July Weather in İstanbul Turkey

Daily high temperatures increase by 3°F, from 82°F to 85°F, rarely falling below 75°F or exceeding 90°F.

Daily low temperatures increase by 3°F, from 67°F to 71°F, rarely falling below 61°F or exceeding 76°F.

For reference, on August 1, 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.

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.

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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The month of July in İstanbul experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 8% to 4%. The lowest chance of overcast or mostly cloudy conditions is 4% on July 26.

The clearest day of the month is July 26, with clear, mostly clear, or partly cloudy conditions 96% of the time.

For reference, on December 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 96%.

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 July is gradually decreasing, starting the month at 10% and ending it at 7%.

For reference, the year's highest daily chance of a wet day is 32% on December 13, and its lowest chance is 7% on July 12.

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 İstanbul is essentially constant, remaining about 0.7 inches throughout, and rarely exceeding 1.9 inches.

The lowest average 31-day accumulation is 0.6 inches on July 22.

Over the course of July in İstanbul, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 42 minutes, implying an average daily decrease of 1 minute, 24 seconds, and weekly decrease of 9 minutes, 47 seconds.

The shortest day of the month is July 31, with 14 hours, 23 minutes of daylight and the longest day is July 1, with 15 hours, 5 minutes of daylight.

The earliest sunrise of the month in İstanbul is 5:35 AM on July 1 and the latest sunrise is 23 minutes later at 5:59 AM on July 31.

The latest sunset is 8:40 PM on July 1 and the earliest sunset is 19 minutes earlier at 8:21 PM on July 31.

Daylight saving time is not observed in İstanbul during 2026.

For reference, on June 21, 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 5:38 PM.

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.

The figure below presents a compact representation of key lunar data for July 2026. 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.

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 July, rising from 24% to 46% over the course of the month.

For reference, on August 5, the muggiest day of the year, there are muggy conditions 48% of the time, while on November 20, the least muggy day of the year, there are muggy conditions 0% of the time.

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 increasing during July, increasing from 9.7 miles per hour to 11.5 miles per hour over the course of the month.

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 31, the calmest day of the year, the daily average wind speed is 8.5 miles per hour.

The hourly average wind direction in İstanbul throughout July is predominantly from the north, with a peak proportion of 56% on July 28.

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 gradually increasing during July, rising by 3°F, from 72°F to 75°F, over the course of the month.

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 24, rarely starting after March 21, or ending before December 1.

The month of July in İstanbul is reliably fully 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 rapidly increasing during July, increasing by 783°F, from 1,343°F to 2,126°F, over the course of the month.

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 essentially constant during July, remaining within 0.2 kWh of 7.7 kWh throughout.

The highest average daily incident shortwave solar energy during July is 7.9 kWh on July 7.

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%).