Last updated: August 27, 2025
Istanbul experiences a vibrant August, characterized by warm temperatures that often peak at 34°C (93°F), with an inviting average of 25°C (77°F). The nights offer a refreshing escape, cooling down to a comfortable 19°C (66°F). Although the month welcomes about 18 mm (0.7 in) of rain, it typically only interrupts the summer sunshine for three days, allowing for plenty of outdoor enjoyment. With a moderate humidity level of 55%, visitors can relish in the city's stunning landscapes and rich culture while basking in the delightful warmth of the season.
In August, Istanbul basks in the height of summer warmth, where temperatures showcase a notable rise. With a minimum of 19°C (66°F) and a maximum soaring to 34°C (93°F), the city experiences an inviting average of 25°C (77°F). This month marks a peak in the annual temperature cycle, reflecting a progression from the cooler months of spring and early summer. The warmth of August encourages outdoor exploration, making it the perfect time for locals and visitors alike to enjoy the vibrant atmosphere of this historic city. As the summer gives way to fall, temperatures begin to moderate, but in August, Istanbul is undeniably alive with heat and energy.
In August, Istanbul experiences a significant dip in precipitation, receiving only 18 mm (0.7 in) of rain over an average of just 3 days. This stark contrast to the wetter months earlier in the year reflects the city's shift towards drier summer weather. Following the peak rainfall of 102 mm in January, the trend reveals a gradual decrease, culminating in August's sparse showers. As the summer heat prevails, residents and visitors alike can relish in the typically clear skies and warm temperatures, making it a popular time for outdoor activities in the vibrant city.
In August, Istanbul experiences a notable dip in humidity, averaging around 55%. This decrease marks a significant contrast to the higher humidity levels observed during the winter months, where figures hover between 84% and 83% from January to March. As the season progresses into summer, humidity steadily declines, reaching its lowest point in August after peaking at 63% in July. Following this dry spell, humidity begins to rise again in September, indicating a transition back to the more humid conditions characteristic of the fall months. Overall, August stands out as a brief respite from the pervasive moisture, offering residents and visitors alike a more comfortable climate to enjoy the city's vibrant summer allure.
In August, Istanbul experiences a UV Index of 9, categorizing it as very high, with a burn time of just 15 minutes. This level of exposure is consistent with the peak summer months, where the UV Index remains elevated. Following a trend from June and July, August continues to demand caution for sun-seekers, as skin can burn quickly under the intense sunlight. As daylight hours wane gradually into September, the UV Index will start to decline, but during this month, it's crucial for residents and visitors alike to protect their skin against potential damage. For more insights on sun exposure in Istanbul, check out Istanbul UV Index.
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In August, Istanbul basks in a delightful 399 hours of sunshine, marking a slight dip from the peak of 428 hours in July yet remaining vibrant enough to enjoy the city's breathtaking sights. This month falls at the heart of summer, where daylight lingers long into the evenings, offering residents and tourists alike ample opportunities to explore historic landmarks and savor outdoor cafes. The trend of increasing sunlight hours from the start of the year culminates in the summer months, with sunshine peaking in July. As autumn approaches in September, the hours gradually decline, revealing a captivating transition that reflects the city's diverse seasonal beauty.
When it comes to the likelihood of sunny weather in Istanbul during August, the prospects are particularly bright, boasting an impressive 82% chance of sunshine. This peak occurs following the steady climb of sunny days throughout the summer months—starting from 60% in June and escalating to 79% in July. By August, the favorable weather sets the stage for vibrant outdoor activities and beautiful strolls along the Bosphorus. As the season transitions into September, the chances of sun dip to 58%, reminding us that August is truly the pinnacle of summer sunshine in this enchanting city.
In August, Istanbul enjoys a delightful 13 hours of daylight, a perfect culmination of the summer's long, sunlit days. As the city transitions from the peak of June, which boasts 15 hours, daylight gradually begins to recede, a trend that continues into the fall months. This seasonal shift is marked by a steady decline—from 14 hours in July to 12 hours in September—as autumn approaches. The pattern is clear: Istanbul experiences its longest days in the summer, with daylight progressively shortening as the year winds down, signaling the changing of the seasons and inviting locals and visitors alike to savor the remaining summer light.
