Istanbul weather in October
Temperature, sea and sunshine in October: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in October
Good
Best time to visit: May – September
What is the weather like in Istanbul in October?
In October, Istanbul is mild: daytime highs average 19 °C, and nights cool down to about 15 °C. The sea averages 19.2 °C – bracing, so a wetsuit helps for longer swims. Expect around 5 hours of sunshine a day. Rain falls on about 9 days, adding up to 73 mm. All in all, October is a good month for a holiday in Istanbul.
October compared
How the weather changes from September to November. Tap a month to open it.
| SeptemberSep | OctoberOct | NovemberNov | |
|---|---|---|---|
| Score | 88 | 77 | 57 |
| Day | 24° | 19° | 15° |
| Night | 19° | 15° | 11° |
| Sea | 23° | 19° | 16° |
| Sun | 7 h | 5 h | 4 h |
| Rain days | 7 | 9 | 9 |
More details for October
- Daylight
- 11 h 11 min07:14 – 18:25
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 21 km/haverage daily peak
- Cloud cover
- 50 %on average
- Hot days
- 0 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 %100 %
- Sunshineweight 20 %33 %
- Few rainy daysweight 30 %66 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Wetsuit for longer swims
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Istanbul in October: quick answers
Is Istanbul hot in October?
No. In October, Istanbul is mild: daytime highs average 19 °C and nights drop to about 15 °C.
Can you swim in Istanbul in October?
Only if you don't mind cold water: in October the sea averages just 19.2 °C. Comfortable swimming is possible from June to September.
Does it rain much in Istanbul in October?
Rain falls on about 9 days, adding up to 73 mm.
Istanbul month by month
The whole year in IstanbulAll destinations: TurkeyWhere to go in OctoberSea temperature in October
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)