during the summer, falling by 1.1 kWh, from 7.2 kWh to 6.1 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 7.9 kWh on July 6.

Average Daily Incident Shortwave Solar Energy in the Summer in İstanbul

Average Daily Incident Shortwave Solar Energy in the Summer in İstanbulJunJulAug0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhSpringFallJul 67.9 kWhJul 67.9 kWhJun 17.2 kWhJun 17.2 kWhAug 316.1 kWhAug 316.1 kWhAug 17.4 kWhAug 17.4 kWhNowNow
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 İstanbul are 41.014 deg latitude, 28.950 deg longitude, and 128 ft elevation.

The topography within 2 miles of İstanbul contains only modest variations in elevation, with a maximum elevation change of 322 feet and an average elevation above sea level of 90 feet. Within 10 miles contains only modest variations in elevation (932 feet). Within 50 miles contains very significant variations in elevation (4,301 feet).

The area within 2 miles of İstanbul is covered by artificial surfaces (69%) and water (22%), within 10 miles by artificial surfaces (47%) and water (36%), and within 50 miles by water (58%) and trees (22%).

This report illustrates the typical weather in İstanbul, 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 İstanbul.

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