In August, Istanbul experiences a gentle breeze with an average wind speed of 4.4 m/s (10 mph), maintaining the same strength as the preceding month, July. As the city transitions through the summer months, the wind speeds show a marked decrease from the robust 4.8 m/s (11 mph) in January, gradually dipping to a low of 3.0 m/s (7 mph) in June. Interestingly, the winds pick up slightly towards fall, reaching 4.9 m/s (11 mph) in September. This pattern of gradually increasing wind speeds in the latter part of the year contrasts with the summer lull, hinting at the invigorating changes that autumn brings to Istanbul's vibrant atmosphere.
Weather in Istanbul varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Istanbul, focusing on differences in temperature, rainfall, humidity, and UV levels.
In August, the weather is typically warm with temperatures ranging from a minimum of 19°C (66°F) to a maximum of 34°C (93°F), averaging around 25°C (77°F). With only 18 mm (0.7 in) of precipitation over about 3 days, humidity levels are relatively moderate at 55%. In stark contrast, January brings much colder temperatures, with highs only reaching 16°C (62°F) and lows dropping to -3°C (27°F), averaging a chilly 7°C (45°F). This month experiences significantly higher rainfall, totaling 102 mm (4.0 in) over 13 days, accompanied by higher humidity levels at 84%. For a more detailed look at January weather, you can visit Istanbul weather in January.
August and February present striking contrasts in weather conditions. In August, temperatures are quite warm, with a minimum of 19°C (66°F) and an average of 25°C (77°F) that can peak at 34°C (93°F). This month sees relatively low precipitation, totaling just 18 mm (0.7 in) over about 3 days, accompanied by moderate humidity at 55%. In contrast, February experiences a much colder climate, with temperatures ranging from a minimum of -1°C (31°F) to a maximum of 17°C (62°F) and an average of 8°C (46°F). February is significantly wetter, with 66 mm (2.6 in) of precipitation spread over 12 days and higher humidity levels at 84%. For more details on February weather, you can check Istanbul weather in February.
August and March present contrasting weather patterns. In August, temperatures in the region range from a pleasant minimum of 19°C (66°F) to a sweltering maximum of 34°C (93°F), with an average of 25°C (77°F). The month sees relatively low precipitation, totaling 18 mm (0.7 in) over just 3 days, and humidity sits comfortably at 55%. In contrast, March experiences much cooler temperatures, with a minimum of -2°C (29°F) and a maximum of 18°C (65°F), averaging just 8°C (47°F). The month is notably wetter, accumulating 82 mm (3.2 in) of rainfall over 12 days, and the humidity level is significantly higher at 83%. For more detailed information on March weather, you can refer to Istanbul weather in March.
In comparing the weather between April and August, we see a stark contrast in temperatures and humidity levels. August boasts warmer conditions, with average temperatures ranging from a minimum of 19°C (66°F) to a maximum of 34°C (93°F), while April experiences cooler temperatures, peaking at 23°C (73°F) and dropping to as low as 4°C (40°F). Additionally, August has significantly less precipitation, with only 18 mm (0.7 in) across just three days, whereas April is much wetter, receiving 49 mm (1.9 in) over eight days. The humidity in April is notably higher at 76%, compared to August's 55%. For a more detailed look at April's weather, visit Istanbul weather in April.
The weather in August is notably warmer than in May, with average temperatures ranging from a minimum of 19°C (66°F) to a maximum of 34°C (93°F), while May sees cooler temperatures from 8°C (46°F) to 27°C (82°F) on average. August also experiences significantly lower precipitation, with only 18 mm (0.7 in) over just three days compared to May's 50 mm (2.0 in) spread over eight days. Additionally, August's relative humidity is lower at 55%, making it feel less muggy than May, which has a higher humidity level of 77%. For more details on the weather during this month, you can check Istanbul weather in May.
