Istanbul Province · Turkey
Istanbul in September
In September, Istanbul averages a daytime high of 25 °C and a night-time low of 16 °C, with about 53 mm of rain over the month. By the measure used here it is one of the most comfortable months to visit; they run May to September.
- Average high
- 25 °C
- Average low
- 16 °C
- Rain in the month
- 53 mm
- Daylight on 15 Sep
- 12 h 20 min
- Comfortable month
- Yes
- Places to stay
- 823
When to go
How September compares with the rest of the year in Istanbul
September is the 4th warmest month in Istanbul by average daytime high; across the year the highs run from 9 °C to 29 °C and the lows from 3 °C to 20 °C. By day, September is 4 °C cooler than August, and October is 5 °C cooler than September.
September brings 53 mm of rain, less than the monthly average of 64 mm (763 mm a year); it is the 7th wettest month.
On 15 September the sun is up for about 12 h 20 min, against 9 h 10 min at the shortest and 15 h 10 min at the longest point of the year (calculated from the latitude, sunrise to sunset).
| Month | High | Low | Rain | Comfortable |
|---|---|---|---|---|
| January | 9 °C | 3 °C | 96 mm | |
| February | 10 °C | 3 °C | 74 mm | |
| March | 12 °C | 5 °C | 71 mm | |
| April | 16 °C | 8 °C | 50 mm | |
| May | 21 °C | 12 °C | 39 mm | Yes |
| June | 26 °C | 17 °C | 37 mm | Yes |
| July | 29 °C | 20 °C | 25 mm | Yes |
| August | 29 °C | 20 °C | 33 mm | Yes |
| September | 25 °C | 16 °C | 53 mm | Yes |
| October | 20 °C | 13 °C | 93 mm | |
| November | 15 °C | 8 °C | 90 mm | |
| December | 11 °C | 5 °C | 105 mm |
Comfortable means average daytime high between 18 °C and 29 °C and under 80 mm of rain in the month. Averages for 1991–2020 over the surrounding area, a grid square about 50 km across, so a coast or a nearby mountain can make the town itself warmer or cooler. Data: CRU TS v4.10, Climatic Research Unit, University of East Anglia (Open Database License).
When to go
Is September a good time to visit Istanbul?
Yes, by the measure used here: in September the average high of 25 °C is between 18 °C and 29 °C and the 53 mm of rain is under 80 mm. The comfortable months in Istanbul are May to September.
The measure is about weather for a city stay only; it says nothing about events, school holidays or prices.
When to go
Destinations near Istanbul that are comfortable in September
Within 300 km, nearest first, by the same measure.
Where to stay
Where to stay in Istanbul
This guide lists 823 places to stay in Istanbul: 3 chain properties with their details and own websites, and 820 hotels recorded in Wikidata. By straight-line distance from the centre: under 1 km, 148; 1–3 km, 455; 3–10 km, 181; 10 km or more, 39.
Sources: climate from CRU TS v4.10 (Climatic Research Unit, University of East Anglia; Open Database License), 1991–2020 averages; day length calculated from the latitude; places to stay from each operator's own public pages and Wikidata. How this guide is made.