Istanbul Weather in September
24.8°C high · 15.9°C low · 41 mm rain · 8h sun
Sep is a warm month in Istanbul — not peak season, but a good time to avoid crowds.
September at a glance
| Metric | Value |
|---|---|
| Average high | 24.8°C |
| Average low | 15.9°C |
| Rainfall | 41 mm |
| Sunshine | 8 hours/day |
| Daylight | 12.3 hours |
What to pack in September
Pack comfortable clothes with a light layer for evenings for Istanbul in September.
Istanbul weather by month
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Frequently asked questions
What is the weather in Istanbul in September?
Highs of 24.8°C and lows of 15.9°C, with about 41 mm of rain and 8 hours of sunshine per day.
Is September a good time to visit Istanbul?
Sep is a warm month in Istanbul — not peak season, but a good time to avoid crowds.
What to do in Istanbul · Best time to visit Istanbul
Climate data: Open-Meteo Historical (ERA5), 1991–2020. CC BY 4.0.