When comparing the weather in August and June, it's clear that August tends to be warmer and drier. August sees temperatures ranging from a minimum of 19°C (66°F) to a maximum of 34°C (93°F), with an average of 25°C (77°F) and relatively low precipitation of 18 mm (0.7 in) over just 3 days. In contrast, June has a more moderate climate, with temperatures varying from a minimum of 13°C (56°F) to a maximum of 30°C (86°F) and an average of 22°C (71°F). June also experiences higher rainfall, totaling 40 mm (1.6 in) over 7 days, along with a higher humidity level of 70%. For a more detailed look at June’s weather, you can visit Istanbul weather in June.
In comparing the weather of August and July, August tends to be slightly warmer, with average temperatures reaching 25°C (77°F) compared to July's 24°C (76°F). The maximum temperatures also show a slight increase, with August hitting 34°C (93°F) against July's 33°C (92°F). However, July exhibits higher precipitation levels, accumulating 53 mm (2.1 in) over 5 days, while August sees significantly less rain, totaling only 18 mm (0.7 in) over just 3 days. Additionally, humidity levels are higher in July at 63%, compared to 55% in August. For more details on July's climate, check out Istanbul weather in July.
August tends to be warmer than September, with average temperatures of 25°C (77°F) compared to 22°C (72°F) in September. The maximum temperature in August reaches 34°C (93°F), while September sees a slightly lower maximum of 32°C (90°F). Additionally, August experiences less precipitation, averaging 18 mm (0.7 in) over just 3 days, while September has a higher total of 36 mm (1.4 in) across 6 days. Humidity also increases slightly from 55% in August to 60% in September, making early autumn feel a bit more damp. For more details, check out Istanbul weather in September.
August and October present a stark contrast in weather. In August, temperatures range from a comfortable low of 19°C (66°F) to a scorching high of 34°C (93°F), with an average temperature of 25°C (77°F). The month sees minimal rainfall, with only 18 mm (0.7 in) over just three days and humidity at a moderate 55%. In contrast, October brings cooler temperatures, peaking at 28°C (82°F) and dipping to a low of 10°C (50°F), with an average of 18°C (64°F). This month experiences significantly more precipitation, totaling 56 mm (2.2 in) over eight days, along with increased humidity at 73%. For more detailed information, you can check Istanbul weather in October.
August and November present stark contrasts in weather conditions. In August, temperatures soar with a minimum of 19°C (66°F) and a maximum of 34°C (93°F), making it a hot month with relatively low precipitation of 18 mm (0.7 in) over just three days and moderate humidity at 55%. In contrast, November experiences much cooler temperatures, ranging from a minimum of 7°C (44°F) to a maximum of 22°C (72°F), with a significant increase in precipitation to 63 mm (2.5 in) spread over ten days and higher humidity levels at 82%. For more detailed information, you can check Istanbul weather in November.
August and December present stark contrasts in weather conditions. In August, temperatures are typically warmer, with daily averages around 25°C (77°F) and highs reaching up to 34°C (93°F), accompanied by relatively low precipitation of 18 mm over just 3 days. The humidity level sits at a moderate 55%, making the summer months feel quite warm and pleasant.
In contrast, December sees a significant drop in temperatures, with averages around 10°C (50°F) and maximums peaking at 18°C (64°F). Precipitation increases substantially to 108 mm, spread over 15 days, and the humidity rises to a notable 85%, resulting in a much chillier and wetter atmosphere. For a detailed look at the weather in December, you can check Istanbul weather in December.
As August settles over Istanbul, the city basks in warm temperatures that stand out from the cooler spring and fall months. With a maximum of 34°C (93°F) and an average of 25°C (77°F), this month is characterized by its heat, making it one of the hottest times of the year. Unlike the wetter months that follow, August experiences only a modest amount of rain, with just 18 mm falling over a few days, allowing for plenty of sunshine and outdoor activities. Humidity remains moderate at 55%, ensuring that while it feels warm, the temperatures are still manageable. For more detailed insights on what to expect throughout the year, explore Istanbul Climate.