Istanbul weather in October
In October, Istanbul has an average high of 20 °C68 °F and an average low of 14 °C58 °F, with about 70 mm2.7 in of precipitation. It is the 6th warmest month of the year and ranks 3rd for precipitation.
How October compares with other months
Compared with September, October is 4.9 °C8.9 °F cooler on average and wetter by 16 mm0.6 in. Compared with November, October is 4.7 °C8.4 °F warmer on average and wetter by 7 mm0.3 in. Daylight lasts about 11.0 hours around the middle of the month. Average relative humidity is 76% and the average cloud amount 59%.
Is October a good time to visit Istanbul?
Yes — October is one of the most comfortable months to visit Istanbul by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in October
For Istanbul in October, pack light layers — T-shirts plus a light sweater or jacket.
October in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Istanbul | 2068 | 1458 | 702.7 |
| Üsküdar | 2068 | 1458 | 702.7 |
| Ümraniye | 1966 | 1356 | 722.8 |
| Küçükçekmece | 2068 | 1457 | 702.7 |
| Maltepe | 1966 | 1356 | 722.8 |
| İzmit | 2169 | 1253 | 712.8 |
| Nilüfer | 2373 | 1253 | 672.6 |
| Bursa | 2272 | 1152 | 672.6 |
| Çorlu | 2068 | 1253 | 722.9 |
Nearby places that are more than 1 °C1.8 °F cooler: Çorlu.
Other months in Istanbul
- January8 °C47 °F / 4 °C38 °F
- February9 °C49 °F / 4 °C39 °F
- March12 °C53 °F / 6 °C42 °F
- April16 °C60 °F / 9 °C48 °F
- May21 °C70 °F / 14 °C57 °F
- June26 °C79 °F / 19 °C66 °F
- July29 °C84 °F / 22 °C71 °F
- August29 °C84 °F / 22 °C72 °F
- September25 °C77 °F / 19 °C66 °F
- October20 °C68 °F / 14 °C58 °F
- November15 °C59 °F / 10 °C50 °F
- December10 °C50 °F / 6 °C42 °F
Frequently asked questions
How warm is Istanbul in October?
In October the average high in Istanbul is 20 °C (68 °F) and the average low is 14 °C (58 °F).
Does it rain a lot in Istanbul in October?
On average about 70 mm (2.7 in) of precipitation falls in October; it ranks 3rd of the 12 months.
Is October the warmest month in Istanbul?
No. The warmest month in Istanbul is August, with an average high of 29 °C (84 °F). The coldest month is January, with an average low of 4 °C (38 °F).
How long is the day in Istanbul in October?
In the middle of October the day in Istanbul lasts about 11.0 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Istanbul in October?
The average relative humidity in October is about 76%. This is a long-term average for the whole day.
How cloudy is Istanbul in October?
On average about 59% of the sky is covered by cloud in October. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.