Istanbul · Turkey
September
The shoulder sweet spot: summer conditions, crowds thinning, prices easing.
Best match
#3 of 12 months
September is one of the best times to visit Istanbul.
Climate
High
24.2°C
Low
16.5°C
Rain
33mm
Sun
9.5hrs/day
30-year climate normals · Open Meteo ERA5
How September scores in Istanbul
Weather
Outstanding
Value
Above average
Crowds
Above average
Events
Good
Atmosphere
Excellent
What you gain in September
- ↑24°C and still very little rain: September rivals May for ideal conditions
- ↑Sea temperature 24°C: Princes' Islands and Bosphorus swimming at their best
- ↑Istanbul Biennial (every two years) transforms the city's cultural landscape
What you sacrifice
- ↓Still moderately priced: not cheap yet, but the trend is downward
- ↓Cruise ships still active through September
- ↓First hints of autumn rain by the final week
How September compares to April (best month)
| Factor | September | April ★ |
|---|---|---|
| Weather | 9 | 8 |
| Value | 5 | 7 |
| Crowds | 5 | 6 |
September in other destinations
Climate data: 30-year normals (1991–2020) from Open Meteo ERA5 reanalysis. Scores compare months within Istanbul, not across destinations. Methodology →