Istanbul weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Excellent
Best time to visit: May – September
What is the weather like in Istanbul in August?
In August, Istanbul is hot: daytime highs average 28 °C, and even at night it stays warm at around 22 °C. The sea averages 24.4 °C – pleasant for swimming. With around 9 hours of sunshine a day, there is plenty of sun. Rain is rare: about 3 days bring 21 mm in total. On about 6 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is an excellent month for a holiday in Istanbul.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 94 | 93 | 88 |
| Day | 28° | 28° | 24° |
| Night | 21° | 22° | 19° |
| Sea | 24° | 24° | 23° |
| Sun | 10 h | 9 h | 7 h |
| Rain days | 3 | 3 | 7 |
More details for August
- Daylight
- 13 h 52 min06:13 – 20:05
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 20 daysdew point 18 °C or more
- Wind
- 23 km/haverage daily peak
- Cloud cover
- 22 %on average
- Hot days
- 6 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+3Europe/Istanbul
How the score comes together
- Temperatureweight 50 %86 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
Istanbul in August: quick answers
Is Istanbul hot in August?
Yes. In August, Istanbul is hot: daytime highs average 28 °C and nights stay around 22 °C. On about 6 days the thermometer climbs to 30 °C or more.
Can you swim in Istanbul in August?
Yes. In August the sea averages 24.4 °C – pleasant for swimming.
Does it rain much in Istanbul in August?
Rain is rare: about 3 days bring 21 mm in total.
Istanbul month by month
The whole year in IstanbulAll destinations: TurkeyWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)