Istanbul in October
In October, Istanbul has 75.8 mm (2.98 in) of rain, a daily high of 20.2 °C (68.4 °F) and a daily low of 14.2 °C (57.6 °F), as 1991-2020 model estimates; figures in brackets are converted. The daily high is a model estimate, adjusted against station records.
Last updated : back, with ERA5-Land model estimates.
Best time to visit Istanbul: October meets our rule. Expect 7.0 rain days (model estimate) and days that shorten by 1 h 18 min.
What October is like in Istanbul
- Filmekimi brings award-winning films from festivals around the world to Istanbul every October. They show at screens such as Kadıköy Cinema. Source: Daily Sabah, checked .
- The Atatürk Arboretum in Belgrad Forest draws its visitors mostly in autumn. They come to see its oaks, gathered from all around the world. Source: Go Türkiye (Türkiye Tourism Promotion and Development Agency), checked .
- Red deer, roe deer, squirrels and magpies live in the Polonezköy Nature Park. It is on one of the city's autumn walking routes. Source: Go Türkiye (Türkiye Tourism Promotion and Development Agency), checked .
Key figures
Weather in October, 1991-2020 model estimates
- Daily high
- 20.2 °C (68.4 °F)
- Daily low
- 14.2 °C (57.6 °F)
- Rain
- 75.8 mm (2.98 in) in the month
- Sunshine
- no data
Model estimate 1991-2020, not a weather station: ERA5-Land model estimates (Copernicus), computed by City by Month for the grid cell nearest the city. Daily high and Days with rain: model estimate, adjusted against station records. Licence: CC BY 4.0. Checked . How we make and test model estimates
Model estimate for the ERA5-Land grid cell at 41.0° N, 29.0° E, 4 km from the city centre point.
How we define and convert these figures
Notes. Sunshine: Not in our ERA5-Land estimates.
Daylight on 15 October 2026
- Sunrise
- 07:15 local time
- Sunset
- 18:24 local time
- Day length
- 11 h 08 min
Day length 1-31 October: 11 h 46 min to 10 h 28 min, -1 h 18 min.
Source: NOAA Solar Calculator equations, checked .
Month by month
Each month: daily high in °C, then rain in mm, 1991-2020 model estimates.
ERA5-Land model estimates 1991-2020, as above, checked .
This month against the year
| Measure | October | Rank |
|---|---|---|
| Daily high | 20.2 °C | 6th warmest |
| Daily low | 14.2 °C | 5th warmest |
| Rain | 75.8 mm | 3rd wettest |
| Sunshine | no data | no data |
| Day length | 11 h 08 min | 5th shortest |
Equal values share a rank. How we rank months
Istanbul in October, on average: 7.0 rain days (1 mm or more). Model estimate, adjusted against station records.
ERA5-Land model estimates 1991-2020, as above, checked .
Day length: NOAA solar equations, checked .
Public holidays this month
| Date | Holiday |
|---|---|
| Wednesday | Republic Day (from 1pm) |
| Thursday | Republic Day |
| Date | Holiday |
|---|---|
| Thursday | Republic Day (from 1pm) |
| Friday | Republic Day |
Typed from the official lists for 2026 and 2027 and re-checked, .
English names are from the holidays library where the official list gives none. How we check holidays
Source: Official public holiday list (vakithesaplama.diyanet.gov.tr) for 2026 and 2027, checked ; holidays Python library, checked . Library: holidays 0.105.
Same month in 8 model-estimate cities
Istanbul is warmer than 1 of our 8 model-estimate cities in October by mean daily high. How we rank cities
Closest high and low in October: Porto (1.1 °C apart), Sydney (1.4), Lisbon (2.1).
| City | Gap from Istanbul, °C | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|---|
| Istanbul (this page) | — | 20.2 | 14.2 | 75.8 | no data |
| Porto (closest) | 1.1 | 21.4 | 13.3 | 151.2 | no data |
| Sydney (closest) | 1.4 | 22.8 | 14.1 | 59.4 | no data |
| Lisbon (closest) | 2.1 | 22.5 | 16.1 | 79.7 | no data |
| Melbourne | 2.6 | 19.9 | 9.4 | 67.0 | no data |
| Delhi | 9.0 | 33.0 | 19.3 | no data | no data |
| Bangkok | 10.7 | 31.5 | 24.3 | no data | no data |
| Mumbai | 11.2 | 32.2 | 24.5 | no data | no data |
Sources (1991-2020): ERA5-Land model estimates, checked . Each city's page names its grid cell. All sources in full on Methodology.
Sources
- Attribution: Copernicus Climate Change Service (2025): ERA5 Land hourly time-series data from 1950 to present. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). DOI: 10.24381/ee82e357. Accessed on the check date shown. Generated using or contains modified Copernicus Climate Change Service information 2025. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains. Licence: CC BY 4.0. Checked .
- NOAA Solar Calculator equations, computed locally, NOAA Global Monitoring Laboratory (method); City by Month (computation). Attribution: Computed with the NOAA Solar Calculator method (no NOAA endorsement implied). Licence: Method, not data. Checked .
- holidays Python library, run locally. Attribution: holidays library, Vacanza team. Licence: MIT. Checked .
Official sources
Cite this page: City by Month. "Istanbul in October: weather, daylight, holidays". https://citybymonth.com/cities/turkey/istanbul/october/. Last updated 8 November 2026.